{"id":57559,"date":"2025-08-15T15:10:19","date_gmt":"2025-08-15T07:10:19","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/57559.html"},"modified":"2025-08-15T15:10:19","modified_gmt":"2025-08-15T07:10:19","slug":"%e6%89%93%e5%8d%a1%e4%bf%a1%e5%a5%a5%e5%88%b7%e9%a2%98%ef%bc%881857%ef%bc%89%e7%94%a8c%e5%ae%9e%e7%8e%b0%e4%bf%a1%e5%a5%a5-p9460-%e3%80%8cezec-14%e3%80%8d%e4%bc%97%e6%95%b0-i","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/57559.html","title":{"rendered":"\u6253\u5361\u4fe1\u5965\u5237\u9898\uff081857\uff09\u7528C++\u5b9e\u73b0\u4fe1\u5965 P9460 \u300cEZEC-14\u300d\u4f17\u6570 I"},"content":{"rendered":"<h2>P9460 \u300cEZEC-14\u300d\u4f17\u6570 I<\/h2>\n<h3>\u9898\u76ee\u80cc\u666f<\/h3>\n<p>pigstd \u662f\u4e00\u4e2a\u53ef\u7231\u7684\u7537\u5b69\u5b50\u3002\u4ed6\u5728 NOI2022 \u4e2d\u7684\u4f17\u6570\u4e00\u9898\u5b9a\u4e49\u4e86 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">10610^6<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8141em\"><\/span><span class=\"mord\">1<\/span><span class=\"mord\"><span class=\"mord\">0<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">6<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> \u4e2a std::deque \u5e76\u6ca1\u6709 MLE\u3002<\/p>\n<h3>\u9898\u76ee\u63cf\u8ff0<\/h3>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u957f\u5ea6\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">nn<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">n<\/span><\/span><\/span><\/span><\/span> \u7684\u5e8f\u5217 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">aa<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">a<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u6211\u4eec\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u6784\u9020\u5e8f\u5217 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">bb<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\">b<\/span><\/span><\/span><\/span><\/span>&#xff1a;<\/p>\n<ul>\n<li>\u521d\u59cb\u65f6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">b&#061;ab&#061;a<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\">b<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">a<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<li>\u4f9d\u6b21\u5bf9 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">bb<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\">b<\/span><\/span><\/span><\/span><\/span> \u8fdb\u884c <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">kk<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0315em\">k<\/span><\/span><\/span><\/span><\/span> \u6b21\u64cd\u4f5c&#xff0c;\u6bcf\u6b21\u64cd\u4f5c\u9009\u62e9\u4efb\u610f\u4e00\u4e2a\u5143\u7d20\u5e76\u5c06\u5176\u4fee\u6539\u4e3a\u4efb\u610f\u6574\u6570\u3002<\/li>\n<\/ul>\n<p>dXqwq \u5b9a\u4e49\u4e00\u4e2a\u5e8f\u5217\u7684\u4f17\u6570\u4e3a\u6240\u6709\u51fa\u73b0\u6b21\u6570\u6700\u5927\u7684\u6570\u3002\u4f8b\u5982 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">[1,1,4,5,1,4][1,1,4,5,1,4]<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">[<\/span><span class=\"mord\">1<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">1<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">4<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">5<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">1<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">4<\/span><span class=\"mclose\">]<\/span><\/span><\/span><\/span><\/span> \u7684\u4f17\u6570\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">11<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u800c <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">[1,14,5,14,19,19,8,10][1,14,5,14,19,19,8,10]<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">[<\/span><span class=\"mord\">1<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">14<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">5<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">14<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">19<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">19<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">8<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">10<\/span><span class=\"mclose\">]<\/span><\/span><\/span><\/span><\/span> \u7684\u4f17\u6570\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">14,1914,19<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8389em;vertical-align: -0.1944em\"><\/span><span class=\"mord\">14<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">19<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<p>\u4f60\u9700\u8981\u6c42\u51fa\u6709\u591a\u5c11\u6574\u6570\u53ef\u80fd\u6210\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">bb<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\">b<\/span><\/span><\/span><\/span><\/span> \u7684\u4f17\u6570\u3002<\/p>\n<h3>\u8f93\u5165\u683c\u5f0f<\/h3>\n<p>\u7b2c\u4e00\u884c\u8f93\u5165\u4e24\u4e2a\u6574\u6570 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">n,kn,k<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8889em;vertical-align: -0.1944em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0315em\">k<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<p>\u7b2c\u4e8c\u884c\u8f93\u5165 