[英]What is the efficient way to take 2d vector input in c++?
3 //number of lines
1 2
2 1
4 5
I want to store the n lines as a 2d vector, what is the best way to do it?我想将 n 行存储为 2d 向量,最好的方法是什么?
int t;
cin>>t;
std::vector<std::vector<int>> Vec(t, std::vector<int>(2, 0)); // replace zero with some value if you wanna intiallize vector.
for(int i=0; i<t; i++){
for(int j=0; j<2; j++{
cin>>Vec[i][j];
}
}
this is the way i always intiallize a 2d vector and take input.这就是我总是初始化一个二维向量并接受输入的方式。 I feel there is nothing more efficient.我觉得没有比这更有效的了。
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