{"id":2591,"date":"2022-02-04T13:14:34","date_gmt":"2022-02-04T05:14:34","guid":{"rendered":"http:\/\/139.9.1.231\/?p=2591"},"modified":"2022-02-04T13:14:34","modified_gmt":"2022-02-04T05:14:34","slug":"leetcodeday122","status":"publish","type":"post","link":"http:\/\/139.9.1.231\/index.php\/2022\/02\/04\/leetcodeday122\/","title":{"rendered":"leetcodeday122–\u4e70\u5356\u80a1\u7968\u7684\u6700\u4f73\u65f6\u673a II"},"content":{"rendered":"\n

\u7ed9\u5b9a\u4e00\u4e2a\u6570\u7ec4 prices<\/code> \uff0c\u5176\u4e2d prices[i]<\/code> \u8868\u793a\u80a1\u7968\u7b2c i<\/code> \u5929\u7684\u4ef7\u683c\u3002<\/p>\n\n\n\n

\u5728\u6bcf\u4e00\u5929\uff0c\u4f60\u53ef\u80fd\u4f1a\u51b3\u5b9a\u8d2d\u4e70\u548c\/\u6216\u51fa\u552e\u80a1\u7968\u3002\u4f60\u5728\u4efb\u4f55\u65f6\u5019 \u6700\u591a<\/strong> \u53ea\u80fd\u6301\u6709 \u4e00\u80a1<\/strong> \u80a1\u7968\u3002\u4f60\u4e5f\u53ef\u4ee5\u8d2d\u4e70\u5b83\uff0c\u7136\u540e\u5728 \u540c\u4e00\u5929<\/strong> \u51fa\u552e\u3002
\u8fd4\u56de \u4f60\u80fd\u83b7\u5f97\u7684 \u6700\u5927<\/strong> \u5229\u6da6<\/em> \u3002<\/p>\n\n\n\n

\u793a\u4f8b 1:<\/strong><\/p>\n\n\n\n

\u8f93\u5165:<\/strong> prices = [7,1,5,3,6,4]\n\u8f93\u51fa:<\/strong> 7\n\u89e3\u91ca:<\/strong> \u5728\u7b2c 2 \u5929\uff08\u80a1\u7968\u4ef7\u683c = 1\uff09\u7684\u65f6\u5019\u4e70\u5165\uff0c\u5728\u7b2c 3 \u5929\uff08\u80a1\u7968\u4ef7\u683c = 5\uff09\u7684\u65f6\u5019\u5356\u51fa, \u8fd9\u7b14\u4ea4\u6613\u6240\u80fd\u83b7\u5f97\u5229\u6da6 = 5-1 = 4 \u3002\n     \u968f\u540e\uff0c\u5728\u7b2c 4 \u5929\uff08\u80a1\u7968\u4ef7\u683c = 3\uff09\u7684\u65f6\u5019\u4e70\u5165\uff0c\u5728\u7b2c 5 \u5929\uff08\u80a1\u7968\u4ef7\u683c = 6\uff09\u7684\u65f6\u5019\u5356\u51fa, \u8fd9\u7b14\u4ea4\u6613\u6240\u80fd\u83b7\u5f97\u5229\u6da6 = 6-3 = 3 \u3002<\/code><\/pre>\n\n\n\n
\u793a\u4f8b 2:<\/strong><\/p>\n\n\n\n
\u8f93\u5165:<\/strong> prices = [1,2,3,4,5]\n\u8f93\u51fa:<\/strong> 4\n\u89e3\u91ca:<\/strong> \u5728\u7b2c 1 \u5929\uff08\u80a1\u7968\u4ef7\u683c = 1\uff09\u7684\u65f6\u5019\u4e70\u5165\uff0c\u5728\u7b2c 5 \u5929 \uff08\u80a1\u7968\u4ef7\u683c = 5\uff09\u7684\u65f6\u5019\u5356\u51fa, \u8fd9\u7b14\u4ea4\u6613\u6240\u80fd\u83b7\u5f97\u5229\u6da6 = 5-1 = 4 \u3002\n     \u6ce8\u610f\u4f60\u4e0d\u80fd\u5728\u7b2c 1 \u5929\u548c\u7b2c 2 \u5929\u63a5\u8fde\u8d2d\u4e70\u80a1\u7968\uff0c\u4e4b\u540e\u518d\u5c06\u5b83\u4eec\u5356\u51fa\u3002\u56e0\u4e3a\u8fd9\u6837\u5c5e\u4e8e\u540c\u65f6\u53c2\u4e0e\u4e86\u591a\u7b14\u4ea4\u6613\uff0c\u4f60\u5fc5\u987b\u5728\u518d\u6b21\u8d2d\u4e70\u524d\u51fa\u552e\u6389\u4e4b\u524d\u7684\u80a1\u7968\u3002<\/code><\/pre>\n\n\n\n
\u793a\u4f8b 3:<\/strong><\/p>\n\n\n\n
\u8f93\u5165:<\/strong> prices = [7,6,4,3,1]\n\u8f93\u51fa:<\/strong> 0\n\u89e3\u91ca:<\/strong> \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b, \u6ca1\u6709\u4ea4\u6613\u5b8c\u6210, \u6240\u4ee5\u6700\u5927\u5229\u6da6\u4e3a 0\u3002<\/code><\/pre>\n\n\n\n
\u6cd5\u4e00\uff1a\u8d2a\u5fc3\u7b97\u6cd5\uff1a\u53ea\u8981\u5f53\u524d\u80a1\u7968\u8d5a\u4e86\uff0c\u5c31\u5356\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
# @lc app=leetcode.cn id=122 lang=python3\r\n#\r\n# [122] \u4e70\u5356\u80a1\u7968\u7684\u6700\u4f73\u65f6\u673a II\r\n# \u52a8\u6001\u89c4\u5212\r\n# @lc code=start\r\nclass Solution:\r\n    def maxProfit(self, prices: List[int]) -> int:\r\n        ans=0\r\n        for i in range(len(prices)-1):\r\n            if prices[i] <prices[i+1]:\r\n                ans=ans+(prices[i+1]-prices[i])\r\n        return ans\r\n# @lc code=end\r\n<\/code><\/pre>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u6cd5\u4e8c\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
class Solution {\r\npublic:\r\n    int maxProfit(vector<int>& prices) {\r\n        int n = prices.size();\r\n        int dp[n][2];\r\n        dp[0][0] = 0, dp[0][1] = -prices[0];\r\n        for (int i = 1; i < n; ++i) {\r\n            dp[i][0] = max(dp[i - 1][0], dp[i - 1][1] + prices[i]);\r\n            dp[i][1] = max(dp[i - 1][1], dp[i - 1][0] - prices[i]);\r\n        }\r\n        return dp[n - 1][0];\r\n    }\r\n};<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u7ed9\u5b9a\u4e00\u4e2a\u6570\u7ec4 prices \uff0c\u5176\u4e2d prices[i] \u8868\u793a\u80a1\u7968\u7b2c&n … \u7ee7\u7eed\u9605\u8bfbleetcodeday122–\u4e70\u5356\u80a1\u7968\u7684\u6700\u4f73\u65f6\u673a II<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"_links":{"self":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2591"}],"collection":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/comments?post=2591"}],"version-history":[{"count":3,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2591\/revisions"}],"predecessor-version":[{"id":2597,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2591\/revisions\/2597"}],"wp:attachment":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/media?parent=2591"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/categories?post=2591"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/tags?post=2591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}