Compilare: main.cpp:2:88: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 2 | int n,m,v[1<<18],i,x,y,k;std::fstream f("stramosi.in");std::ofstream g("stramosi.out");main(){for(f>>n>>m;i<n;f>>v[++i],k+=v[i]==i-1);if(k==n)for(;f>>x>>y;g<<(x>=y?x-y:0)<<'\n');else for(;f>>x>>y;g<<x<<'\n')for(;x&&y--;)x=v[x];} | ^~~~