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#include <iostream>
#include <cstdio>
using namespace std;
int matr[17][17], n, m;
int coloana(int m)
{
int poz = 0, neg = 0;
for(int i = 0; i < n; i++)
{
if(matr[i][m] >= 0) poz += matr[i][m];
else neg += matr[i][m] * (-1);
}
if(neg > poz)
{
cout << "coloana: " << m + 1 << endl;
for(int i = 0; i < n; i++)
{
matr[i][m] *= -1;
}
}
}
int linie(int n)
{
int poz = 0, neg = 0;
for(int i = 0; i < m; i++)
{
if(matr[n][i] >= 0) poz += matr[n][i];
else neg += matr[n][i] * (-1);
}
if(neg > poz)
{
cout << "linie: " << n + 1 << endl;
for(int i = 0; i < m; i++)
{
matr[n][i] *= -1;
}
}
}
int main()
{
freopen("flip.in", "r", stdin);
freopen("flip.out", "w", stdout);
cin >> n >> m;
int s = 0;
for(int i = 0; i < n; i++)
{
for(int j = 0; j < m; j++)
{
cin >> matr[i][j];
}
}
for(int i = 0; i < m; i++)
{
coloana(i);
}
for(int i = 0; i < n; i++)
{
linie(i);
}
for(int i = 0; i < n; i++)
{
for(int j = 0; j < m; j++)
{
s += matr[i][j];
}
cout << endl;
}
cout << s;
}