Compilare: main.cpp:2:34: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] int g[25][250001],n,m,i,j,k;main(){std::ifstream o{"stramosi.in"};o>>n>>m;for(i=1;i<=n;++i)o>>g[0][i];for(k=1;(1<<k)<=n;++k)for(j=1;j<=n;++j)g[k][j]=g[k-1][g[k-1][j]];std::ofstream s{"stramosi.out"};while(m--){k=0;o>>i>>j;while(j){if(j&1)i=g[k][i];++k;j>>=1;}s<<i<<'\n';}} ^