// gs14004's code test
#include <bits/stdc++.h>
using namespace std;
int n,m,inp[200005];
int piv,sz[200005],a[200005];
vector<int> g[200005];
int root;
int dfs(int x){
int num = ++piv;
a[num] = inp[x];
sz[num] = 1;
for(int &i : g[x]){
sz[num] += dfs(i);
}
return sz[num];
}
int dp[2][200005];
void mx(int&a, int b) { a=max(a, b); }
int main() {
ios::sync_with_stdio(0);cin.tie(0);
int N, K, r;
cin>>N>>K;n=N,m=K;
int W[N+1];
for(int i=1; i<=N; i++) {
int p;
cin>>p>>W[i];inp[i]=W[i];
if(p) g[p].push_back(i);
else root=r=i;
}
dfs(root);
for (int i=1; i<=m; i++) {
dp[i%2][n+1] = -1e9;
for (int j=n; j; j--) {
dp[i%2][j] = max(dp[i%2][j+1],dp[(i-1)%2][j+sz[j]] + a[j]);
}
}
cout<<dp[m%2][1]<<'\n';
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
4940 KB |
Output is correct |
| 2 |
Incorrect |
4 ms |
4940 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
