题解 | 矩阵转置

#include <iostream>
#include<vector>
using namespace std;
#define ll long long
int main() {
    int n,m;
    cin>>n>>m;
    vector<vector<ll>>a(n,vector<ll>(m));
    vector<vector<ll>>b(m,vector<ll>(n));
    for(int i=0;i<n;++i){
        for(int j=0;j<m;j++){
            cin>>a[i][j];
            b[j][i]=a[i][j];
        }
    }
    for(int i=0;i<m;i++){
        bool sign=false; 
        for(int j=0;j<n;j++){
            if(sign)cout<<" ";
            cout<<b[i][j];
            sign=true;
        }
        cout<<endl;
    }
    return 0;
}