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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
int main()
{
unsigned int N, M, i, j;
fin>>N>>M;
int tabla[N][M], suma = 0, suma1, copietabla[N][M];
for(i = 0; i < N; i++)
for(j = 0; j < M; j++){
fin>>tabla[i][j];
copietabla[i][j] = tabla[i][j];
}
for(i = 0; i < N; i++){
suma = 0;
for(j = 0; j < M; j++){
suma += tabla[i][j];
}
if(suma < 0){
/*suma *= -1;
for(j = 0; j < M; j++){
if(-tabla[i][j] < 0)
suma -= tabla[i][j];
}
if(suma > 0){*/
for(j = 0; j < M; j++)
tabla[i][j] *= -1;
cout<<"am inversat linia "<<i+1<<endl;
// }
}
}
for(j = 0; j < M; j++){
suma = 0;
for(i = 0; i < N; i++){
suma += tabla[i][j];
}
if(suma < 0){
/*suma *= -1;
for(i = 0; i < N; i++){
if(-tabla[i][j] < 0)
suma -= tabla[i][j];
}
if(suma > 0){*/
for(i = 0; i < N; i++)
tabla[i][j] *= -1;
cout<<"am inversat coloana "<<j+1<<endl;
// }
}
}
for(i = 0, suma = 0; i < N; i++)
for(j = 0; j < M; j++)
suma += copietabla[i][j];
suma1 = suma;
for(j = 0; j < M; j++){
suma = 0;
for(i = 0; i < N; i++){
suma += copietabla[i][j];
}
if(suma < 0){
for(i = 0; i < N; i++)
copietabla[i][j] *= -1;
}
}
for(i = 0; i < N; i++){
suma = 0;
for(j = 0; j < M; j++){
suma += copietabla[i][j];
}
if(suma < 0){
for(j = 0; j < M; j++)
copietabla[i][j] *= -1;
}
}
for(i = 0, suma = 0; i < N; i++)
for(j = 0; j < M; j++)
suma += copietabla[i][j];
fout<<max(suma, suma1);
}