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Cod sursa(job #696738)
#include <cstdio>
int a[20][20];
bool valid(int x, int i){
if(x & (1 << i)) return 1;
return 0;
}
int main(){
freopen("flip.in", "r", stdin);
freopen("flip.out", "w", stdout);
int n, m; scanf("%d%d", &n, &m);
for(int i = 1; i <= n; ++ i) for(int j = 1; j <= m; ++ j) scanf("%d", &a[i][j]);
int maxi = -99999999;
for(int x = 0 ; x <= (1 << m); ++ x){
for(int i = 1; i <= (1 << m); (i <<= 1)){
if(valid (x, i)){
for(int j = 1; j <= n; ++ j)
a[j][i] *= -1;
}
}
for(int i = 1; i <= n; ++ i){
int s = 0;
for(int j = 1; j <= m; ++ j)
s += a[i][j];
if(s < 0)
for(int j = 1; j <= m; ++ j)
a[i][j] *= -1;
}
int s = 0;
for(int i = 1; i <= n; ++ i) for(int j = 1; j <= m; ++ j) s += a[i][j];
if(s > maxi) maxi = s;
}
printf("%d", maxi);
return 0;
}