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">nn<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">n<\/span><\/span><\/span><\/span><\/span> \u4e2a\u6574\u6570 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">aia_i<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.5806em;vertical-align: -0.15em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\">a<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.3117em\"><span class=\"\" style=\"top: -2.55em;margin-left: 0em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">i<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.15em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<h3>\u8f93\u51fa\u683c\u5f0f<\/h3>\n<p>\u8f93\u51fa\u4e00\u4e2a\u6574\u6570&#xff0c;\u4ee3\u8868\u53ef\u80fd\u6210\u4e3a\u4f17\u6570\u7684\u6570\u7684\u6570\u91cf\u3002<\/p>\n<p>\u7279\u522b\u5730&#xff0c;\u5982\u679c\u7b54\u6848\u4e3a\u6b63\u65e0\u7a77&#xff0c;\u8f93\u51fa pigstd\u3002<\/p>\n<h3>\u8f93\u5165\u8f93\u51fa\u6837\u4f8b #1<\/h3>\n<h4>\u8f93\u5165 #1<\/h4>\n<p>5 0<br \/>\n1 2 3 4 5<\/p>\n<h4>\u8f93\u51fa #1<\/h4>\n<p>5<\/p>\n<h3>\u8f93\u5165\u8f93\u51fa\u6837\u4f8b #2<\/h3>\n<h4>\u8f93\u5165 #2<\/h4>\n<p>5 1<br \/>\n1 2 3 4 5<\/p>\n<h4>\u8f93\u51fa #2<\/h4>\n<p>pigstd<\/p>\n<h3>\u8f93\u5165\u8f93\u51fa\u6837\u4f8b #3<\/h3>\n<h4>\u8f93\u5165 #3<\/h4>\n<p>5 1<br \/>\n1 1 2 2 3<\/p>\n<h4>\u8f93\u51fa #3<\/h4>\n<p>3<\/p>\n<h3>\u8bf4\u660e\/\u63d0\u793a<\/h3>\n<p>\u3010\u6837\u4f8b\u89e3\u91ca\u3011<\/p>\n<p>\u5bf9\u4e8e\u7b2c\u4e00\u7ec4\u6570\u636e&#xff0c;\u6700\u7ec8 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">1,2,3,4,51,2,3,4,5<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8389em;vertical-align: -0.1944em\"><\/span><span class=\"mord\">1<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">2<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">3<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">4<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">5<\/span><\/span><\/span><\/span><\/span> \u53ef\u80fd\u4e3a\u533a\u95f4\u4f17\u6570\u3002<\/p>\n<p>\u5bf9\u4e8e\u7b2c\u4e8c\u7ec4\u6570\u636e&#xff0c;\u5c06\u7b2c\u4e00\u4e2a\u6570\u6362\u6210 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">6,7,8,9,\u22ef6,7,8,9,\\\\cdots<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8389em;vertical-align: -0.1944em\"><\/span><span class=\"mord\">6<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">7<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">8<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">9<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"minner\">\u22ef<\/span><\/span><\/span><\/span><\/span> \u540e\u5b83\u4eec\u5747\u4f1a\u6210\u4e3a\u533a\u95f4\u4f17\u6570&#xff0c;\u56e0\u6b64\u7b54\u6848\u4e3a\u6b63\u65e0\u7a77\u3002<\/p>\n<p>\u5bf9\u4e8e\u7b2c\u4e09\u7ec4\u6570\u636e&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">1,2,31,2,3<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8389em;vertical-align: -0.1944em\"><\/span><span class=\"mord\">1<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">2<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">3<\/span><\/span><\/span><\/span><\/span> \u53ef\u80fd\u6210\u4e3a\u533a\u95f4\u4f17\u6570\u3002<\/p>\n<p>\u3010\u63d0\u793a\u3011<\/p>\n<p>\u5f00 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">10610^6<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8141em\"><\/span><span class=\"mord\">1<\/span><span class=\"mord\"><span class=\"mord\">0<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">6<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> \u4e2a std::deque \u5728\u7a7a\u95f4\u9650\u5236\u4e3a 1024MB \u65f6\u4e0d\u4e00\u5b9a\u4f1a MLE\u3002<\/p>\n<p>\u3010\u6570\u636e\u8303\u56f4\u3011<\/p>\n<p>\u672c\u9898\u91c7\u7528\u6346\u7ed1\u6d4b\u8bd5\u3002<\/p>\n<ul>\n<li>Subtask 1&#xff08;20 pts&#xff09;&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">n\u22645n\\\\leq 5<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7719em;vertical-align: -0.136em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">5<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<li>Subtask 2&#xff08;20 pts&#xff09;&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">n\u2264103n\\\\leq 10^3<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7719em;vertical-align: -0.136em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8141em\"><\/span><span class=\"mord\">1<\/span><span class=\"mord\"><span class=\"mord\">0<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">3<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<li>Subtask 3&#xff08;20 pts&#xff09;&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">k&#061;0k&#061;0<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0315em\">k<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">0<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<li>Subtask 4&#xff08;20 pts&#xff09;&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">k&#061;1k&#061;1<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0315em\">k<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<li>Subtask 5&#xff08;20 pts&#xff09;&#xff1a;\u65e0\u7279\u6b8a\u9650\u5236\u3002<\/li>\n<\/ul>\n<p>\u5bf9\u4e8e <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">100%100\\\\%<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8056em;vertical-align: -0.0556em\"><\/span><span