{"id":98203,"date":"2026-08-31T11:48:49","date_gmt":"2026-08-31T03:48:49","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/98203.html"},"modified":"2026-08-31T11:48:49","modified_gmt":"2026-08-31T03:48:49","slug":"%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84%e4%b8%8e%e6%95%b0%e7%bb%84%e7%9a%84%e5%9f%ba%e6%9c%ac%e4%bb%8b%e7%bb%8dleetcode-704%e9%a2%98%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/98203.html","title":{"rendered":"\u6570\u636e\u7ed3\u6784\u4e0e\u6570\u7ec4\u7684\u57fa\u672c\u4ecb\u7ecd+Leetcode 704\u9898\u89e3"},"content":{"rendered":"

\u6570\u636e\u7ed3\u6784\u7684\u57fa\u672c\u4ecb\u7ecd<\/h3>\n

\u4ec0\u4e48\u662f\u6570\u636e\u7ed3\u6784<\/h4>\n

\u6570\u636e\u7ed3\u6784\u662f\u8ba1\u7b97\u673a\u7ec4\u7ec7\u3001\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f，\u5305\u542b\u6570\u636e\u672c\u8eab\u3001\u6570\u636e\u4e4b\u95f4\u7684\u5173\u7cfb，\u4ee5\u53ca\u5bf9\u6570\u636e\u7684\u589e\u5220\u6539\u67e5\u64cd\u4f5c\u3002\u540c\u6837\u7684\u6570\u636e，\u9009\u7528\u4e0d\u540c\u6570\u636e\u7ed3\u6784，\u7a0b\u5e8f\u8fd0\u884c\u6548\u7387\u5dee\u522b\u5f88\u5927\u3002\u7b97\u6cd5\u662f\u89e3\u51b3\u95ee\u9898\u7684\u6b65\u9aa4，\u6570\u636e\u7ed3\u6784\u662f\u5b58\u653e\u6570\u636e\u7684\u5bb9\u5668，\u4e8c\u8005\u7d27\u5bc6\u914d\u5408\u3002<\/p>\n

\u4e24\u79cd\u7269\u7406\u5b58\u50a8\u65b9\u5f0f<\/h4>\n

1.\u987a\u5e8f\u5b58\u50a8<\/h5>\n

\u6570\u636e\u5b58\u653e\u5728\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4，\u6bd4\u5982\u6570\u7ec4\u3001Python \u5217\u8868\u3002
\n\u4f18\u70b9：\u53ef\u4ee5\u901a\u8fc7\u4e0b\u6807\u76f4\u63a5\u8bbf\u95ee\u5143\u7d20，\u901f\u5ea6\u5feb\u3002
\n\u7f3a\u70b9：\u5728\u4e2d\u95f4\u4f4d\u7f6e\u63d2\u5165\u3001\u5220\u9664\u5143\u7d20，\u9700\u8981\u79fb\u52a8\u5f88\u591a\u6570\u636e，\u6548\u7387\u4f4e\u3002<\/p>\n

2.\u94fe\u5f0f\u5b58\u50a8<\/h5>\n

\u5185\u5b58\u4e0d\u8fde\u7eed，\u6bcf\u4e2a\u7ed3\u70b9\u4fdd\u5b58\u6570\u636e，\u540c\u65f6\u8bb0\u5f55\u4e0b\u4e00\u4e2a\u7ed3\u70b9\u7684\u4f4d\u7f6e，\u4ee3\u8868\u5c31\u662f\u94fe\u8868\u3002
\n\u4f18\u70b9：\u63d2\u5165\u5220\u9664\u53ea\u4fee\u6539\u7ed3\u70b9\u6307\u5411，\u4e0d\u7528\u79fb\u52a8\u5927\u91cf\u6570\u636e\u3002
\n\u7f3a\u70b9：\u4e0d\u80fd\u76f4\u63a5\u968f\u673a\u8bbf\u95ee，\u67e5\u627e\u5143\u7d20\u9700\u8981\u4ece\u5934\u9010\u4e2a\u904d\u5386\u3002<\/p>\n

