이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#define int long long
#ifdef LOCAL
void debug_out() {cerr<<endl;}
template <typename Head, typename... Tail>
void debug_out(Head _H, Tail... _T) {cerr<<" "<<to_string(_H);debug_out(_T...);}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:",debug_out(__VA_ARGS__)
#else
#define debug(...)
#endif
const int MAXN = 300005;
const int inf=1000000500ll;
const long long oo =1000000000000000500ll;
const int MOD = (int)1e9+7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef pair<int,int> pi;
int n,s;
int dp[MAXN];
int A[MAXN], P[MAXN];
vector<int>child[MAXN];
int st[MAXN];
int rev[MAXN];
int TIME;
void dfs(int x, int p){
st[x]=TIME;
rev[TIME]=x;
++TIME;
for(auto v:child[x])if(v!=p){
dfs(v,x);
}
}
int32_t main()
{
ios_base::sync_with_stdio(0); cin.tie(0);
cin >> n >> dp[0];
int ans=0;
for(int i=1;i<=n;i++){
cin>>A[i]>>P[i];
child[P[i]].push_back(i);
}
dfs(0,-1);
for(int i=1;i<=n;i++){
int node=rev[i];
for(int j=st[P[node]];j<i;j++){
dp[i]=max(dp[i],dp[j]+A[node]);
}
ans=max(ans,dp[i]-dp[0]);
}
cout<<ans;
}
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