{"id":1541,"date":"2024-11-14T11:49:21","date_gmt":"2024-11-14T03:49:21","guid":{"rendered":"http:\/\/114.55.108.251\/?p=1541"},"modified":"2025-01-14T11:24:25","modified_gmt":"2025-01-14T03:24:25","slug":"leetcode-hot100%e5%9b%9e%e6%ba%af","status":"publish","type":"post","link":"https:\/\/guapicoding.com\/?p=1541","title":{"rendered":"LeetCode hot100@\u56de\u6eaf"},"content":{"rendered":"\n<p class=\"has-text-align-center wp-block-paragraph\"><em><strong>More content<\/strong><\/em><strong><em>\uff1a<\/em><\/strong><a href=\"https:\/\/guapicoding.com\/?p=1543\" data-type=\"post\" data-id=\"1543\">\u529b\u6263\u9898\u8bb0\u4e4b\u56de\u6eaf<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u56de\u6eaf\u662f\u9012\u5f52\u7684\u526f\u4ea7\u7269\uff0c\u53ea\u8981\u6709\u9012\u5f52\u5c31\u4f1a\u6709\u56de\u6eaf<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u56de\u6eaf\u7b97\u6cd5\u6a21\u677f\uff1a<\/strong><em><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">\u56de\u6eaf\u9012\u5f52\u662f\u5f80\u6df1\u5904\u627e\uff0c\u5185\u90e8for\u904d\u5386\u662f\u6a2a\u5411\u627e<\/mark><\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void backtracking(\u53c2\u6570) {\n    if (\u7ec8\u6b62\u6761\u4ef6) {\n        \u5b58\u653e\u7ed3\u679c;\n        return;\n    }\n\n    for (\u9009\u62e9\uff1a\u672c\u5c42\u96c6\u5408\u4e2d\u5143\u7d20\uff08\u6811\u4e2d\u8282\u70b9\u5b69\u5b50\u7684\u6570\u91cf\u5c31\u662f\u96c6\u5408\u7684\u5927\u5c0f\uff09) {\n        \u5904\u7406\u8282\u70b9;\n        backtracking(\u8def\u5f84\uff0c\u9009\u62e9\u5217\u8868); \/\/ \u9012\u5f52\n        \u56de\u6eaf\uff0c\u64a4\u9500\u5904\u7406\u7ed3\u679c\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u4e2d\uff0c\u56de\u6eaf\u6709\u4ee5\u4e0b\u4e24\u79cd\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2460\u660e\u786e\u4fee\u6539\u503c\uff0c\u518d\u64a4\u9500\u4fee\u6539<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>path.push_back(i);\nsum -= i;\ndepth++;\nbackTracking(sum, depth);\nsum += i;\ndepth--;\npath.pop_back()<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u2461\u4ee5\u4f20\u9012\u53c2\u6570\u7684\u5f62\u5f0f\u4fee\u6539\uff0c\u9012\u5f52\u51fd\u6570\u5185\u4f7f\u7528\u7684\u662f\u65b0\u7684\u53d8\u91cf\u503c\uff0c\u5916\u90e8\u53d8\u91cf\u503c\u672a\u88ab\u4fee\u6539\uff0c\u76f8\u5f53\u4e8e\u56de\u6eaf\u4e86<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>path.push_back(i);\nbackTracking(sum - i, depth + 1); \/\/\u6ce8\u610fdepth+1\u4e00\u5b9a\u4e0d\u8981\u5199\u6210depth++\uff0c\u4e0d\u7136\u503c\u5c31\u6539\u53d8\u4e86\npath.pop_back()<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u56de\u6eaf\u7b97\u6cd5\u53ef\u89e3\u51b3\u7684\u95ee\u9898\u7c7b\u578b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7ec4\u5408\u95ee\u9898\uff1aN\u4e2a\u6570\u91cc\u9762\u6309\u4e00\u5b9a\u89c4\u5219\u627e\u51fak\u4e2a\u6570\u7684\u96c6\u5408<\/li>\n\n\n\n<li>\u5207\u5272\u95ee\u9898\uff1a\u4e00\u4e2a\u5b57\u7b26\u4e32\u6309\u4e00\u5b9a\u89c4\u5219\u6709\u51e0\u79cd\u5207\u5272\u65b9\u5f0f<\/li>\n\n\n\n<li>\u5b50\u96c6\u95ee\u9898\uff1a\u4e00\u4e2aN\u4e2a\u6570\u7684\u96c6\u5408\u