ACM Multiply a row and add it to another

Problem Link: http://acm.epoka.edu.al:8888/en/problem-pid-c791?ps=1&smt=a&smpwid=0


#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n,m,i,j,r,c,a[505][505],s;
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    cin>>r>>c;
    for(i=1;i<=r;i++)
    {
        for(j=1;j<=c;j++)
        {
            cin>>a[i][j];
        }
    }
    cin>>n>>m>>s;
    for(i=1;i<=r;i++)
    {
        for(j=1;j<=c;j++)
        {
            if(i==m)
            {
                a[i][j]=(a[n][j]*s)+a[i][j];

            }
        }
    }
    for(i=1;i<=r;i++)
    {
        for(j=1;j<=c;j++)
        {
           cout<<a[i][j]<<" ";
        }
        cout<<endl;
    }

    return 0;

}

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