{"id":2916,"date":"2020-02-10T18:37:15","date_gmt":"2020-02-10T10:37:15","guid":{"rendered":"http:\/\/www.sniper97.cn\/?p=2916"},"modified":"2020-02-10T18:37:15","modified_gmt":"2020-02-10T10:37:15","slug":"%e3%80%90leetcode%e3%80%910046-%e5%85%a8%e6%8e%92%e5%88%97","status":"publish","type":"post","link":"http:\/\/www.sniper97.cn\/index.php\/note\/algorithm\/2916\/","title":{"rendered":"\u3010LeetCode\u30110046 \u5168\u6392\u5217"},"content":{"rendered":"\n

https:\/\/leetcode-cn.com\/problems\/permutations\/<\/a><\/p>\n\n\n

# -*- coding:utf-8 -*-\n<\/em>class Solution(object):\n    def permute(self, nums):\n        def backtrack(i, flag_list, temp_list=[]):\n            if i == n:\n                output.append(temp_list)\n                return\n            # \u627e\u5230\u7b2c\u4e00\u4e2a\u53ef\u7528\u6570\u5b57\n            for j in range(len(flag_list)):\n                if flag_list[j] != 0:\n                    flag_list[j] = 0\n                    temp_list.append(nums[j])\n                    backtrack(i + 1, flag_list[:], temp_list[:])\n                    flag_list[j] = 1\n                    temp_list = temp_list[:-1]\n        n = len(nums)\n        output = []\n        flag_list = [1 for _ in range(n)]\n        backtrack(0, flag_list)\n        return output\nif __name__ == '__main__':\n    nums = [1, 2, 3]\n    print(Solution().permute1(nums))\n<\/pre>\n\n\n
\u601d\u8def<\/strong>\uff1a\u56de\u6eaf\u6cd5\uff0c\u9996\u5148\u9009\u62e9\u4e00\u4e2a\u6570\u5b57\uff0c\u7136\u540e\u5411\u4e0b\u9012\u5f52\u4e0b\u4e00\u4f4d\u548c\u5f53\u524d\u53ef\u9009\u6570\u5b57\uff0c\u5982\u679c\u6ee1\u8db3\u6761\u4ef6\u5c31\u6dfb\u52a0\u5230\u8f93\u51fa\u5217\u8868\u4e2d\uff0c\u7136\u540e\u56de\u6eaf\uff0c\u56de\u6eaf\u7684\u64cd\u4f5c\u5305\u62ec\u5c06\u4f7f\u7528\u6807\u8bb0\u4ece0\u53d8\u4e3a1\uff0c\u5c06\u5f53\u524d\u4e34\u65f6\u7ed3\u679c\u5217\u8868\u4e2d\u5254\u9664\u6700\u540e\u4e00\u4e2a\u6570\u5b57\u3002<\/p>\n\n\n
\u601d\u8003<\/strong>\uff1a\u6709\u4e00\u4e2a\u4e0d\u7528\u6807\u8bb0\u5217\u8868\u7684\u65b9\u6cd5\uff0c\u5c31\u662f\u5411\u540e\u4ea4\u6362\uff0c\u56e0\u4e3a\u662f\u4ea4\u6362\uff0c\u4e5f\u7701\u53bb\u4e86\u4e34\u65f6\u5217\u8868\u7b49\u7a7a\u95f4\uff0c\u4f46\u662f\u5b9e\u9645\u63d0\u4ea4\u548c\u4e0a\u4e00\u4e2a\u65b9\u6cd5\u76f8\u6bd4\u8f83\uff0c\u7a7a\u95f4\u4e0a\u5e76\u6ca1\u6709\u533a\u522b\uff0c\u53cd\u800c\u662f\u65f6\u95f4\u4e0a\u6709\u4e86\u533a\u522b\uff0c\u6211\u4e5f\u4e0d\u662f\u5f88\u61c2\u4e3a\u5565\u3002<\/p>\n\n\n
\u4f7f\u7528\u4ea4\u6362\u6765\u6a21\u62df\u6bcf\u6b21\u5bfb\u627e\u53ef\u7528\u6570\u5b57\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff0c1\uff0c2\uff0c3\uff0c4\u8fd9\u4e2a\u5217\u8868\uff0c\u5982\u679c\u6211\u4eec\u5904\u7406\u7b2c\u4e00\u4f4d\u65f6\uff0c1\uff0c2\uff0c3\uff0c4\u90fd\u662f\u53ef\u7528\u6570\u5b57\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u75281\u5206\u522b\u4e0e\u540e\u9762\u7684\u6570\u5b57\u8fdb\u884c\u4ea4\u6362\uff0c\u8fd9\u6837idx0\u5c31\u5206\u522b\u53d6\u5230\u4e86\u6240\u6709\u6570\u5b57\u3002\u5f53\u56fa\u5b9a\u4e861\u65f6\uff0c\u6211\u4eec\u7ee7\u7eed\u5206\u67902\uff0c3\uff0c4\uff0c\u4f9d\u7136\u662f\u4ea4\u6362\uff0c\u8fd9\u6837\u53ef\u4ee5\u56fa\u5b9a\u65b0\u7684idx0\uff08\u4e5f\u5c31\u662f\u65e7\u5217\u8868\u7684idx1\uff09\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002<\/p>\n\n\n
    def permute1(self, nums):
        \"\"\"
        <\/em>:type<\/em><\/strong> nums: List[int]
        <\/em>:rtype<\/em><\/strong>: List[List[int]]
        \"\"\"

        <\/em>def backtrack(first=0):
            if first == n:
                output.append(nums[:])
            for i in range(first, n):
                # \u8fd9\u91cc\u4f7f\u7528\u4ea4\u6362\u6765\u6a21\u62df\u9012\u5f52\u5176\u4f59\u6570\u5b57\uff08\u6bd4\u59821,2,3\u3002 \u4ea4\u63621 2   13  \u5c31\u6a21\u62df\u4e86\u7b2c\u4e00\u4e2a\u4f4d\u7f6e\u7684\u5168\u90e8\u53ef\u80fd\uff09
                nums[first], nums[i] = nums[i], nums[first]
                backtrack(first + 1)
                nums[first], nums[i] = nums[i], nums[first]

        n = len(nums)
        output = []
        backtrack()
        return output<\/pre>\n","protected":false},"excerpt":{"rendered":"
https:\/\/leetcode-cn.com\/problems\/permutations\/ # – […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[10],"tags":[],"views":1679,"_links":{"self":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/2916"}],"collection":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2916"}],"version-history":[{"count":0,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/2916\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2916"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2916"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}