in this Problem https://mirror.codeforces.com/contest/1829/problem/E
I Got a runTime Error because of this way of resizing my vector
grid.resize(n, vector(m));
but when I used this
grid = vector<vector>(n, vector(m));
it worked ?! What is the difference?
https://mirror.codeforces.com/contest/1829/submission/205458152 => Runtime Error
https://mirror.codeforces.com/contest/1829/submission/205697075 => Acc