题解 | 单组_二维数组

#include<bits/stdc++.h>
using namespace std;
int main() {
    vector<vector<int>>nums;
    int n, m;
    long long answer = 0;
    cin >> n >> m;
    for (int i= 0; i < n ; i++) {
        vector<int>row;
        for(int j=0;j<m;j++){
            int num;
            cin>>num;
            row.push_back(num);
        }
        nums.push_back(row);
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j <m; j++) {
            answer += nums[i][j];
        }
    }
    cout<<answer<<endl;
    return 0;
}