#include <cstdio> #include <iostream> #include<cmath> using namespace std; const int N = 1e5 + 10; int f[N]; int step[N]; int main() { ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int cur,to; scanf("%d%d",&cur,&to); step[cur] = 1; for(int i = cur...