\u903b\u8f91\u7ed3\u6784<\/h4>\n

1.\u7ebf\u6027\u7ed3\u6784：\u4e00\u5bf9\u4e00\u7684\u5173\u7cfb（\u5143\u7d20\u6392\u6210\u4e00\u6761\u76f4\u7ebf，\u9664\u5f00\u5934\u5c3e，\u6bcf\u4e2a\u5143\u7d20\u53ea\u6709\u4e00\u4e2a\u524d\u9a71\u548c\u540e\u7ee7）<\/h5>\n

\u6570\u7ec4 \/ \u5217\u8868：\u57fa\u7840\u5bb9\u5668，\u4f9d\u9760\u4e0b\u6807\u8bbf\u95ee
\n\u94fe\u8868：\u5355\u94fe\u8868\u3001\u53cc\u5411\u94fe\u8868\u3001\u5faa\u73af\u94fe\u8868
\n\u6808：\u540e\u8fdb\u5148\u51fa，\u53ea\u80fd\u4ece\u540c\u4e00\u7aef\u5b58\u53d6，\u7528\u4e8e\u62ec\u53f7\u5339\u914d\u3001\u51fd\u6570\u8c03\u7528
\n\u961f\u5217：\u5148\u8fdb\u5148\u51fa，\u4e00\u7aef\u5b58\u4e00\u7aef\u53d6，\u7528\u4e8e\u4efb\u52a1\u6392\u961f\u3001\u5e7f\u5ea6\u4f18\u5148\u641c\u7d22<\/p>\n

2.\u975e\u7ebf\u6027\u7ed3\u6784<\/h5>\n

\u6811：\u4e00\u5bf9\u591a（\u4e00\u4e2a\u8282\u70b9\u5206\u51fa\u591a\u4e2a\u5b50\u8282\u70b9\u3002\u5e38\u89c1\u4e8c\u53c9\u6811\u3001\u4e8c\u53c9\u641c\u7d22\u6811）
\n\u56fe：\u591a\u5bf9\u591a（\u8282\u70b9\u4e4b\u95f4\u53ef\u4ee5\u4efb\u610f\u8fde\u63a5，\u8fb9\u53ef\u4ee5\u5e26\u6743\u91cd\u3001\u65b9\u5411，\u7528\u4e8e\u5730\u56fe\u8def\u5f84\u3001\u793e\u4ea4\u7f51\u7edc\u7b49\u573a\u666f）
\n\u96c6\u5408：\u5143\u7d20\u6ca1\u6709\u987a\u5e8f，\u5143\u7d20\u4e0d\u53ef\u91cd\u590d\u3002<\/p>\n

\u5e38\u89c1\u6570\u636e\u7ed3\u6784\u6838\u5fc3\u7279\u70b9<\/h4>\n

\u6570\u7ec4：\u8fde\u7eed\u5185\u5b58，\u9002\u5408\u4e8c\u5206\u3001\u6392\u5e8f\u3002
\n\u94fe\u8868：\u9002\u5408\u9891\u7e41\u505a\u63d2\u5165\u5220\u9664\u3002
\n\u6808：\u540e\u8fdb\u5148\u51fa\u3002
\n\u961f\u5217：\u5148\u8fdb\u5148\u51fa\u3002
\n\u4e8c\u53c9\u6811：\u5c42\u7ea7\u7ed3\u6784，\u7528\u4e8e\u641c\u7d22\u3002
\n\u56fe：\u8282\u70b9\u548c\u8fb9，\u5904\u7406\u8def\u5f84\u7c7b\u95ee\u9898\u3002<\/p>\n

\u590d\u6742\u5ea6（\u7528\u6765\u8861\u91cf\u6027\u80fd）<\/h4>\n

\u65f6\u95f4\u590d\u6742\u5ea6 O ()：\u63cf\u8ff0\u6570\u636e\u53d8\u591a\u7684\u65f6\u5019，\u7a0b\u5e8f\u8fd0\u884c\u65f6\u95f4\u589e\u957f\u7684\u8d8b\u52bf\u3002<\/h5>\n

