Submission #1269550

#	Time	Username	Problem	Language	Result	Execution time	Memory
1269550		mingga	Jobs (BOI24_jobs)	C++20	100 / 100	222 ms	60284 KiB

Main

// Author: caption_mingle
#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define ll long long
const int mod = 1e9 + 7;
const int inf = 2e9;
const int N = 3e5 + 7;
int n;
ll s;
int d[N], p[N];

vector<int> g[N];

struct sus {
    ll req, summ;
    bool operator < (const sus& o) const {
        if(req == o.req) {
            return summ > o.summ;
        }
        return req > o.req;
    }
};

priority_queue<sus> pq[N];

void dfs(int u) {
    for(int v : g[u]) {
        dfs(v);
        if(sz(pq[v]) > sz(pq[u])) swap(pq[v], pq[u]);
        while(sz(pq[v])) {
            pq[u].push(pq[v].top());
            pq[v].pop();
        }
    }
    sus neww = {max(0, -d[u]), d[u]};
    while(sz(pq[u])) {
        auto cur = pq[u].top();
        if(neww.summ < 0) {
            neww.req = max(neww.req, cur.req - neww.summ);
            neww.summ += cur.summ;
            pq[u].pop();
        } else {
            if(neww.req >= cur.req) {
                pq[u].pop();
                neww.summ += cur.summ;
            } else {
                pq[u].push(neww);
                break;
            }
        }
    }
    if(sz(pq[u]) == 0) pq[u].push(neww);
    if(sz(pq[u]) == 1 and pq[u].top().summ <= 0) pq[u].pop();
}



signed main() {
    cin.tie(0) -> sync_with_stdio(0);
    #define task ""
    if(fopen(task ".INP", "r")) {
        freopen(task ".INP", "r", stdin);
        freopen(task ".OUT", "w", stdout);
    }
    cin >> n >> s;
    for(int i = 1; i <= n; i++) {
        cin >> d[i] >> p[i];
        g[p[i]].pb(i);
    }
    dfs(0);
    ll ans = 0;
    while(sz(pq[0])) {
        auto cur = pq[0].top();
        pq[0].pop();
        // cerr << cur.req << ' ' << cur.summ << ln;
        if(s + ans >= cur.req) {
            ans += cur.summ;
        } 
    }
    cout << ans << ln;
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen(task ".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen(task ".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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