{"id":713,"date":"2020-09-26T11:13:39","date_gmt":"2020-09-26T03:13:39","guid":{"rendered":"http:\/\/39.96.58.60\/?p=713"},"modified":"2022-10-18T16:38:15","modified_gmt":"2022-10-18T08:38:15","slug":"leetcode-120-%e4%b8%89%e8%a7%92%e5%bd%a2%e6%9c%80%e5%b0%8f%e8%b7%af%e5%be%84%e5%92%8c","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=713","title":{"rendered":"Leetcode 120. \u4e09\u89d2\u5f62\u6700\u5c0f\u8def\u5f84\u548c"},"content":{"rendered":"

\u7ed9\u5b9a\u4e00\u4e2a\u4e09\u89d2\u5f62\uff0c\u627e\u51fa\u81ea\u9876\u5411\u4e0b\u7684\u6700\u5c0f\u8def\u5f84\u548c\u3002\u6bcf\u4e00\u6b65\u53ea\u80fd\u79fb\u52a8\u5230\u4e0b\u4e00\u884c\u4e2d\u76f8\u90bb\u7684\u7ed3\u70b9\u4e0a\u3002<\/p>\n

\u76f8\u90bb\u7684\u7ed3\u70b9 <\/strong>\u5728\u8fd9\u91cc\u6307\u7684\u662f \u4e0b\u6807<\/code> \u4e0e \u4e0a\u4e00\u5c42\u7ed3\u70b9\u4e0b\u6807<\/code> \u76f8\u540c\u6216\u8005\u7b49\u4e8e \u4e0a\u4e00\u5c42\u7ed3\u70b9\u4e0b\u6807 + 1<\/code> \u7684\u4e24\u4e2a\u7ed3\u70b9\u3002<\/p>\n

 <\/p>\n

\u4f8b\u5982\uff0c\u7ed9\u5b9a\u4e09\u89d2\u5f62\uff1a<\/p>\n

[\n\n     [2<\/strong>],\n\n    [3<\/strong>,4],\n\n   [6,5<\/strong>,7],\n\n  [4,1<\/strong>,8,3]\n\n]\n\n<\/pre>\n
\u81ea\u9876\u5411\u4e0b\u7684\u6700\u5c0f\u8def\u5f84\u548c\u4e3a 11<\/code>\uff08\u5373\uff0c2 <\/strong>+ 3<\/strong> + 5 <\/strong>+ 1<\/strong> = 11\uff09\u3002<\/p>\n
 <\/p>\n
\u8bf4\u660e\uff1a<\/strong><\/p>\n
\u5982\u679c\u4f60\u53ef\u4ee5\u53ea\u4f7f\u7528 O<\/em>(n<\/em>) \u7684\u989d\u5916\u7a7a\u95f4\uff08n<\/em> \u4e3a\u4e09\u89d2\u5f62\u7684\u603b\u884c\u6570\uff09\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u90a3\u4e48\u4f60\u7684\u7b97\u6cd5\u4f1a\u5f88\u52a0\u5206\u3002<\/p>\n
**\u96be\u5ea6**: Medium<\/p>\n
**\u6807\u7b7e**: \u6570\u7ec4\u3001 \u52a8\u6001\u89c4\u5212\u3001<\/p>\n
\n
\n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a48 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8672.15% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a14.1 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8662.55% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u81ea\u9876\u5411\u4e0b\u53e0\u52a0\n\"\"\"\nclass Solution:\n    def minimumTotal(self, triangle: List[List[int]]) -> int:\n        n = len(triangle)\n        for i in range(1, n):\n            m = len(triangle[i])\n            for j in range(m):\n                if j-1 < 0:\n                    triangle[i][j] = triangle[i - 1][j] + triangle[i][j]\n                elif j+1 > m-1:\n                    triangle[i][j] = triangle[i-1][j-1] + triangle[i][j]\n                else:\n                    triangle[i][j] = min(triangle[i-1][j-1], triangle[i-1][j]) + triangle[i][j]\n        return min(triangle[-1])\n\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a44 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8688.51% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a14.5 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8630.46% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u81ea\u5e95\u5411\u4e0a\uff0c\u7701\u53bb\u4e86\u8fb9\u754c\u5224\u65ad\u4ee5\u53ca\u6700\u540e\u7684\u627e\u6700\u5c0f\u503c\n\"\"\"\n\nclass Solution:\n    def minimumTotal(self, triangle: List[List[int]]) -> int:\n        n = len(triangle)\n        for i in range(n-1, 0, -1):\n            for j in range(i):  # \u7b2cn\u884c\u6709n-1\u4e2a\u5143\u7d20\uff0c\n                triangle[i-1][j] = min(triangle[i][j], triangle[i][j+1]) + triangle[i-1][j] # \u4e0a\u4e00\u884c\u7684\u5143\u7d20\u7b49\u4e8e \u4e0a\u4e00\u884c\u5143\u7d20+ \u672c\u884c\u76f8\u90bb\u5143\u7d20\u7684\u6700\u5c0f\u503c\n        return triangle[0][0]<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
\u7ed9\u5b9a\u4e00\u4e2a\u4e09\u89d2\u5f62\uff0c\u627e\u51fa\u81ea\u9876\u5411\u4e0b\u7684\u6700\u5c0f\u8def\u5f84\u548c\u3002\u6bcf\u4e00\u6b65\u53ea\u80fd\u79fb\u52a8\u5230\u4e0b\u4e00\u884c\u4e2d\u76f8\u90bb\u7684\u7ed3\u70b9\u4e0a\u3002 \u76f8\u90bb\u7684\u7ed3\u70b9 \u5728\u8fd9\u91cc\u6307\u7684\u662f \u4e0b…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/713"}],"collection":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=713"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/713\/revisions"}],"predecessor-version":[{"id":714,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/713\/revisions\/714"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=713"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=713"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=713"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}