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int rowWithMax1s(vector<vector<int>> &matrix, int n, int m)
{
// Write your code here.
int ans = 0, res = -1;
for(int i =0;i<n;i++)
{ int row = 0;
for(int j =0;j<m;j++)
{
if(matrix[i][j]==1)
row ++;
}
if(row>ans) res = i;
ans = max(ans, row);
}
return res;
}