题解 | 单组_二维数组

#include <iostream>
#include <vector>

using namespace std;

int main() 
{
    int n = 0;
    int m = 0;
    long long sum = 0;
    vector< vector <int> > a;

    cin>>n>>m;
    a.resize(n);
    for (int i1 = 0;i1 <= n-1;i1++)
    {
        a[i1].resize(m);//初始化数组
    }

    for (int i2 = 0;i2 <= n-1;i2++)
    {
        for (int i3 = 0;i3 <= m-1;i3++)
        {
            cin>>a[i2][i3];
            sum += a[i2][i3];
        }
    }

    cout<<sum;
}