Compilare: main.cpp: In function 'int main()': main.cpp:2:218: warning: operation on 'j' may be undefined [-Wsequence-point] using namespace std;ifstream fin("stramosi.in");ofstream fout("stramosi.out");int d[19][250004];int n,m,i,a,b,j;int main(){fin>>n>>m;for(i=1;i<=n;) fin>>d[0][i++];for(i=0;i<18;i++) for(j=1;j<=n;) d[i+1][j]=d[i][d[i][j++]];for(;m--;){fin>>a>>b;j=0;while(b) b&(1<<j)?a=d[j][a],b-=(1<<j):0,j++;fout<<a<<"\n";}} ~^~