91cc\u6709\u591a\u5c11\u7b26\u5408\u6761\u4ef6\u7684\u5b50\u96c6<\/li>\n\n\n\n<li>\u6392\u5217\u95ee\u9898\uff1aN\u4e2a\u6570\u6309\u4e00\u5b9a\u89c4\u5219\u5168\u6392\u5217\uff0c\u6709\u51e0\u79cd\u6392\u5217\u65b9\u5f0f<\/li>\n\n\n\n<li>\u68cb\u76d8\u95ee\u9898\uff1aN\u7687\u540e\uff0c\u89e3\u6570\u72ec\u7b49\u7b49<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/permutations\/\">46. \u5168\u6392\u5217<\/a>\u2705<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>\u7528\u4e00\u4e2a\u6570\u7ec4\u6765\u8bb0\u5f55nums\u4e0b\u6807\u7684\u72b6\u6001\uff0c\u5373\u8bb0\u5f55\u4e0b\u6807\u5bf9\u5e94\u7684\u5143\u7d20\u662f\u5426\u88ab\u7528\u8fc7(\u6bd4\u5982flags[2] = 1\u4ee3\u8868nums[2]\u88ab\u4f7f\u7528\u8fc7\u4e86)<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>ps\uff1a\u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u8bb0\u5f55\u5143\u7d20\u662f\u5426\u88ab\u7528\u8fc7\uff1f\u56e0\u4e3a\u5143\u7d20\u4e2d\u6709\u8d1f\u6570\uff0c\u4e0b\u6807\u90fd\u662f\u975e\u8d1f\u6570\uff0c\u6240\u4ee5\u7528\u4e0b\u6807\u6765\u8bb0\u5f55\u4e0b\u6807\uff0c\u53cd\u6b63nums\u6570\u7ec4\u7684\u4e0b\u6807\u548c\u5143\u7d20\u5bf9\u5e94\u5173\u7cfb\u4e0d\u4f1a\u53d8<\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {<br>private:<br>    vector&lt;vector&lt;int&gt;&gt; res;<br>    vector&lt;int&gt; path;<br>    vector&lt;int&gt; flags;<br>public:<br>    void backTracking(vector&lt;int&gt;&amp; nums) {<br>        if(path.size() == nums.size()) {<br>            res.push_back(path);<br>            return ;<br>        }<br><br>        for(int i = 0; i &lt; nums.size(); i++) {<br>            if(flags&#91;i]) continue;<br>            path.push_back(nums&#91;i]);<br>            flags&#91;i] = 1;<br>            backTracking(nums);<br>            path.pop_back();<br>            flags&#91;i] = 0;<br>        }<br>    }<br>    vector&lt;vector&lt;int&gt;&gt; permute(vector&lt;int&gt;&amp; nums) {<br>        flags.resize(nums.size(), 0);<br>        backTracking(nums);<br>        <br>        return res;<br>    }<br>};\n\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/subsets\/\">78. \u5b50\u96c6<\/a>\u2705<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>\u63a7\u5236\u4e00\u4e0b\u957f\u5ea6\u5373\u53ef<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {<br>private:<br>    vector&lt;vector&lt;int&gt;&gt; res;<br>    vector&lt;int&gt; path;<br><br>public:<br>    void backTracking(vector&lt;int&gt;&amp; nums, int startIndex, int len) {<br>        if(path.size() == len) {<br>            res.push_back(path);<br>            return ;<br>        }<br><br>        for(int i = startIndex; i &lt; nums.size(); i++) {<br>            path.push_back(nums&#91;i]);<br>            backTracking(nums, i + 1, len);<br>            path.pop_back();<br>        }<br>    }<br>    vector&lt;vector&lt;int&gt;&gt; subsets(vector&lt;int&gt;&amp; nums) {<br>        res.push_back({});<br>        res.push_back(nums);<br><br>        for(int i = 1; i &lt; nums.size(); i++) {<br>            backTracking(nums, 0, i);<br>        }<br><br>        return res;<br>    }<br>};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/letter-combinations-of-a-phone-number\/\">17. \u7535\u8bdd\u53f7\u7801\u7684\u5b57\u6bcd\u7ec4\u5408<\/a>\u2705<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>\u5b9a\u4e49\u5168\u5c40\u53d8\u91cf\uff0c\u7cbe\u7b80\u9012\u5f52\u51fd\u6570\u53c2\u6570<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\nprivate:\n    vector&lt;string&gt; res;\n    string path;\n    int n;\n    unordered_map&lt;char, string&gt; mp;\npublic:\n    void backtracking(string digits, int depth) {\n        if(path.size() == n) {\n            res.push_back(path);\n            return ;\n        }\n\n        for(const char &amp;i : mp&#91;digits&#91;depth]]) {\n            path += i;\n            backtracking(digits, depth + 1);\n            path.erase(path.size() - 1, 1);\n        }\n    }\n    vector&lt;string&gt; letterCombinations(string digits) {\n        if(!digits.size()) return res;\n        \n        mp&#91;'2'] = \"abc\";\n        mp&#91;'3'] = \"def\";\n        mp&#91;'4'] = \"ghi\";\n        mp&#91;'5'] = \"jkl\";\n        mp&#91;'6'] = \"mno\";\n        mp&#91;'7'] = \"pqrs\";\n        mp&#91;'8'] = \"tuv\";\n        mp&#91;'9'] = \"wxyz\";\n\n        n = digits.size();\n        backtracking(digits, 0);\n\n        return res;\n    }\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/combination-sum\/\">39. \u7ec4\u5408\u603b\u548c<\/a>\u2705<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>target\u9012\u51cf\uff0c\u7531\u4e24\u4e2a\u53c2\u6570\u53d8\u4e3a\u4e00\u4e2a\u53c2\u6570<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\nprivate:\n    vector&lt;vector&lt;int&gt;&gt; res;\n    vector&lt;int&gt; path;\npublic:\n    void backtracking(vector&lt;int&gt;&amp; candidates, int sub_target, int startIndex) {\n        if(sub_target &lt; 0) return ; \/\/\u548c\u8d85\u51fa\u76ee\u6807\u4e86\uff0c\u4f5c\u5e9f\n        if(!sub_target) { \/\/\u548c\u6b63\u597d\u7b49\u4e8e\u76ee\u6807\u503c\uff0c\u8bb0\u5f55\n            res.push_back(path);\n            return ;\n        }\n\n        for(int i = startIndex; i &lt; candidates.size(); i++) {\n            path.push_back(candidates&#91;i]);\n            backtracking(candidates, sub_target - candidates&#91;i], i); \/\/\u5141\u8bb8\u91cd\u590d\u9009\u53d6\u5f53\u524d\u5143\u7d20\uff0c\u4f46\u4e0d\u80fd\u56de\u5230\u4e4b\u524d\u7684\u5143\u7d20\n            path.pop_back();\n        }\n    }\n    vector&lt;vector&lt;int&gt;&gt; combinationSum(vector&lt;int&gt;&amp; candidates, int target) {\n        backtracking(candidates, target, 0);\n\n        return res;\n    }\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/generate-parentheses\/\">22. \u62ec\u53f7\u751f\u6210<\/a>\u2705<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u4e00\u4e2a\u5b57\u7b26\u4e00\u4e2a\u5b57\u7b26\u5730\u9012\u5f52\u7740\u5f80\u540e\u641c\uff0c\u6bcf\u4e2a\u5b57\u7b26\u53ea\u6709\u4e24\u79cd\u53ef\u80fd\u6027<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u5148\u641c\u51fa\u6765\u518d\u68c0\u6d4b\u5408\u6cd5\u6027<\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\nprivate:\n    vector&lt;string&gt; res;\n    string path = \"(\"; \/\/\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5fc5\u662f\u5de6\u62ec\u53f7\npublic:\n    void backTracking(int n) {\n        if(path.size() == n * 2) {\n            if(checkValid(path)) res.push_back(path);\n            return ;\n        }\n\n        path += '(';\n        backTracking(n);\n        path.erase(path.size() - 1, 1);\n\n        path += ')';\n        backTracking(n);\n        path.erase(path.size() - 1, 1);\n    }\n\n    bool checkValid(string s) { \n        stack&lt;char&gt; sk;\n        for(const char &amp;c : s) {\n            if(c == ')' &amp;&amp; !sk.empty() &amp;&amp; sk.top() == '(') sk.pop();\n            else sk.push(c);\n        }\n        if(sk.empty()) return true;\n        return false;\n    }\n\n    vector&lt;string&gt; generateParenthesis(int n) {\n        backTracking(n);\n        return res;\n    }\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/word-search\/\">79. \u5355\u8bcd\u641c\u7d22<\/a>\u2705<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u4e00\u4e2a\u683c\u5b50\u4e00\u4e2a\u683c\u5b50\u5730\u9012\u5f52\u56de\u6eaf\u7740\u641c\uff0c\u904d\u5386\u56db\u4e2a\u65b9\u5411<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u4e0d\u7528\u5b58\u50a8\u7b54\u6848\uff0c\u9047\u5230\u76f4\u63a5\u8fd4\u56de\uff0c\u56e0\u6b64\u9012\u5f52\u51fd\u6570\u8fd4\u56de\u503c\u4e3abool<\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\nprivate:\n    int m, n; \/\/m\u884cn\u5217\npublic:\n    bool backTracking(vector&lt;vector&lt;char&gt;&gt;&amp; board, vector&lt;vector&lt;bool&gt;&gt; &amp;used, string word, int row, int col, int index) {\n        if(index == word.size()) return true;\n\n        \/\/\u904d\u5386\u56db\u4e2a\u65b9\u5411\n        if(row != 0 &amp;&amp; board&#91;row - 1]&#91;col] == word&#91;index] &amp;&amp; !used&#91;row - 1]&#91;col]) { \/\/\u4e0a\n            used&#91;row - 1]&#91;col] = true;\n            if(backTracking(board, used, word, row - 1, col, index + 1)) return true; \/\/\u4e00\u65e6\u641c\u5230\u7b54\u6848\uff0c\u7acb\u523b\u8fd4\u56de \n            used&#91;row - 1]&#91;col] = false;\n        }\n        if(row != m - 1 &amp;&amp; board&#91;row + 1]&#91;col] == word&#91;index] &amp;&amp; !used&#91;row + 1]&#91;col]) { \/\/\u4e0b\n            used&#91;row + 1]&#91;col] = true;\n            if(backTracking(board, used, word, row + 1, col, index + 1)) return true; \/\/\u4e00\u65e6\u641c\u5230\u7b54\u6848\uff0c\u7acb\u523b\u8fd4\u56de \n            used&#91;row + 1]&#91;col] = false;\n        }\n        if(col != 0 &amp;&amp; board&#91;row]&#91;col - 1] == word&#91;index] &amp;&amp; !used&#91;row]&#91;col - 1]) { \/\/\u5de6\n            used&#91;row]&#91;col - 1] = true;\n            if(backTracking(board, used, word, row, col - 1, index + 1)) return true; \/\/\u4e00\u65e6\u641c\u5230\u7b54\u6848\uff0c\u7acb\u523b\u8fd4\u56de \n            used&#91;row]&#91;col - 1] = false;\n        }\n        if(col != n - 1 &amp;&amp; board&#91;row]&#91;col + 1] == word&#91;index] &amp;&amp; !used&#91;row]&#91;col + 1]) { \/\/\u53f3\n            used&#91;row]&#91;col + 1] = true;\n            if(backTracking(board, used, word, row, col + 1, index + 1)) return