{"id":76191,"date":"2026-02-21T22:49:10","date_gmt":"2026-02-21T14:49:10","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76191.html"},"modified":"2026-02-21T22:49:10","modified_gmt":"2026-02-21T14:49:10","slug":"hj90-%e5%90%88%e6%b3%95ip","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76191.html","title":{"rendered":"HJ90 \u5408\u6cd5IP"},"content":{"rendered":"<p>\u77e5\u8bc6\u70b92021\u5b57\u7b26\u4e32\u6808\u961f\u5217\u5b89\u5168\u5de5\u7a0b\u5e08\u5c0f\u7c73\u96c6\u56e2\u94fe\u8868<\/p>\n<h3>\u63cf\u8ff0<\/h3>\n<p>IPV4\u5730\u5740\u53ef\u4ee5\u7528\u4e00\u4e2a32\u4f4d\u65e0\u7b26\u53f7\u6574\u6570\u6765\u8868\u793a&#xff0c;\u4e00\u822c\u7528\u70b9\u5206\u65b9\u5f0f\u6765\u663e\u793a&#xff0c;\u70b9\u5c06IP\u5730\u5740\u5206\u62104\u4e2a\u90e8\u5206&#xff0c;\u6bcf\u4e2a\u90e8\u5206\u4e3a8\u4f4d&#xff0c;\u8868\u793a\u6210\u4e00\u4e2a\u65e0\u7b26\u53f7\u6574\u6570&#xff08;\u56e0\u6b64\u6b63\u53f7\u4e0d\u9700\u8981\u51fa\u73b0&#xff09;&#xff0c;\u598210.137.17.1&#xff0c;\u662f\u6211\u4eec\u975e\u5e38\u719f\u6089\u7684IP\u5730\u5740&#xff0c;\u4e00\u4e2aIP\u5730\u5740\u4e32\u4e2d\u6ca1\u6709\u7a7a\u683c\u51fa\u73b0&#xff08;\u56e0\u4e3a\u8981\u8868\u793a\u6210\u4e00\u4e2a32\u6570\u5b57&#xff09;\u3002<\/p>\n<p>\u73b0\u5728\u9700\u8981\u4f60\u7528\u7a0b\u5e8f\u6765\u5224\u65adIP\u662f\u5426\u5408\u6cd5\u3002<\/p>\n<p>\u6570\u636e\u8303\u56f4&#xff1a;\u6570\u636e\u7ec4\u6570&#xff1a;1\u2264t\u226418\u00a01\u2264t\u226418\u00a0<\/p>\n<p>\u8fdb\u9636&#xff1a;\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;O(n)\u00a0O(n)\u00a0&#xff0c;\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;O(n)\u00a0O(n)\u00a0<\/p>\n<p>\u8f93\u5165\u63cf\u8ff0&#xff1a;<\/p>\n<p>\u8f93\u5165\u4e00\u4e2aip\u5730\u5740&#xff0c;\u4fdd\u8bc1\u4e0d\u5305\u542b\u7a7a\u683c<\/p>\n<h4>\u8f93\u51fa\u63cf\u8ff0&#xff1a;<\/h4>\n<p>\u8fd4\u56de\u5224\u65ad\u7684\u7ed3\u679cYES\u00a0or\u00a0NO<\/p>\n<h3>\u793a\u4f8b1<\/h3>\n<p>\u8f93\u5165&#xff1a;<\/p>\n<p>255.255.255.1000<\/p>\n<p>\u590d\u5236\u8f93\u51fa&#xff1a;<\/p>\n<p>NO <\/p>\n<p>cc\u65b9\u6cd500&#xff1a;\u66b4\u529b\u679a\u4e3e<\/p>\n<p>\/hj090_legal_ip_00_vio_00.cc<\/p>\n<p>\/\/ \u66b4\u529b\u679a\u4e3e<br \/>\n#include &lt;iostream&gt;<br \/>\n#include &lt;vector&gt;<\/p>\n<p>using namespace std;<\/p>\n<p>bool check(const string &amp; s)<br \/>\n{<br \/>\n    vector&lt;string&gt; strs(0);<br \/>\n    string tmp &#061; &#034;&#034;;<br \/>\n    \/\/ \u6839\u636e\u5206\u9694\u7b26&#039;.&#039;\u5c06\u6bcf\u4e2a\u5b50\u6bb5\u5207\u5206\u5e76\u7f13\u5b58<br \/>\n    for (int i &#061; 0; i &lt; s.size(); &#043;&#043;i) {<br \/>\n        if (s[i] !