{"id":337,"date":"2025-09-02T14:32:59","date_gmt":"2025-09-02T06:32:59","guid":{"rendered":"https:\/\/heyingnian.com\/?p=337"},"modified":"2025-09-02T14:36:35","modified_gmt":"2025-09-02T06:36:35","slug":"leetcode-240","status":"publish","type":"post","link":"https:\/\/heyingnian.com\/index.php\/2025\/09\/02\/leetcode-240\/","title":{"rendered":"\u641c\u7d22\u4e8c\u7ef4\u77e9\u9635 II"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\ud83d\udd17 \u641c\u7d22\u4e8c\u7ef4\u77e9\u9635 II<\/h1>\n\n\n\n<p>\u9898\u76ee\u6765\u6e90\uff1a<a target=\"_blank\" rel=\"noreferrer noopener\"><a href=\"https:\/\/leetcode.cn\/problems\/search-a-2d-matrix-ii\/?envType=study-plan-v2&amp;envId=top-100-liked\" target=\"_blank\" rel=\"noopener\">240. \u641c\u7d22\u4e8c\u7ef4\u77e9\u9635 II &#8211; \u529b\u6263\uff08LeetCode\uff09<\/a><\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udccc \u9898\u76ee\u63cf\u8ff0<\/p>\n\n\n\n<p>\u7f16\u5199\u4e00\u4e2a\u9ad8\u6548\u7684\u7b97\u6cd5\u6765\u641c\u7d22 <code>m x n<\/code> \u77e9\u9635 <code>matrix<\/code> \u4e2d\u7684\u4e00\u4e2a\u76ee\u6807\u503c <code>target<\/code>\u3002\u8be5\u77e9\u9635\u5177\u6709\u4ee5\u4e0b\u7279\u6027\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6bcf\u884c\u7684\u5143\u7d20\u4ece\u5de6\u5230\u53f3\u5347\u5e8f\u6392\u5217<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u6bcf\u5217\u7684\u5143\u7d20\u4ece\u4e0a\u5230\u4e0b\u5347\u5e8f\u6392\u5217<\/strong>\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4f60\u9700\u8981\u8fd4\u56de <code>true<\/code> \u5982\u679c\u80fd\u5728\u77e9\u9635\u4e2d\u627e\u5230\u76ee\u6807\u503c\uff0c\u5426\u5219\u8fd4\u56de <code>false<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u2705 \u793a\u4f8b\u89e3\u6790<\/p>\n\n\n\n<p><strong>\u793a\u4f8b 1<\/strong>\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/heyingnian.com\/wp-content\/uploads\/2025\/09\/image-7.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"402\" height=\"402\" data-original=\"https:\/\/heyingnian.com\/wp-content\/uploads\/2025\/09\/image-7.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-339\"  sizes=\"auto, (max-width: 402px) 100vw, 402px\" \/><\/div><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u5165\uff1a<code>matrix = [[1,4,7,11,15],[2,5,8,12,19],[3,6,9,16,22],[10,13,14,17,24],[18,21,23,26,30]], target = 5<\/code><\/li>\n\n\n\n<li>\u8f93\u51fa\uff1a<code>true<\/code><\/li>\n\n\n\n<li>\u89e3\u91ca\uff1a\u6570\u5b57\u00a0<code>5<\/code>\u00a0\u5b58\u5728\u4e8e\u77e9\u9635\u4e2d\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u793a\u4f8b 2<\/strong>\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/heyingnian.com\/wp-content\/uploads\/2025\/09\/image-8.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"402\" height=\"402\" data-original=\"https:\/\/heyingnian.com\/wp-content\/uploads\/2025\/09\/image-8.