Compilare: user.cpp:2:15: warning: multi-character character constant [-Wmultichar] int64_t N,x,d['ྞ'],i,j;main(){std::ifstream f("diagonale.in");std::ofstream g("diagonale.out");for(f>>N;N/++i;)for(j=1;N/j;f>>x,d[i+j]+=x,d[3*N+i-j++]+=x);for(i=2;i<4*N;x=std::max(x,d[i++]));g<<x;} ^ user.cpp:2:31: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] int64_t N,x,d['ྞ'],i,j;main(){std::ifstream f("diagonale.in");std::ofstream g("diagonale.out");for(f>>N;N/++i;)for(j=1;N/j;f>>x,d[i+j]+=x,d[3*N+i-j++]+=x);for(i=2;i<4*N;x=std::max(x,d[i++]));g<<x;} ^