摘要:
``` class Solution { public: int subarraySum(vector& nums, int k) { int n=nums.size(),res=0; vector s(n+1,0); unordered_map hash;//记录端点i之前所有前缀和的出现情况 f 阅读全文
摘要:
``` /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode() : val(0), left(nullptr), 阅读全文