&#061; &#039;.&#039;) {<br \/>\n            tmp.push_back(s[i]);<br \/>\n        } else {<br \/>\n            strs.push_back(tmp);<br \/>\n            tmp.clear();<br \/>\n        }<br \/>\n    }<br \/>\n    strs.push_back(tmp); \/\/ \u6700\u540e\u4e00\u4e2a.\u540e\u8fb9\u7684\u6700\u540e\u4e00\u6bb5\u5b50\u4e32<br \/>\n    \/\/ \u5982\u679c\u89e3\u6790\u7ed3\u679c\u4e0d\u662f4\u4e2a\u5b50\u6bb5&#xff0c;\u90a3\u5c31\u4e0d\u662f\u5408\u6cd5ip<br \/>\n    if (strs.size() !&#061; 4) {<br \/>\n        return false;<br \/>\n    }<br \/>\n    for (const string &amp; subStr : strs) {<br \/>\n        if (subStr &#061;&#061; &#034;&#034;) {<br \/>\n            return false; \/\/ \u907f\u514d\u51fa\u73b0\u7a7a\u7684\u5b50\u6bb5(\u5982.1.2.3)<br \/>\n        }<br \/>\n        \/\/ \u907f\u514d\u51fa\u73b00\u5f00\u5934\u7684\u5b50\u6bb5(\u598201.2.3.8)<br \/>\n        if (subStr.size() &gt; 1 &amp;&amp; subStr[0] &#061;&#061; &#039;0&#039;) {<br \/>\n            return false;<br \/>\n        }<br \/>\n        \/\/ \u8ba1\u7b97\u5b50\u6bb5\u7ed3\u679c\u524d\u5148\u6dfb\u52a0\u7b2c\u4e00\u4e2a\u5b57\u7b26<br \/>\n        if (subStr[0] &#8211; &#039;0&#039; &lt; 0 || subStr[0] &#8211; &#039;0&#039; &gt; 9) {<br \/>\n            return false;<br \/>\n        }<br \/>\n        int sum &#061; subStr[0] &#8211; &#039;0&#039;;<br \/>\n        for (int i &#061; 1; i &lt; subStr.size(); &#043;&#043;i) {<br \/>\n            sum &#061; sum * 10 &#043; (subStr[i] &#8211; &#039;0&#039;);<br \/>\n        }<br \/>\n        if (sum &gt; 255 || sum &lt; 0) {<br \/>\n            return false;<br \/>\n        }<br \/>\n    }<\/p>\n<p>    return true;<br \/>\n}<\/p>\n<p>int main()<br \/>\n{<br \/>\n    string s;<br \/>\n    while (getline(cin, s)) {<br \/>\n        cout &lt;&lt; (check(s) ? &#034;YES&#034; : &#034;NO&#034;) &lt;&lt; endl;<br \/>\n    }<\/p>\n<p>    return 0;<br \/>\n}<\/p>\n<p>cc\u65b9\u6cd501&#xff1a;stl&#xff0c;inet_pton\u51fd\u6570\u5224\u65ad\u662f\u5426\u4e3a\u5408\u6cd5ip<\/p>\n<p>\/\/ stl&#xff0c;inet_pton\u51fd\u6570\u5224\u65ad\u662f\u5426\u4e3a\u5408\u6cd5ip<br \/>\n#include &lt;iostream&gt;<br \/>\n#include &lt;vector&gt;<br \/>\n#include &lt;arpa\/inet.h&gt;<\/p>\n<p>using namespace std;<\/p>\n<p>bool check(const string &amp; s)<br \/>\n{<br \/>\n    sockaddr_in sa;<br \/>\n    \/\/ inet_pton\u8fd9\u4e2a\u51fd\u6570\u5728\u6210\u529f\u65f6\u8fd4\u56de1&#xff0c;\u5931\u8d25\u65f6\u8fd4\u56de0<br \/>\n    return inet_pton(AF_INET, s.c_str(), &amp;(sa.sin_addr));<br \/>\n}<\/p>\n<p>int main()<br \/>\n{<br \/>\n    string s &#061; &#034;&#034;;<br \/>\n    