true; \/\/\u4e00\u65e6\u641c\u5230\u7b54\u6848\uff0c\u7acb\u523b\u8fd4\u56de \n            used&#91;row]&#91;col + 1] = false;\n        }\n\n        return false; \/\/\u56db\u4e2a\u65b9\u5411\u90fd\u641c\u5bfb\u65e0\u679c\uff0c\u8fd4\u56defalse                    \n    }\n    bool exist(vector&lt;vector&lt;char&gt;&gt;&amp; board, string word) {\n        m = board.size();\n        n = board&#91;0].size();\n\n        vector&lt;vector&lt;bool&gt;&gt; used(m, vector&lt;bool&gt;(n, false)); \/\/\u521d\u59cb\u5316\u6807\u8bb0\u6570\u7ec4\n\n        \/\/\u641c\u5230\u9996\u5b57\u6bcd\u8fdb\u5165\u9012\u5f52\n        for(int i = 0; i &lt; m; i++) {\n            for(int j = 0; j &lt; n; j++) {\n                if(board&#91;i]&#91;j] == word&#91;0]) {\n                    used&#91;i]&#91;j] = true;\n                    if(backTracking(board, used, word, i, j, 1)) return true;\n                    used&#91;i]&#91;j] = false; \/\/\u867d\u7136\u8fd9\u4e2a\u9996\u5b57\u6bcd\u6ca1\u8d70\u5230\u6700\u540e\uff0c\u4f46\u53ef\u80fd\u522b\u4eba\u8fd8\u9700\u8981\u5b83\n                }\n            }\n        }\n\n        return false;\n\n    }\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/palindrome-partitioning\/\">131. \u5206\u5272\u56de\u6587\u4e32<\/a>\u2705<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u4e0e<a href=\"https:\/\/leetcode.cn\/problems\/restore-ip-addresses\/\">93. \u590d\u539f IP \u5730\u5740<\/a>\u601d\u8def\u4e00\u6837(\u904d\u5386\u56de\u6eaf\u5207\u5272 + \u68c0\u6d4b\u975e\u6cd5\u5b57\u6bb5) \u4f46\u66f4\u7b80\u5355\u4e00\u4e9b<\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\nprivate:\n    vector&lt;vector&lt;string&gt;&gt; res;\n    vector&lt;string&gt; path;\npublic:\n    void backTracking(string s, int startIndex) {\n        if(s.size() == startIndex) {\n            res.push_back(path);\n            return ;\n        }\n  \n        for(int i = 1; startIndex + i &lt;= s.size(); i++) { \/\/\u904d\u5386\u8981\u5207\u7684\u4f4d\u6570    \n            if(!checkPalindrome(s, startIndex, i)) continue;\n            path.push_back(s.substr(startIndex, i));\n            backTracking(s, startIndex + i);\n            path.pop_back();\n        }\n    }\n\n    bool checkPalindrome(string s, int beginIndex, int len) {\n        int l = beginIndex;\n        int r = beginIndex + len - 1;\n        while(l &lt;= r) {\n            if(s&#91;l++] != s&#91;r--]) return false;\n        }\n        return true;\n    }\n\n    vector&lt;vector&lt;string&gt;&gt; partition(string s) {\n        backTracking(s, 0);\n        \/\/ if(checkPalindrome(s, 0, 3)) cout &lt;&lt; \"yes\";\n        \/\/ else cout &lt;&lt; \"no\";\n        return res;\n    }\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/n-queens\/\">51. N \u7687\u540e<\/a>\u274c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em><s>\u601d\u8def\u6ca1\u95ee\u9898\uff0c\u5148\u6309\u884c\u641c\u51fa\u6240\u6709\u65b9\u6848\uff0c\u518d\u5bf9\u5217\u3001\u6487\u3001\u637a\u8fdb\u884c\u5408\u6cd5\u6027\u68c0\u67e5\uff0c\u4f46\u6ca1\u60f3\u51fa\u6487\u548c\u637a\u7684\u68c0\u67e5\u516c\u5f0f\uff0c\u7f3a\u70b9\u662f\u641c\u51fa\u6240\u6709\u65b9\u6848\u5728\u7b5b\u9009\uff0c\u6548\u7387\u4f4e<\/s><\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u5728\u641c\u7684\u8fc7\u7a0b\u4e2d\u5c31\u68c0\u67e5\u5408\u6cd5\u6027\uff0c\u975e\u6cd5\u7684\u76f4\u63a5\u8df3\u8fc7<\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\nprivate:\n    