{"id":54,"date":"2022-02-10T14:25:04","date_gmt":"2022-02-10T06:25:04","guid":{"rendered":"https:\/\/blog.zjia.me\/?p=54"},"modified":"2026-06-19T18:03:07","modified_gmt":"2026-06-19T10:03:07","slug":"1-%e4%b8%a4%e6%95%b0%e4%b9%8b%e5%92%8c","status":"publish","type":"post","link":"https:\/\/blog.ttwow.top\/?p=54","title":{"rendered":"1. \u4e24\u6570\u4e4b\u548c"},"content":{"rendered":"<p>\u9898\u76ee\u63cf\u8ff0<br \/>\n\u7ed9\u5b9a\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums \u548c\u4e00\u4e2a\u76ee\u6807\u503c target\uff0c\u8bf7\u4f60\u5728\u8be5\u6570\u7ec4\u4e2d\u627e\u51fa\u548c\u4e3a\u76ee\u6807\u503c\u7684\u90a3 \u4e24\u4e2a \u6574\u6570\uff0c\u5e76\u8fd4\u56de\u4ed6\u4eec\u7684\u6570\u7ec4\u4e0b\u6807\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u5047\u8bbe\u6bcf\u79cd\u8f93\u5165\u53ea\u4f1a\u5bf9\u5e94\u4e00\u4e2a\u7b54\u6848\u3002\u4f46\u662f\uff0c\u4f60\u4e0d\u80fd\u91cd\u590d\u5229\u7528\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u540c\u6837\u7684\u5143\u7d20\u3002<\/p>\n<p>\u793a\u4f8b:<\/p>\n<p>\u7ed9\u5b9a nums = [2, 7, 11, 15], target = 9<\/p>\n<p>\u56e0\u4e3a nums[0] + nums[1] = 2 + 7 = 9<br \/>\n\u6240\u4ee5\u8fd4\u56de [0, 1]<\/p>\n<p>\u601d\u8def<br \/>\n\u6700\u5bb9\u6613\u60f3\u5230\u7684\u5c31\u662f\u66b4\u529b\u679a\u4e3e\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u4e24\u5c42 for \u5faa\u73af\u6765\u904d\u5386\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u67e5\u627e\u6ee1\u8db3\u6761\u4ef6\u7684\u76ee\u6807\u5143\u7d20\u3002<\/p>\n<p>\u4f2a\u4ee3\u7801\uff1a<\/p>\n<p>for(int i = 0; i &lt; n; i++) {<br \/>\nfor(int j = 0; j &lt; i;j ++){<br \/>\nif (nums[i] + nums[j] == target) return [j, i]<br \/>\n}<br \/>\n}<br \/>\n\u4e0d\u8fc7\u8fd9\u6837\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(N^2)\uff0c\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a O(1)\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u8f83\u9ad8\uff0c\u6211\u4eec\u8981\u60f3\u529e\u6cd5\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n<p>\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u589e\u52a0\u4e00\u4e2a Map \u8bb0\u5f55\u5df2\u7ecf\u904d\u5386\u8fc7\u7684\u6570\u5b57\u53ca\u5176\u5bf9\u5e94\u7684\u7d22\u5f15\u503c\u3002\u8fd9\u6837\u5f53\u904d\u5386\u4e00\u4e2a\u65b0\u6570\u5b57\u7684\u65f6\u5019\u5c31\u53bb Map \u91cc\u67e5\u8be2 target \u4e0e\u8be5\u6570\u7684\u5dee\u503c diff \u662f\u5426\u5df2\u7ecf\u5728\u524d\u9762\u7684\u6570\u5b57\u4e2d\u51fa\u73b0\u8fc7\u3002\u5982\u679c\u51fa\u73b0\u8fc7\uff0c\u8bf4\u660e diff + \u5f53\u524d\u6570 = target\uff0c\u6211\u4eec\u5c31\u627e\u5230\u4e86\u4e00\u7ec4\u7b54\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\u63cf\u8ff0 \u7ed9\u5b9a\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums \u548c\u4e00\u4e2a\u76ee\u6807\u503c target\uff0c\u8bf7\u4f60\u5728\u8be5\u6570\u7ec4\u4e2d\u627e\u51fa\u548c\u4e3a\u76ee\u6807\u503c\u7684\u90a3 \u4e24\u4e2a \u6574\u6570 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[136],"tags":[51,103],"class_list":["post-54","post","type-post","status-publish","format-standard","hentry","category-notes-misc","tag-leetcode","tag-103"],"_links":{"self":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts\/54","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=54"}],"version-history":[{"count":1,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts\/54\/revisions"}],"predecessor-version":[{"id":2029,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts\/54\/revisions\/2029"}],"wp:attachment":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=54"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=54"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=54"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}