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Cod sursa(job #265777)
#include<stdio.h>
long mat[16][16];
long max =-1099999999;
int sol[16];
int n,m;
void citire()
{
freopen("flip.in","r",stdin);
scanf("%d",&n);
scanf("%d",&m);
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
scanf("%ld",&mat[i][j]);
}
long suma_col(int col)
{
long s=0;int x;
for(int i=1;i<=n;i++)
{if(sol[i])x=-1;else x=1;s+=mat[i][col]*x;}
if(s>0)return s;
else return -s;
}
void do_max()
{
int i;
long max2=-1099999999;
for(i=1;i<=m;i++)
max2+=suma_col(i);
if(max2>max)max=max2;
}
int add2sol()
{
int poz=1;
while(sol[poz]!=0)
sol[poz++]=0;
sol[poz]=1;
return poz<=n+1;
}
int main()
{
freopen("flip.out","w",stdout);
citire();
while(add2sol())do_max();
printf("%ld",max);
return 0;
}