Compilare: user.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import <fstream> ^~~~~~ user.cpp:2:61: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] std::ifstream f("joc5.in");std::ofstream g("joc5.out");main(){int n,s,t,i,j;for(f>>n;n!=0;f>>n){for(i=s=0;i<n;++i)for(j=0;j<n;++j)f>>t,s^=i==j?t:0;g<<(s==0)+1<<'\n';}} ^