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#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
int main()
{
int a[100][100],n,i,j,m,minim,maxim,suma=0;
ifstream f("flip.in");
ofstream g("flip.out");
f>>n>>m;
for(i=0;i<n;i++)
for(j=0;j<m;j++)
f>>a[i][j];
f.close();
for(i=0;i<n;i++)
{
minim = -65000;
maxim = 65000;
for(j=0;j<m;j++)
{
if(minim<a[i][j])
minim=a[i][j];
if(maxim>a[i][j])
maxim=a[i][j];
}
if(abs(minim)<abs(maxim))
for(j=0;j<m;j++)
a[i][j]*=-1;
}
for(i=0;i<m;i++)
{
minim = -65000;
maxim = 65000;
for(j=0;j<n;j++)
{
if(minim<a[j][i])
minim=a[j][i];
if(maxim>a[j][i])
maxim=a[j][i];
}
if(abs(minim)<abs(maxim))
for(j=0;j<n;j++)
a[j][i]=a[j][i]*-1;
}
for(i=0;i<n;i++)
for(j=0;j<m;j++)
suma+=a[i][j];
g<<suma;
g.close();
}