O (1) \u5e38\u6570\u7ea7，\u4e0d\u53d7\u6570\u636e\u91cf\u5f71\u54cd
\nO (log n) \u5bf9\u6570\u7ea7，\u4ee3\u8868\u4e8c\u5206\u67e5\u627e，\u6bcf\u6b21\u820d\u5f03\u4e00\u534a\u6570\u636e
\nO (n) \u7ebf\u6027\u7ea7，\u9700\u8981\u904d\u5386\u5168\u90e8\u6570\u636e
\nO (nlogn)，\u5e38\u89c1\u9ad8\u6548\u6392\u5e8f\u7b97\u6cd5
\nO (n\u00b2)，\u53cc\u91cd\u5faa\u73af，\u6548\u7387\u8f83\u4f4e<\/p>\n

\u7a7a\u95f4\u590d\u6742\u5ea6：\u7b97\u6cd5\u989d\u5916\u5360\u7528\u5185\u5b58\u7684\u5927\u5c0f\u3002O (1) \u4ee3\u8868\u51e0\u4e4e\u4e0d\u989d\u5916\u5f00\u8f9f\u5185\u5b58\u3002<\/h5>\n

\u590d\u6742\u5ea6\u53ea\u5173\u6ce8\u589e\u957f\u8d8b\u52bf，\u5ffd\u7565\u5e38\u6570\u3002<\/p>\n

\u903b\u8f91\u7ed3\u6784\u548c\u5b58\u50a8\u7ed3\u6784\u533a\u5206<\/h4>\n

1.\u903b\u8f91\u7ed3\u6784\u6307\u6570\u636e\u62bd\u8c61\u51fa\u6765\u7684\u5173\u7cfb，\u6bd4\u5982\u6808\u903b\u8f91\u4e0a\u540e\u8fdb\u5148\u51fa；
\n2.\u5b58\u50a8\u7ed3\u6784\u6307\u5728\u5185\u5b58\u771f\u5b9e\u5b58\u653e\u5f62\u5f0f，\u6808\u65e2\u53ef\u4ee5\u6570\u7ec4\u5b9e\u73b0，\u4e5f\u53ef\u4ee5\u94fe\u8868\u5b9e\u73b0\u3002<\/p>\n

\u6570\u7ec4\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n

\u4ec0\u4e48\u662f\u6570\u7ec4<\/h4>\n

\u6570\u7ec4\u662f\u6700\u57fa\u7840\u7684\u7ebf\u6027\u987a\u5e8f\u5b58\u50a8\u7684\u6570\u636e\u7ed3\u6784\u3002\u628a\u591a\u4e2a\u76f8\u540c\u7c7b\u578b\u7684\u6570\u636e，\u5b58\u653e\u5728\u5185\u5b58\u4e2d\u4e00\u5757\u8fde\u7eed\u7684\u7a7a\u95f4\u91cc\u3002<\/p>\n

\u6838\u5fc3\u7279\u70b9<\/h4>\n

1.\u5185\u5b58\u8fde\u7eed，\u6240\u6709\u5143\u7d20\u6328\u5728\u4e00\u8d77\u5b58\u653e\u3002
\n2.\u901a\u8fc7\u4e0b\u6807（\u7d22\u5f15）\u8bbf\u95ee\u5143\u7d20，\u4e0b\u6807\u4e00\u822c\u4ece0\u5f00\u59cb\u3002
\n3.\u968f\u673a\u8bbf\u95ee：\u77e5\u9053\u4e0b\u6807，\u5c31\u80fd\u76f4\u63a5\u53d6\u51fa\u5bf9\u5e94\u5143\u7d20，\u65f6\u95f4\u590d\u6742\u5ea6 O (1)\u3002
\n4.\u5b58\u653e\u7684\u5143\u7d20\u4e00\u822c\u8981\u6c42\u7c7b\u578b\u76f8\u540c\u3002<\/p>\n

\u4e0b\u6807（\u7d22\u5f15）<\/h4>\n

\u7b2c\u4e00\u4e2a\u5143\u7d20\u4e0b\u6807\u4e3a 0，\u7b2c\u4e8c\u4e2a\u4e3a 1，\u4f9d\u6b21\u5f80\u540e\u3002
\n\u4f8b\u6570\u7ec4[5, 2, 7]
\n\u4e0b\u6807 0：5，\u4e0b\u6807 1：2，\u4e0b\u6807 2：7\u3002
\n\u6570\u7ec4\u957f\u5ea6\u6307\u7684\u662f\u6570\u7ec4\u91cc\u9762\u4e00\u5171\u6709\u591a\u5c11\u4e2a\u5143\u7d20\u3002<\/p>\n

