{"id":587,"date":"2020-09-26T11:00:29","date_gmt":"2020-09-26T03:00:29","guid":{"rendered":"http:\/\/39.96.58.60\/?p=587"},"modified":"2022-10-18T16:38:45","modified_gmt":"2022-10-18T08:38:45","slug":"leetcode-279-%e5%ae%8c%e5%85%a8%e5%b9%b3%e6%96%b9%e6%95%b0","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=587","title":{"rendered":"Leetcode 279. \u5b8c\u5168\u5e73\u65b9\u6570"},"content":{"rendered":"<p>\u7ed9\u5b9a\u6b63\u6574\u6570&nbsp;<em>n<\/em>\uff0c\u627e\u5230\u82e5\u5e72\u4e2a\u5b8c\u5168\u5e73\u65b9\u6570\uff08\u6bd4\u5982&nbsp;<code>1, 4, 9, 16, ...<\/code>\uff09\u4f7f\u5f97\u5b83\u4eec\u7684\u548c\u7b49\u4e8e<em> n<\/em>\u3002\u4f60\u9700\u8981\u8ba9\u7ec4\u6210\u548c\u7684\u5b8c\u5168\u5e73\u65b9\u6570\u7684\u4e2a\u6570\u6700\u5c11\u3002<\/p>\n<p><strong>\u793a\u4f8b&nbsp;1:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> <em>n<\/em> = <code>12<\/code>\n\n<strong>\u8f93\u51fa:<\/strong> 3 \n\n<strong>\u89e3\u91ca: <\/strong><code>12 = 4 + 4 + 4.<\/code><\/pre>\n<p><strong>\u793a\u4f8b 2:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> <em>n<\/em> = <code>13<\/code>\n\n<strong>\u8f93\u51fa:<\/strong> 2\n\n<strong>\u89e3\u91ca: <\/strong><code>13 = 4 + 9.<\/code><\/pre>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u5e7f\u5ea6\u4f18\u5148\u641c\u7d22\u3001 \u6570\u5b66\u3001 \u52a8\u6001\u89c4\u5212\u3001<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism undefined-numbers lang-python\" data-lang=\"Python\"><code>\n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a208 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8686.90% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.7 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8679.52% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u8d2a\u5fc3\u7b97\u6cd5\n    \u53c2\u8003\u4e86\u5b98\u65b9\u601d\u8def\uff1a  https:\/\/leetcode-cn.com\/problems\/perfect-squares\/solution\/wan-quan-ping-fang-shu-by-leetcode\/\n\n    \u628a\u4e00\u4e2a\u6570\uff0c\u62c6\u6210\uff0c\u5b8c\u5168\u5e73\u65b9\u6570\uff0c\u8981\u6c42\u7ec4\u6210\u7684\u6570\u7684\u6570\u91cf\u6700\u5c11\n    \u6539\u4e3a\u6c42\u4e00\u4e2a\u6570\uff0c\u53ef\u4e0d\u53ef\u4ee5\u7531count\u4e2a \u5b8c\u5168\u5e73\u65b9\u6570\u7ec4\u6210\n    \u7531\u6b64\u5f97\u5230\u8be5\u6570\u7684\u6700\u5c11\u7684\u5b8c\u5168\u5e73\u65b9\u6570\u6570\u91cf\n\n    \u5177\u4f53\u601d\u8def\u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\nclass Solution:\n    def numSquares(self, n: int) -&gt; int:\n        def f(num, count):  # \u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\uff0c\u5982 num \u53ef\u4ee5\u7531count\u4e2a\u5b8c\u5168\u5e73\u65b9\u6570\u7ec4\u6210\uff0c\u5219\u8fd4\u56deTrue\n            if count == 1:\n                return num in square_nums   # \u5355\u4e2a\u5b8c\u5168\u5e73\u65b9\u6570\u6784\u6210\u7684\u6570\uff0c\u4e5f\u5728\u5b8c\u5168\u5e73\u65b9\u6570\u91cc\n\n            for k in square_nums:       # \u5f53\u524d\u6570\uff0c\u51cf\u53bb\u4e00\u4e2a\u5b8c\u5168\u5e73\u65b9\u6570\u540e\uff0c\u770b\u662f\u5426\u53ef\u4ee5\u7531 count-1\u4e2a \u5b8c\u5168\u5e73\u65b9\u6570\u6784\u6210\n                if f(num-k, count-1):\n                    return True\n            return False\n\n        square_nums = [i**2 for i in range(1, int(n**0.5)+1)]   # \u5b8c\u5168\u5e73\u65b9\u6570\n        for count in range(1, n + 1):   # \u4ece 1 \u5230n\uff0c\u770b\u53ef\u4ee5\u7531\u591a\u5c11\u4e2a\u5b8c\u5168\u5e73\u65b9\u6570\u6784\u6210\u3002\n            if f(n, count):\n                return count<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u6b63\u6574\u6570&nbsp;n\uff0c\u627e\u5230\u82e5\u5e72\u4e2a\u5b8c\u5168\u5e73\u65b9\u6570\uff08\u6bd4\u5982&nbsp;1, 4, 9, 16, &#8230;\uff09\u4f7f\u5f97\u5b83\u4eec\u7684\u548c&#8230;<\/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\/587"}],"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=587"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/587\/revisions"}],"predecessor-version":[{"id":588,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/587\/revisions\/588"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=587"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}