{"id":1001,"date":"2025-12-18T01:25:46","date_gmt":"2025-12-17T17:25:46","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=1001"},"modified":"2025-12-18T01:25:46","modified_gmt":"2025-12-17T17:25:46","slug":"leetcode-121-%e4%b9%b0%e5%8d%96%e8%82%a1%e7%a5%a8%e7%9a%84%e6%9c%80%e4%bd%b3%e6%97%b6%e6%9c%ba","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=1001","title":{"rendered":"LeetCode 121 – \u4e70\u5356\u80a1\u7968\u7684\u6700\u4f73\u65f6\u673a"},"content":{"rendered":"

\u9898\u76ee\u63cf\u8ff0<\/h1>\n

\u7ed9\u5b9a\u4e00\u4e2a\u6570\u7ec4 prices \uff0c\u5b83\u7684\u7b2c i \u4e2a\u5143\u7d20 prices[i] \u8868\u793a\u4e00\u652f\u7ed9\u5b9a\u80a1\u7968\u7b2c i \u5929\u7684\u4ef7\u683c\u3002
\n\u4f60\u53ea\u80fd\u9009\u62e9 \u67d0\u4e00\u5929 \u4e70\u5165\u8fd9\u53ea\u80a1\u7968\uff0c\u5e76\u9009\u62e9\u5728 \u672a\u6765\u7684\u67d0\u4e00\u4e2a\u4e0d\u540c\u7684\u65e5\u5b50 \u5356\u51fa\u8be5\u80a1\u7968\u3002\u8bbe\u8ba1\u4e00\u4e2a\u7b97\u6cd5\u6765\u8ba1\u7b97\u4f60\u6240\u80fd\u83b7\u53d6\u7684\u6700\u5927\u5229\u6da6\u3002
\n\u8fd4\u56de\u4f60\u53ef\u4ee5\u4ece\u8fd9\u7b14\u4ea4\u6613\u4e2d\u83b7\u53d6\u7684\u6700\u5927\u5229\u6da6\u3002\u5982\u679c\u4f60\u4e0d\u80fd\u83b7\u53d6\u4efb\u4f55\u5229\u6da6\uff0c\u8fd4\u56de 0 \u3002<\/p>\n

\u793a\u4f8b\uff1a
\n\u8f93\u5165\uff1a[7,1,5,3,6,4]
\n\u8f93\u51fa\uff1a5
\n\u89e3\u91ca\uff1a\u5728\u7b2c 2 \u5929\uff08\u80a1\u7968\u4ef7\u683c = 1\uff09\u7684\u65f6\u5019\u4e70\u5165\uff0c\u5728\u7b2c 5 \u5929\uff08\u80a1\u7968\u4ef7\u683c = 6\uff09\u7684\u65f6\u5019\u5356\u51fa\uff0c\u6700\u5927\u5229\u6da6 = 6-1 = 5 \u3002
\n \u6ce8\u610f\u5229\u6da6\u4e0d\u80fd\u662f 7-1 = 6, \u56e0\u4e3a\u5356\u51fa\u4ef7\u683c\u9700\u8981\u5927\u4e8e\u4e70\u5165\u4ef7\u683c\uff1b\u540c\u65f6\uff0c\u4f60\u4e0d\u80fd\u5728\u4e70\u5165\u524d\u5356\u51fa\u80a1\u7968\u3002<\/p>\n

\u9898\u76ee\u5206\u6790<\/h1>\n

\u5047\u8bbe\u5356\u51fa\u4ef7\u683c\u56fa\u5b9a\uff0c\u5219\u4e70\u5165\u4ef7\u683c\u8d8a\u4f4e\uff0c\u5229\u6da6\u8d8a\u9ad8\u3002
\n\u904d\u5386\u4e00\u8fb9\u6570\u7ec4\uff0c\u7ef4\u62a4\u5386\u53f2\u6700\u4f4e\u4ef7\u683c min\uff0c\u540c\u65f6\u4ee5\u5f53\u524d\u4ef7\u683c\u4f5c\u4e3a\u5356\u51fa\u4ef7\u683c\uff0c\u8ba1\u7b97\u5229\u6da6\u3002<\/p>\n

Java<\/h1>\n
public int maxProfit(int[] prices) {\n    int min = prices[0], ans = 0;\n    for (int price : prices) {\n        ans = Math.max(ans, price - min);\n        min = Math.min(min, price);\n    }\n    return ans;\n}\n<\/code><\/pre>\n
Kotlin<\/h1>\n
fun maxProfit(prices: IntArray): Int {\n    var min = prices[0]\n    var ans = 0\n    for (num in prices) {\n        ans = max(ans, num - min)\n        min = min(min, num)\n    }\n    return ans\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee\u63cf\u8ff0 \u7ed9\u5b9a\u4e00\u4e2a\u6570\u7ec4 prices \uff0c\u5b83\u7684\u7b2c i \u4e2a\u5143\u7d20 prices[i] \u8868\u793a\u4e00\u652f\u7ed9\u5b9a\u80a1\u7968\u7b2c i \u5929\u7684\u4ef7 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[20,40],"class_list":["post-1001","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-40"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1001","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1001"}],"version-history":[{"count":1,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1001\/revisions"}],"predecessor-version":[{"id":1002,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1001\/revisions\/1002"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1001"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1001"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}