class=\"mord\">100%<\/span><\/span><\/span><\/span><\/span> \u7684\u6570\u636e&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">1\u2264n\u22641061\\\\leq n\\\\leq 10^6<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7804em;vertical-align: -0.136em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7719em;vertical-align: -0.136em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8141em\"><\/span><span class=\"mord\">1<\/span><span class=\"mord\"><span class=\"mord\">0<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">6<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;$0\\\\leq k\\\\leq n $&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">1\u2264ai\u2264n1\\\\leq a_i\\\\leq n<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7804em;vertical-align: -0.136em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.786em;vertical-align: -0.15em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\">a<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.3117em\"><span class=\"\" style=\"top: -2.55em;margin-left: 0em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">i<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.15em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">n<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<h3>C&#043;&#043;\u5b9e\u73b0<\/h3>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;bits\/stdc&#043;&#043;.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">inline<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> s<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>w<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">char<\/span> ch<span class=\"token operator\">&#061;<\/span><span class=\"token function\">getchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>ch<span class=\"token operator\">&lt;<\/span><span class=\"token char\">&#039;0&#039;<\/span><span class=\"token operator\">||<\/span>ch<span class=\"token operator\">&gt;<\/span><span class=\"token char\">&#039;9&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ch<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token char\">&#039;-&#039;<\/span><span class=\"token punctuation\">)<\/span>w<span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>ch<span class=\"token operator\">&#061;<\/span><span class=\"token function\">getchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">}<\/span><br \/>\n   <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>ch<span class=\"token operator\">&gt;&#061;<\/span><span class=\"token char\">&#039;0&#039;<\/span><span class=\"token operator\">&amp;&amp;<\/span>ch<span class=\"token operator\">&lt;&#061;<\/span><span class=\"token char\">&#039;9&#039;<\/span><span class=\"token punctuation\">)<\/span> s<span class=\"token operator\">&#061;<\/span>s<span class=\"token operator\">*<\/span><span class=\"token number\">10<\/span><span class=\"token operator\">&#043;<\/span>ch<span class=\"token operator\">&#8211;<\/span><span class=\"token char\">&#039;0&#039;<\/span><span class=\"token punctuation\">,<\/span>ch<span class=\"token operator\">&#061;<\/span><span class=\"token function\">getchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">return<\/span> s<span class=\"token operator\">*<\/span>w<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">2000003<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>c<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000003<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">signed<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>k<span class=\"token operator\">&#061;<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>ans<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> T<span class=\"token operator\">&#061;<\/span>n<span class=\"token punctuation\">;<\/span> T<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>c<span class=\"token punctuation\">[<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&lt;&#061;<\/span>n<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;&#043;<\/span>a<span class=\"token punctuation\">[<\/span>c<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">&#061;<\/span>n<span class=\"token operator\">&#043;<\/span>k<span class=\"token punctuation\">,<\/span>c<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>s<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&gt;&#061;<\/span>k<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#8212;<\/span>i<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\ns<span class=\"token operator\">&#043;&#061;<\/span>c<span class=\"token punctuation\">,<\/span>c<span class=\"token operator\">&#043;&#061;<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token operator\">&gt;<\/span>k<span class=\"token punctuation\">)<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>ans<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nans<span class=\"token operator\">&#043;&#061;<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token operator\">&#8211;<\/span>k<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">puts<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;pigstd&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815071017-689edd5908eb4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" 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