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Cod sursa(job #319187)
#include<stdio.h>
int a[17][17],i,x,j,n,s,smax,m,c[17][17],s1;
char b[17];
void verifical()
{ s=0;
for(j=1;j<=m;j++)
if(b[j-1]!='0') for(i=1;i<=n;i++) c[i][j]=-a[i][j];
else for(i=1;i<=n;i++) c[i][j]=a[i][j];
for(i=1;i<=n;i++) { s1=0;
for(j=1;j<=m;j++) s1+=c[i][j];
if(s1>0) s+=s1;
else s-=s1;
}
if(s>smax)smax=s;
}
int gencodc(int i1)
{ if(i1==m) verifical();
else { b[i1]='0'; gencodc(i1+1);
b[i1]='1'; gencodc(i1+1);
}
return 0;
}
int main()
{ freopen("flip.in","r",stdin);
freopen("flip.out","w",stdout);
scanf("%d %d",&n,&m);
for(i=1;i<=n;i++)
for(j=1;j<=m;j++) scanf("%d",&a[i][j]),smax+=a[i][j];
gencodc(0);
printf("%d\n",smax);
fclose(stdin);
fclose(stdout);
return 0;
}