while (getline(cin, s)) {<br \/>\n        cout &lt;&lt; (check(s) ? &#034;YES&#034; : &#034;NO&#034;) &lt;&lt; endl;<br \/>\n    }<\/p>\n<p>    return 0;<br \/>\n} <\/p>\n<p>cc\u65b9\u6cd502&#xff1a;stl&#xff0c;stringstream<\/p>\n<p>\/hj090_legal_ip_01_stl_01.cc<\/p>\n<p>\/\/ stl&#xff0c;stringstream<br \/>\n#include &lt;iostream&gt;<br \/>\n#include &lt;vector&gt;<br \/>\n#include &lt;sstream&gt;<\/p>\n<p>using namespace std;<\/p>\n<p>bool check(const string &amp; s)<br \/>\n{<br \/>\n    \/\/ &#096;stringstream&#096; \u63d0\u4f9b\u5185\u5b58\u4e2d\u7684\u5b57\u7b26\u4e32\u6d41\u5904\u7406\u80fd\u529b&#xff0c;\u5141\u8bb8\u50cf\u64cd\u4f5c\u6587\u4ef6\u6d41\u4e00\u6837\u64cd\u4f5c\u5b57\u7b26\u4e32\u3002<br \/>\n    \/\/ \u652f\u6301\u8f93\u5165&#xff08;\u4ece\u5b57\u7b26\u4e32\u8bfb\u53d6&#xff09;\u548c\u8f93\u51fa&#xff08;\u5411\u5b57\u7b26\u4e32\u5199\u5165&#xff09;&#xff0c;\u4f7f\u7528 &#096;&lt;&lt;&#096; \u548c &#096;&gt;&gt;&#096; \u64cd\u4f5c\u7b26\u8fdb\u884c\u8bfb\u5199<br \/>\n    \/\/ \u53ef\u4ee5\u81ea\u52a8\u5904\u7406\u5b57\u7b26\u4e32\u4e0e\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e4b\u95f4\u7684\u8f6c\u6362<br \/>\n    \/\/ \u5b57\u7b26\u4e32\u6d41\u5bf9\u8c61 &#096;ss&#096; \u8c03\u7528\u6784\u9020\u51fd\u6570\u7528\u5b57\u7b26\u4e32 &#096;s&#096;, \u6b64\u65f6 &#096;ss&#096; \u7684\u5185\u5bb9\u4e0e &#096;s&#096; \u5b8c\u5168\u4e00\u81f4\u3002<br \/>\n    stringstream ss(s);<br \/>\n    string tmp;<br \/>\n    int cnt &#061; 0;<br \/>\n    \/\/ getline(ss, tmp, &#039;.&#039;)\u8868\u793a\u4ece &#096;ss&#096; \u4e2d\u8bfb\u53d6\u5b57\u7b26&#xff0c;\u5c06\u8bfb\u53d6\u7684\u5b57\u7b26\u5b58\u5165 &#096;tmp&#096;<br \/>\n    \/\/ \u5f53\u9047\u5230 &#096;.&#096; \u5b57\u7b26\u65f6\u505c\u6b62\u8bfb\u53d6&#xff0c;- \u4e22\u5f03\u5206\u9694\u7b26 &#096;.&#096;&#xff08;\u4e0d\u5b58\u5165 &#096;tmp&#096;&#xff09;- \u8fd4\u56de &#096;true&#096; \u8868\u793a\u6210\u529f\u8bfb\u53d6\u4e00\u6bb5<br \/>\n    \/\/ 1. \u5f53\u9047\u5230\u6d41\u672b\u5c3e&#xff08;\u65e0\u5206\u9694\u7b26&#039;.&#039;&#xff09;\u65f6,&#096;getline&#096; \u4f1a\u8bfb\u53d6\u4ece\u5f53\u524d\u4f4d\u7f6e\u5230\u6d41\u7ed3\u675f\u7684\u6240\u6709\u5b57\u7b26<br \/>\n    \/\/    &#8211; \u5c06\u8bfb\u53d6\u7684\u5185\u5bb9\u5b58\u5165 &#096;tmp&#096;,\u4e0d\u89e6\u53d1\u5931\u8d25\u72b6\u6001**&#xff08;\u4ecd\u8fd4\u56detrue&#xff09;,\u6d41\u72b6\u6001\u53d8\u4e3a &#096;eof&#096;&#xff08;\u7ed3\u675f\u72b6\u6001&#xff09;<br \/>\n    \/\/ 2. \u540e\u7eed\u64cd\u4f5c&#xff1a; -\u4e0b\u4e00\u6b21\u8c03\u7528 &#096;getline&#096; \u65f6&#xff0c;\u7531\u4e8e\u6d41\u5df2\u7ed3\u675f- \u76f4\u63a5\u8fd4\u56de &#096;false&#096;&#xff0c;\u7ec8\u6b62\u5faa\u73af<br \/>\n    while (getline(ss, tmp, &#039;.