vector&lt;vector&lt;string&gt;&gt; res;\npublic:\n    void backTracking(vector&lt;string&gt; &amp;tep, int n, int row) {\n        if(row == n) {\n            res.push_back(tep); \n            return ;\n        }\n\n        for(int col = 0; col &lt; n; col++) { \/\/\u53ea\u904d\u5386\u5f53\u524d\u884c\u7684\u6bcf\u5217\uff0c\u904d\u5386\u884c\u9012\u5f52\u5b9e\u73b0\n            if(checkValid(row, col, tep, n)) { \n                tep&#91;row]&#91;col] = 'Q';\n                backTracking(tep, n, row + 1); \/\/row\u76f8\u5f53\u4e8e\u6df1\u5ea6\n                tep&#91;row]&#91;col] = '.'; \/\/\u56de\u6eaf,\u64a4\u9500Q\n            }\n        }\n    }\n\n    bool checkValid(int row, int col, vector&lt;string&gt; &amp;tep, int n) {\n        for(int i = 0; i &lt; n; i++) { \/\/\u68c0\u67e5\u5217\n            if(tep&#91;i]&#91;col] == 'Q') return false;\n        }\n      \n        for(int i = row - 1, j = col - 1; i &gt;= 0 &amp;&amp; j &gt;= 0; i--, j--) { \/\/\u68c0\u67e5\u637a\n            if(tep&#91;i]&#91;j] == 'Q') {\n                return false;\n            }\n        }\n\n        for(int i = row - 1, j = col + 1; i &gt;= 0 &amp;&amp; j &lt; n; i--, j++) { \/\/\u68c0\u67e5\u6487\n            if(tep&#91;i]&#91;j] == 'Q') {\n                return false;\n            }\n        }\n\n        return true;\n    }\n    \n    vector&lt;vector&lt;string&gt;&gt; solveNQueens(int n) {\n        vector&lt;string&gt; tep(n, string(n, '.')); \/\/\u521d\u59cb\u5316\u68cb\u76d8\uff0c\u7b49\u6548\u4e8e\u4e0b\u9762\u6570\u884c\n        \/\/ vector&lt;string&gt; tep;\n        \/\/ for(int i = 0; i &lt; n; i++) {\n        \/\/     string s;\n        \/\/     for(int j = 0; j &lt; n; j++) {\n        \/\/         s += '.';\n        \/\/     }\n        \/\/     tep.push_back(s);\n        \/\/ }\n        backTracking(tep, n, 0);\n        \n        return res;\n    }\n};<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>More content\uff1a\u529b\u6263\u9898\u8bb0\u4e4b\u56de\u6eaf \u56de\u6eaf\u662f\u9012\u5f52\u7684\u526f\u4ea7\u7269\uff0c\u53ea\u8981\u6709\u9012\u5f52\u5c31\u4f1a\u6709\u56de\u6eaf \u56de\u6eaf\u7b97\u6cd5\u6a21\u677f\uff1a\u56de\u6eaf\u9012\u5f52\u662f\u5f80 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[18,19,55],"class_list":["post-1541","post","type-post","status-publish","format-standard","hentry","category-suanfa","tag-leetcode","tag-19","tag-55"],"_links":{"self":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1541","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1541"}],"version-history":[{"count":26,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1541\/revisions"}],"predecessor-version":[{"id":2325,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1541\/revisions\/2325"}],"wp:attachment":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}