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-340\"  sizes=\"auto, (max-width: 402px) 100vw, 402px\" \/><\/div><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u5165\uff1a<code>matrix = [[1,4,7,11,15],[2,5,8,12,19],[3,6,9,16,22],[10,13,14,17,24],[18,21,23,26,30]], target = 20<\/code><\/li>\n\n\n\n<li>\u8f93\u51fa\uff1a<code>false<\/code><\/li>\n\n\n\n<li>\u89e3\u91ca\uff1a\u6570\u5b57\u00a0<code>20<\/code>\u00a0\u4e0d\u5b58\u5728\u4e8e\u77e9\u9635\u4e2d\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u26a0\ufe0f \u63d0\u793a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>m == matrix.length<\/code><\/li>\n\n\n\n<li><code>n == matrix[i].length<\/code><\/li>\n\n\n\n<li><code>1 &lt;= m, n &lt;= 300<\/code><\/li>\n\n\n\n<li><code>-10\u2079 &lt;= matrix[i][j] &lt;= 10\u2079<\/code><\/li>\n\n\n\n<li>\u6bcf\u884c\u7684\u6240\u6709\u5143\u7d20\u4ece\u5de6\u5230\u53f3\u5347\u5e8f\u6392\u5217<\/li>\n\n\n\n<li>\u6bcf\u5217\u7684\u6240\u6709\u5143\u7d20\u4ece\u4e0a\u5230\u4e0b\u5347\u5e8f\u6392\u5217<\/li>\n\n\n\n<li><code>-10\u2079 &lt;= target &lt;= 10\u2079<\/code><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udca1 \u89e3\u6cd5\uff1aZ \u5b57\u5f62\u67e5\u627e \u2014\u2014 O(m + n) \u65f6\u95f4\uff0cO(1) \u989d\u5916\u7a7a\u95f4<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\n    public boolean searchMatrix(int&#91;]&#91;] matrix, int target) {\n        int m = matrix.length;\n        int n = matrix&#91;0].length - 1; \n        int i = 0, j = n;\n\n        while (i &lt; m &amp;&amp; j >= 0) {\n            if (matrix&#91;i]&#91;j] == target) {\n                return true;\n            } else if (matrix&#91;i]&#91;j] &lt; target) {\n                i++; \n            } else {\n                j--; \n            }\n        }\n\n        return false;\n    }\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udcca \u590d\u6742\u5ea6\u5206\u6790<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(m + n)<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u6700\u591a\u8fdb\u884c\u00a0<code>m + n<\/code>\u00a0\u6b65\u64cd\u4f5c\uff08\u6bcf\u6b21\u79fb\u52a8\u4e00\u884c\u6216\u4e00\u5217\uff09\u3002<\/li>\n\n\n\n<li>\u5b9e\u9645\u4e0a\uff0c\u6bcf\u4e00\u6b65\u90fd\u4f1a\u7f29\u5c0f\u641c\u7d22\u8303\u56f4\uff0c\u56e0\u6b64\u5e73\u5747\u60c5\u51b5\u4e0b\u7684\u6027\u80fd\u53ef\u80fd\u66f4\u597d\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(1)<\/strong> \u2705\n<ul class=\"wp-block-list\">\n<li>\u4ec5\u4f7f\u7528\u5e38\u6570\u4e2a\u989d\u5916\u53d8\u91cf\uff1a<code>m<\/code>,\u00a0<code>n<\/code>,\u00a0<code>i<\/code>,\u00a0<code>j<\/code>\u3002<\/li>\n\n\n\n<li>\u6240\u6709\u64cd\u4f5c\u5747\u5728\u539f\u77e9\u9635\u4e0a\u8fdb\u884c\uff0c\u5b8c\u5168\u539f\u5730\u8ba1\u7b97\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83e\udde9 \u89e3\u9898\u601d\u8def<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6838\u5fc3\u601d\u60f3\uff1a\u5229\u7528\u6392\u5e8f\u7279\u6027\uff0cZ \u5b57\u5f62\u67e5\u627e<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u7531\u4e8e\u77e9\u9635\u7684\u6bcf\u884c\u548c\u6bcf\u5217\u90fd\u662f<strong>\u5347\u5e8f\u6392\u5217<\/strong>\uff0c\u53ef\u4ee5\u4ece<strong>\u53f3\u4e0a\u89d2<\/strong>\u5f00\u59cb\u67e5\u627e\u3002<\/li>\n\n\n\n<li>\u82e5\u5f53\u524d\u5143\u7d20\u7b49\u4e8e\u76ee\u6807\u503c\uff0c\u5219\u627e\u5230\u4e86\uff1b<\/li>\n\n\n\n<li>\u82e5\u5f53\u524d\u5143\u7d20\u5c0f\u4e8e\u76ee\u6807\u503c\uff0c\u5219\u5411\u4e0b\u79fb\u52a8\uff08\u56e0\u4e3a\u4e0b\u65b9\u7684\u5143\u7d20\u66f4\u5927\uff09\uff1b<\/li>\n\n\n\n<li>\u82e5\u5f53\u524d\u5143\u7d20\u5927\u4e8e\u76ee\u6807\u503c\uff0c\u5219\u5411\u5de6\u79fb\u52a8\uff08\u56e0\u4e3a\u5de6\u4fa7\u7684\u5143\u7d20\u66f4\u5c0f\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4e3a\u4ec0\u4e48\u9009\u62e9\u53f3\u4e0a\u89d2\uff1f<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u53f3\u4e0a\u89d2\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u8d77\u70b9\uff1a\n<ul class=\"wp-block-list\">\n<li>\u5411\u4e0b\u53ef\u4ee5\u627e\u5230\u66f4\u5927\u7684\u5143\u7d20\uff08\u540c\u4e00\u5217\u4e0b\u65b9\u7684\u5143\u7d20\u66f4\u5927\uff09\u3002<\/li>\n\n\n\n<li>\u5411\u5de6\u53ef\u4ee5\u627e\u5230\u66f4\u5c0f\u7684\u5143\u7d20\uff08\u540c\u4e00\u884c\u5de6\u8fb9\u7684\u5143\u7d20\u66f4\u5c0f\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u5de6\u4e0a\u89d2\u53ea\u80fd\u4fdd\u8bc1\u53f3\u8fb9\u548c\u4e0b\u8fb9\u66f4\u5927\uff0c\u65e0\u6cd5\u76f4\u63a5\u51b3\u5b9a\u4e0b\u4e00\u6b65\u7684\u65b9\u5411\u3002<\/li>\n\n\n\n<li>\u7c7b\u4f3c\u5730\uff0c\u4e5f\u53ef\u4ee5\u9009\u62e9<strong>\u5de6\u4e0b\u89d2<\/strong>\u4f5c\u4e3a\u8d77\u70b9\uff0c\u903b\u8f91\u76f8\u53cd\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u67e5\u627e\u8fc7\u7a0b<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u521d\u59cb\u5316\uff1a<code>i = 0<\/code>\uff08\u7b2c 0 \u884c\uff09\uff0c<code>j = n<\/code>\uff08\u6700\u53f3\u4fa7\u5217\uff09\u3002<\/li>\n\n\n\n<li>\u5faa\u73af\u6761\u4ef6\uff1a<code>i &lt; m<\/code>\u00a0\u4e14\u00a0<code>j >= 0<\/code>\uff08\u672a\u8d8a\u754c\uff09\u3002<\/li>\n\n\n\n<li>\u5728\u6bcf\u4e2a\u4f4d\u7f6e\u00a0<code>(i, j)<\/code>\uff1a\n<ol class=\"wp-block-list\">\n<li>\u82e5\u00a0<code>matrix[i][j] == target<\/code>\uff0c\u8fd4\u56de\u00a0<code>true<\/code>\u3002<\/li>\n\n\n\n<li>\u82e5\u00a0<code>matrix[i][j] &lt; target<\/code>\uff0c\u5219\u76ee\u6807\u503c\u53ea\u80fd\u5728\u5f53\u524d\u884c\u7684\u4e0b\u65b9\uff0c<code>i++<\/code>\u3002<\/li>\n\n\n\n<li>\u82e5\u00a0<code>matrix[i][j] > target<\/code>\uff0c\u5219\u76ee\u6807\u503c\u53ea\u80fd\u5728\u5f53\u524d\u5217\u7684\u5de6\u4fa7\uff0c<code>j--<\/code>\u3002<\/li>\n<\/ol>\n<\/li>\n\n\n\n<li>\u5faa\u73af\u7ed3\u675f\u4ecd\u672a\u627e\u5230\uff0c\u8fd4\u56de\u00a0<code>false<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4e3e\u4f8b\u8bf4\u660e<\/strong>\uff1a<br>\u5bf9 <code>matrix = [[1,4,7,11,15],[2,5,8,12,19],[3,6,9,16,22],[10,13,14,17,24],[18,21,23,26,30]]<\/code>\uff0c<code>target = 5<\/code>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u521d\u59cb\uff1a<code>(i=0, j=4)<\/code>\u00a0\u2192\u00a0<code>matrix[0][4] = 15 > 5<\/code>\u00a0\u2192\u00a0<code>j--<\/code>\u00a0\u2192\u00a0<code>j=3<\/code><\/li>\n\n\n\n<li>\u4e0b\u4e00\u6b65\uff1a<code>(i=0, j=3)<\/code>\u00a0\u2192\u00a0<code>matrix[0][3] = 11 > 5<\/code>\u00a0\u2192\u00a0<code>j--<\/code>\u00a0\u2192\u00a0<code>j=2<\/code><\/li>\n\n\n\n<li>\u518d\u4e0b\u4e00\u6b65\uff1a<code>(i=0, j=2)<\/code>\u00a0\u2192\u00a0<code>matrix[0][2] = 7 > 5<\/code>\u00a0\u2192\u00a0<code>j--<\/code>\u00a0\u2192\u00a0<code>j=1<\/code><\/li>\n\n\n\n<li>\u518d\u4e0b\u4e00\u6b65\uff1a<code>(i=0, j=1)<\/code>\u00a0\u2192\u00a0<code>matrix[0][1] = 4 &lt; 5<\/code>\u00a0\u2192\u00a0<code>i++<\/code>\u00a0\u2192\u00a0<code>i=1<\/code><\/li>\n\n\n\n<li>\u518d\u4e0b\u4e00\u6b65\uff1a<code>(i=1, j=1)<\/code>\u00a0\u2192\u00a0<code>matrix[1][1] = 5 == target<\/code>\u00a0\u2192 \u8fd4\u56de\u00a0<code>true<\/code>\u00a0\u2705<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u8fb9\u754c\u5904\u7406<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u7a7a\u77e9\u9635\u6216\u7a7a\u884c\uff1a\u76f4\u63a5\u8fd4\u56de\u00a0<code>false<\/code>\u3002<\/li>\n\n\n\n<li>\u5355\u884c\/\u5355\u5217\uff1a\u9000\u5316\u4e3a\u4e00\u7ef4\u6709\u5e8f\u6570\u7ec4\u67e5\u627e\u95ee\u9898\u3002<\/li>\n\n\n\n<li>\u76ee\u6807\u503c\u8d85\u51fa\u77e9\u9635\u8303\u56f4\uff1a\u6700\u7ec8\u4f1a\u8df3\u51fa\u5faa\u73af\uff0c\u8fd4\u56de\u00a0<code>false<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udd17 \u641c\u7d22\u4e8c\u7ef4\u77e9\u9635 II \u9898\u76ee\u6765\u6e90\uff1a240. \u641c\u7d22\u4e8c\u7ef4\u77e9\u9635 II &#8211; \u529b\u6263\uff08LeetCode\uff09 \ud83d\udccc  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37,12],"tags":[31,49,14],"class_list":["post-337","post","type-post","status-publish","format-standard","hentry","category-matrix","category-algorithm","tag-array","tag-matrix","tag-algorithm"],"_links":{"self":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/337","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/comments?post=337"}],"version-history":[{"count":1,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/337\/revisions"}],"predecessor-version":[{"id":341,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/337\/revisions\/341"}],"wp:attachment":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/media?parent=337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/categories?post=337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/tags?post=337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}