&#039;)) {<br \/>\n        \/\/ int atoi(const char *str);\u662f\u4e00\u4e2aC\u6807\u51c6\u5e93\u51fd\u6570&#xff0c;\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570<br \/>\n        \/\/ c_str()\u51fd\u6570\u200c\u662fstring\u7c7b\u7684\u6210\u5458\u51fd\u6570&#xff0c;\u7528\u4e8e\u8fd4\u56de\u4e00\u4e2a\u6307\u5411\u5b57\u7b26\u4e32\u5185\u90e8\u5b57\u7b26\u6570\u7ec4\u7684\u6307\u9488&#xff08;\u4ee5null\u7ed3\u5c3e\u7684C\u98ce\u683c\u5b57\u7b26\u4e32&#xff09;<br \/>\n        int num &#061; atoi(tmp.c_str());<br \/>\n        \/\/ \u6bcf\u4e00\u4e2a\u5b50\u6bb5\u53ea\u80fd\u662f\u6570\u5b57\u4e0d\u80fd\u6709\u5176\u4ed6\u7b26\u53f7, tmp[0]\u5fc5\u987b\u662f\u6570\u5b57&#xff0c;\u4e0d\u80fd\u4e3a\u7a7a\u6216\u5176\u4ed6<br \/>\n        if ((num !&#061; 0 &amp;&amp; tmp[0] &#061;&#061; &#039;0&#039;) || !isdigit(tmp[0])) {<br \/>\n            return false;<br \/>\n        } else if (num &lt; 0 || num &gt; 255) {<br \/>\n            return false;<br \/>\n        } else {<br \/>\n            cnt&#043;&#043;;<br \/>\n        }<br \/>\n    }<br \/>\n    \/\/ \u68c0\u6d4b\u52304\u4e2a\u5b50\u6bb5\u4e14\u6bcf\u4e2a\u5b50\u6bb5\u90fd\u662f\u5408\u6cd5\u7684\u6570\u5b57<br \/>\n    if (cnt !&#061; 4) {<br \/>\n        return false;<br \/>\n    }<\/p>\n<p>    return true;<br \/>\n}<\/p>\n<p>int main()<br \/>\n{<br \/>\n    string s &#061; &#034;&#034;;<br \/>\n    while (getline(cin, s)) {<br \/>\n        cout &lt;&lt; (check(s) ? &#034;YES&#034; : &#034;NO&#034;) &lt;&lt; endl;<br \/>\n    }<\/p>\n<p>    return 0;<br \/>\n} <\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u77e5\u8bc6\u70b92021\u5b57\u7b26\u4e32\u6808\u961f\u5217\u5b89\u5168\u5de5\u7a0b\u5e08\u5c0f\u7c73\u96c6\u56e2\u94fe\u8868<br \/>\n\u63cf\u8ff0<br \/>\nIPV4\u5730\u5740\u53ef\u4ee5\u7528\u4e00\u4e2a32\u4f4d\u65e0\u7b26\u53f7\u6574\u6570\u6765\u8868\u793a&#xff0c;\u4e00\u822c\u7528\u70b9\u5206\u65b9\u5f0f\u6765\u663e\u793a&#xff0c;\u70b9\u5c06IP\u5730\u5740\u5206\u62104\u4e2a\u90e8\u5206&#xff0c;\u6bcf\u4e2a\u90e8\u5206\u4e3a8\u4f4d&#xff0c;\u8868\u793a\u6210\u4e00\u4e2a\u65e0\u7b26\u53f7\u6574\u6570&#xff08;\u56e0\u6b64\u6b63\u53f7\u4e0d\u9700\u8981\u51fa\u73b0&#xff09;&#xff0c;\u598210.137.17.1&#xff0c;\u662f\u6211\u4eec\u975e\u5e38\u719f\u6089\u7684IP\u5730\u5740&#xff0c;\u4e00\u4e2aIP\u5730\u5740\u4e32\u4e2d\u6ca1\u6709\u7a7a\u683c\u51fa\u73b0&#xff08;\u56e0\u4e3a\u8981\u8868\u793a\u6210\u4e00\u4e2a32\u6570\u5b57&#xff09;\u3002 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