{"id":192,"date":"2020-10-12T11:41:45","date_gmt":"2020-10-12T03:41:45","guid":{"rendered":"http:\/\/zhuxinyong.com\/?p=192"},"modified":"2021-07-19T08:19:44","modified_gmt":"2021-07-19T00:19:44","slug":"leetcode-%e4%b8%a4%e6%95%b0%e4%b9%8b%e5%92%8c","status":"publish","type":"post","link":"https:\/\/zhuxinyong.com\/?p=192","title":{"rendered":"LeetCode&#8211;\u4e24\u6570\u4e4b\u548c"},"content":{"rendered":"\n<p><strong><a href=\"https:\/\/leetcode-cn.com\/problems\/two-sum\/\" target=\"_blank\" rel=\"noopener\">\u9898\u76ee\u63cf\u8ff0\uff1a<\/a><\/strong><\/p>\n\n\n\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums&nbsp;\u548c\u4e00\u4e2a\u76ee\u6807\u503c target\uff0c\u8bf7\u4f60\u5728\u8be5\u6570\u7ec4\u4e2d\u627e\u51fa\u548c\u4e3a\u76ee\u6807\u503c\u7684\u90a3&nbsp;\u4e24\u4e2a&nbsp;\u6574\u6570\uff0c\u5e76\u8fd4\u56de\u4ed6\u4eec\u7684\u6570\u7ec4\u4e0b\u6807\u3002<\/p>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u5047\u8bbe\u6bcf\u79cd\u8f93\u5165\u53ea\u4f1a\u5bf9\u5e94\u4e00\u4e2a\u7b54\u6848\u3002\u4f46\u662f\uff0c\u6570\u7ec4\u4e2d\u540c\u4e00\u4e2a\u5143\u7d20\u4e0d\u80fd\u4f7f\u7528\u4e24\u904d\u3002<\/p>\n\n\n\n<p class=\"has-text-align-justify\">\u793a\u4f8b:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\u7ed9\u5b9a nums = [2, 7, 11, 15], target = 9\n\u56e0\u4e3a nums[0] + nums[1] = 2 + 7 = 9\n\u6240\u4ee5\u8fd4\u56de [0, 1]<\/pre>\n\n\n\n<p>\u89e3\u9898\uff1a<\/p>\n\n\n\n<p>1.\u679a\u4e3e<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var twoSum = function(nums, target) {\n  let arr = [],\n    len = nums.length\n\n  for(let i = 0; i &lt; len - 1; i++){\n    for(let j = i+1; j&lt; len; j++){\n      if((nums[i] + nums[j]) == target){\n        arr.push(i,j)\n      }\n    }\n  }\n  return arr\n};<\/pre>\n\n\n\n<p>\u7f3a\u70b9\uff1a1.\u53cc\u91cd\u5faa\u73af\u5219\u65f6\u95f4\u590d\u6742\u5ea6 \u4e3aO(N\u00b2)<\/p>\n\n\n\n<p>2. Map \u6216\u8005 \u5bf9\u8c61\uff08{}\uff09<\/p>\n\n\n\n<p>\u51cf\u5c11\u67e5\u8be2\u65f6\u95f4\uff0c\u901a\u8fc7key,val\u6a21\u5f0f\u5feb\u901f\u5b9a\u4f4d\u5c06\u65f6\u95f4\u590d\u6742\u5ea6\u964d\u5230 O(1)\uff0c\u4f46\u662f\u8fd9\u9898\u65f6\u95f4\u590d\u6742\u5ea6\u53ef\u4ee5\u4e3aO(N)<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">let twoSum = function(nums, target){\n  let len = nums.length,\n    numMap = new Map()\n\n  for(let i = 0; i &lt; len;i++){\n    if(numMap.has(target - nums[i])){\n      return [numMap.get(target - nums[i]),i]\n    }\n    numMap.set(nums[i],i)\n  }\n}<\/pre>\n\n\n\n<p>\u540c\u6837\u7a7a\u95f4\u590d\u6742\u5ea6\u63d0\u9ad8\u5230\u4e86O(N)\uff0c\u901a\u8fc7\u7a7a\u95f4\u6362\u65f6\u95f4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\u63cf\u8ff0\uff1a \u7ed9\u5b9a\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums&nbsp;\u548c\u4e00\u4e2a\u76ee\u6807\u503c target\uff0c\u8bf7\u4f60\u5728\u8be5\u6570\u7ec4\u4e2d\u627e\u51fa\u548c\u4e3a&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,3,29],"tags":[8],"class_list":["post-192","post","type-post","status-publish","format-standard","hentry","category-all","category-tech","category-alg","tag-leetcode"],"_links":{"self":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/192","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=192"}],"version-history":[{"count":1,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/192\/revisions"}],"predecessor-version":[{"id":304,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/192\/revisions\/304"}],"wp:attachment":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}