解：

首个题解，欢迎参考

#include <iostream>
#include <vector>
using namespace std;
int main() {
    int n, d;
    cin >> n >> d;
    vector<int> parent(n + 1, 0);  
    for (int i = 2; i <= n; ++i) {
        cin >> parent[i];
    }
    for (int i = 1; i <= n; ++i) {
        int current = i;
        bool valid = true;
        for (int j = 0; j < d; ++j) {
            current = parent[current];
            if (current == 0) {
                valid = false;
                break;
            }
        }
        cout << (valid ? to_string(current) : "-1") << endl;
    }    
    return 0;
}

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