Submission #1011706

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011706		ttamx	Jobs (BOI24_jobs)	C++17	0 / 100	299 ms	88656 KiB

Main

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

const int N=3e5+5;

int n;
ll s;
ll a[N];
vector<int> adj[N];

struct DP{
    map<ll,ll> mp;
    void insert(ll x,ll d){
        mp[x]+=d;
        auto it=mp.find(x);
        if(it!=mp.begin()){
            auto x=prev(it),y=it;
            if(x->first+x->second>=y->first){
                it--;
                x->second+=y->second;
                mp.erase(y);
            }
        }
        for(auto x=it,y=next(it);y!=mp.end()&&x->first+x->second>=y->first;y=mp.erase(y)){
            x->second+=y->second;
        }
    }
    int size(){
        return mp.size();
    }
    void pop(ll x){
        ll sum=0;
        for(auto it=mp.begin();it!=mp.end()&&it->first<x;it=mp.erase(it)){
            sum+=it->second;
        }
        insert(0,0);
        insert(x,max(0LL,sum-x));
    }
}dp[N];

void dfs(int u){
    for(auto v:adj[u]){
        dfs(v);
        if(dp[v].size()>dp[u].size())swap(dp[u],dp[v]);
        for(auto [x,y]:dp[v].mp)dp[u].insert(x,y);
    }
    if(a[u]>=0)dp[u].insert(0,a[u]);
    else dp[u].pop(-a[u]);
}

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> s;
    for(int i=1;i<=n;i++){
        int p;
        cin >> a[i] >> p;
        adj[p].emplace_back(i);
    }
    dfs(0);
    cout << prev(dp[0].mp.upper_bound(s))->second;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 29
• Subtask 5: 0 / 31