Submission #1044129

#	Time	Username	Problem	Language	Result	Execution time	Memory
1044129		guagua0407	Jobs (BOI24_jobs)	C++17	100 / 100	208 ms	71252 KiB

Main

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=3e5+5;
vector<int> adj[mxn];
vector<ll> x(mxn);
vector<int> p(mxn);
priority_queue<pair<ll,ll>> pq[mxn];

void dfs(int v){
    for(auto u:adj[v]){
        dfs(u);
        if(pq[u].size()>pq[v].size()) swap(pq[u],pq[v]);
        while(!pq[u].empty()){
            pq[v].push(pq[u].top());
            pq[u].pop();
        }
    }
    pair<ll,ll> cur={min(0ll,x[v]),x[v]};
    while(!pq[v].empty() and cur.s<=0){
        cur.f=min(cur.f,cur.s+pq[v].top().f);
        cur.s+=pq[v].top().s;
        pq[v].pop();
    }
    while(!pq[v].empty() and cur.f<=cur.s+pq[v].top().f){
        cur.f=min(cur.f,cur.s+pq[v].top().f);
        cur.s+=pq[v].top().s;
        pq[v].pop();
    }
    if(cur.s>0) pq[v].push(cur);
}

int main() {_
    int n;
    cin>>n;
    cin>>x[0];
    for(int i=1;i<=n;i++){
        cin>>x[i];
        int p;
        cin>>p;
        adj[p].push_back(i);
    }
    dfs(0);
    cout<<pq[0].top().s-x[0]<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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