Compilare: main.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^~~~~~ main.cpp:2:36: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] int a,b,c,d,e,f,g,h,m[55][55];main(){std::ifstream s{"flip.in"};for(s>>h>>a;e<h*a;s>>m[e/a][e++%a]);for(;g++<1<<h;b>d?0:b=d)for(d=e=0;e-a;++e,d+=abs(c))for(c=f=0;f-h;c+=m[f++][e]*(g&1<<f?-1:1));std::ofstream{"flip.out"}<<b;} ^ main.cpp: In function 'int main()': main.cpp:2:94: warning: operation on 'e' may be undefined [-Wsequence-point] int a,b,c,d,e,f,g,h,m[55][55];main(){std::ifstream s{"flip.in"};for(s>>h>>a;e<h*a;s>>m[e/a][e++%a]);for(;g++<1<<h;b>d?0:b=d)for(d=e=0;e-a;++e,d+=abs(c))for(c=f=0;f-h;c+=m[f++][e]*(g&1<<f?-1:1));std::ofstream{"flip.out"}<<b;} ~^~ main.cpp:2:173: warning: operation on 'f' may be undefined [-Wsequence-point] int a,b,c,d,e,f,g,h,m[55][55];main(){std::ifstream s{"flip.in"};for(s>>h>>a;e<h*a;s>>m[e/a][e++%a]);for(;g++<1<<h;b>d?0:b=d)for(d=e=0;e-a;++e,d+=abs(c))for(c=f=0;f-h;c+=m[f++][e]*(g&1<<f?-1:1));std::ofstream{"flip.out"}<<b;} ~^~