传送门 15. 3Sum My Submissions Question Total Accepted: 108534 Total Submissions: 584814 Difficulty: Medium Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the su
Implement an iterator to flatten a 2d vector. For example,Given 2d vector = [ [1,2], [3], [4,5,6] ] By calling next repeatedly until hasNext returns false, the order of elements returned by next should be: [1,2,3,4,5,6]. Hint: How many variables do y
用STL中的vector动态开辟二维数组 源代码:#include <iostream>#include <vector>using namespace std;int main(){ int m, //行数 n; //列数 cout << "input value for m,n:"; cin>>m>>n; //注意下面这一行:vector<int后两个">"之间要有空格!否则会被认