\u5e38\u89c1\u64cd\u4f5c\u4ee5\u53ca\u6548\u7387<\/h4>\n

1.\u8bfb\u53d6 \/ \u4fee\u6539\u6307\u5b9a\u4e0b\u6807\u5143\u7d20：O (1)，\u76f4\u63a5\u5b9a\u4f4d，\u901f\u5ea6\u5f88\u5feb\u3002
\n2.\u5c3e\u90e8\u6dfb\u52a0\u5143\u7d20：\u4e00\u822c\u6548\u7387\u5f88\u9ad8\u3002
\n3.\u4e2d\u95f4\u4f4d\u7f6e\u63d2\u5165\u3001\u5220\u9664\u5143\u7d20：O (n)\u3002
\n\u56e0\u4e3a\u5185\u5b58\u8fde\u7eed，\u63d2\u5165\u6216\u8005\u5220\u9664\u540e，\u540e\u9762\u6240\u6709\u5143\u7d20\u90fd\u9700\u8981\u6574\u4f53\u5411\u540e \/ \u5411\u524d\u79fb\u52a8\u3002\u6570\u636e\u91cf\u5927\u7684\u65f6\u5019\u6548\u7387\u4f4e\u3002
\n4.\u904d\u5386\u6570\u7ec4：\u4ece\u5934\u5230\u5c3e\u9010\u4e2a\u8bbf\u95ee，O (n)\u3002<\/p>\n

\u6570\u7ec4\u4f18\u7f3a\u70b9<\/h4>\n

\u4f18\u70b9：
\n1.\u652f\u6301\u4e0b\u6807\u968f\u673a\u8bbf\u95ee，\u67e5\u627e\u6307\u5b9a\u4f4d\u7f6e\u901f\u5ea6\u5feb\u3002
\n2.\u5185\u5b58\u8fde\u7eed，\u7f13\u5b58\u53cb\u597d，\u904d\u5386\u901f\u5ea6\u5feb\u3002
\n\u7f3a\u70b9：
\n1.\u4e2d\u95f4\u63d2\u5165\u3001\u5220\u9664\u4ee3\u4ef7\u5927，\u9700\u8981\u79fb\u52a8\u5927\u91cf\u5143\u7d20\u3002
\n2.\u5f88\u591a\u8bed\u8a00\u6570\u7ec4\u957f\u5ea6\u56fa\u5b9a，\u4e00\u65e6\u521b\u5efa，\u4e0d\u80fd\u968f\u610f\u6269\u5bb9<\/p>\n

Leetcode 704+\u9898\u89e3<\/h3>\n

\"\"\u9898\u89e3：<\/h4>\n

\u5728\u5347\u5e8f\u6570\u7ec4 nums \u4e2d\u5bfb\u627e\u76ee\u6807\u503c target，\u5bf9\u4e8e\u7279\u5b9a\u4e0b\u6807 i，\u6bd4\u8f83 nums[i] \u548c target \u7684\u5927\u5c0f：
\n1.\u5982\u679c nums[i]=target，\u5219\u4e0b\u6807 i \u5373\u4e3a\u8981\u5bfb\u627e\u7684\u4e0b\u6807；
\n2.\u5982\u679c nums[i]>target，\u5219 target \u53ea\u53ef\u80fd\u5728\u4e0b\u6807 i \u7684\u5de6\u4fa7；
\n3.\u5982\u679c nums[i]<target，\u5219 target \u53ea\u53ef\u80fd\u5728\u4e0b\u6807 i \u7684\u53f3\u4fa7\u3002<\/p>\n

