func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename T>   inline void read(T &x) {     x = 0;     char c = getchar(), f = 0;     for (; c <  0  || c >  9 ; c = getchar())       if (c ==  - ) f = 1;     for (; c >=  0  && c <=  9 ; c = getchar())       x = (x << 1) + (x << 3) + (c ^ 48);     if (f) x = -x;   }   int vl, wh, n, nx[1005], a[1005], m;   char st[1005], dp[1005];   int main() {     read(n), read(wh);     for (int i = 1, x; i <= n; i++) read(x), x ? nx[x] = i, st[i] = 1 : 0;     for (int i = 1, c, x; i <= n; i++)       if (!st[i]) {         char tag = (c = 0) * (x = i);         while (x) c++, (x == wh ? tag = 1, vl = c : 0), x = nx[x];         if (!tag) a[++m] = c;       }     dp[0] = 1;     for (int i = 1; i <= m; i++)       for (int j = n; j >= a[i]; j--) dp[j] |= dp[j - a[i]];     for (int i = 0; i <= n; i++)       if (dp[i]) printf( %d n , i + vl);     return 0;   }   