UVA - 12186 Another Crisis

#include<cstdio>
#include<iostream>
#include<cstring>
#include<vector>
#include<algorithm>
using namespace std;
const int maxn=1e5 + 5;
vector<int> sons[maxn];
int n, T;
int dp(int u)
{
    if(sons[u].empty()) return 1;
    int k = sons[u].size();
    vector<int> d;
    for(int i=0;i<k;++i)
        d.push_back(dp(sons[u][i]));
    sort(d.begin(),d.end());
    int c=(k*T-1)/100+1;
    int ans=0;
    for(int i=0;i<c;++i) ans+=d[i];
    return ans;
}
int main()
{
    while(scanf("%d%d", &n, &T) == 2)
    {
        if(n==0 && T==0) return 0;
        for(int i=0;i<=n;++i) sons[i].clear();
        for(int i=1;i<=n;++i)
        {
            int u;
            scanf("%d",&u);
            sons[u].push_back(i);
        }
        printf("%d\n",dp(0));
    }
    return 0;
}