\u56e0\u4e3a\u5b9a\u4e49\u67e5\u627e\u7684\u8303\u56f4 [left,right]，\u6240\u4ee5\u521d\u59cb\u67e5\u627e\u8303\u56f4\u662f\u6574\u4e2a\u6570\u7ec4\u3002\u6bcf\u6b21\u53d6\u67e5\u627e\u8303\u56f4\u7684\u4e2d\u70b9 mid，\u6bd4\u8f83 nums[mid] \u548c target \u7684\u5927\u5c0f，\u5982\u679c\u76f8\u7b49\u5219 mid \u5373\u4e3a\u8981\u5bfb\u627e\u7684\u4e0b\u6807，\u5982\u679c\u4e0d\u76f8\u7b49\u5219\u6839\u636e nums[mid] \u548c target \u7684\u5927\u5c0f\u5173\u7cfb\u5c06\u67e5\u627e\u8303\u56f4\u7f29\u5c0f\u4e00\u534a\u3002
\n\u4e8c\u5206\u67e5\u627e\u7684\u6761\u4ef6\u662f\u67e5\u627e\u8303\u56f4\u4e0d\u4e3a\u7a7a，\u5373 left\u2264right\u3002\u5982\u679c target \u5728\u6570\u7ec4\u4e2d，\u4e8c\u5206\u67e5\u627e\u53ef\u4ee5\u4fdd\u8bc1\u627e\u5230 target，\u8fd4\u56de target \u5728\u6570\u7ec4\u4e2d\u7684\u4e0b\u6807\u3002\u5982\u679c target \u4e0d\u5728\u6570\u7ec4\u4e2d，\u5219\u5f53 left>right \u65f6\u7ed3\u675f\u67e5\u627e，\u8fd4\u56de \u22121\u3002<\/p>\n

\u5de6\u95ed\u53f3\u95ed [left, right]<\/h4>\n

\u533a\u95f4\u542b\u4e49：left \u4e0e right \u4e0b\u6807\u5bf9\u5e94\u7684\u5143\u7d20\u90fd\u53c2\u4e0e\u67e5\u627e\u3002
\nright \u521d\u59cb\u503c：len(nums)-1，\u6570\u7ec4\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u4e0b\u6807\u3002
\nwhile \u5faa\u73af\u6761\u4ef6：left <= right
\n\u5f53 left \u7b49\u4e8e right，\u533a\u95f4\u91cc\u9762\u8fd8\u6709\u4e00\u4e2a\u6709\u6548\u7684\u5143\u7d20，\u9700\u8981\u6267\u884c\u5faa\u73af\u8fdb\u884c\u5224\u65ad\u3002<\/p>\n

\u66f4\u65b0\u8fb9\u754c\u89c4\u5219<\/h5>\n

nums [mid] > target \u2192 \u76ee\u6807\u5728\u5de6\u4fa7，right = mid – 1
\nmid \u5df2\u7ecf\u6bd4\u5bf9\u5b8c\u6bd5，\u4e0d\u9700\u8981\u518d\u6b21\u7eb3\u5165\u67e5\u627e\u533a\u95f4\u3002
\nnums [mid] < target \u2192 \u76ee\u6807\u5728\u53f3\u4fa7，left = mid + 1<\/p>\n

\u5de6\u95ed\u53f3\u5f00 [left, right)<\/h4>\n

\u533a\u95f4\u542b\u4e49：\u5305\u542b left，\u4e0d\u5305\u542b right \u4e0b\u6807，right \u4ec5\u4ec5\u4f5c\u4e3a\u8fb9\u754c\u3002
\nright \u521d\u59cb\u503c：len(nums)，\u5b83\u8d85\u51fa\u6570\u7ec4\u6700\u5927\u4e0b\u6807，\u4e0d\u662f\u5408\u6cd5\u5143\u7d20\u3002
\nwhile \u5faa\u73af\u6761\u4ef6：left < right
\nleft \u4e0e right \u76f8\u7b49\u65f6，\u533a\u95f4\u91cc\u9762\u4e0d\u5b58\u5728\u5143\u7d20，\u5faa\u73af\u7ec8\u6b62\u3002<\/p>\n

\u66f4\u65b0\u8fb9\u754c\u89c4\u5219<\/h5>\n

nums [mid] > target \u2192 right = mid
\nmid \u4e0b\u6807\u4e0d\u5728\u65b0\u533a\u95f4，\u53f3\u8fb9\u754c\u76f4\u63a5\u8d4b\u503c mid\u3002
\nnums [mid] < target \u2192 left = mid + 1<\/p>\n","protected":false},"excerpt":{"rendered":"

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