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46. 全排列 排列，用回溯法 class Solution { public: vector<vector<int>> permute(vector<int>& nums) { vector<vector<int>> permutation; vector<bool> visited(nums.s 阅读全文
摘要：
17. 电话号码的字母组合 排列题目，很容易想到回溯。下面是ac代码。 class Solution { private: vector<string> vstrs = {"","","abc","def","ghi","jkl","mno","pqrs","tuv","wxyz"}; public 阅读全文