Submission #1059027

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059027		Tonyl	Jobs (BOI24_jobs)	C++17	29 / 100	78 ms	49288 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define int ll
using vi = vector<int>;
using pi = pair<ll,ll>;
#define REP(i,n) for (int i = 0; i < n; i++)
#define trav(a,x) for (auto& a : x)
#define D(x) //cerr << #x << ": " << x << endl;
#define all(x) (x).begin(), (x).end()

const int MAX_N = 3*1e5+3;

int n; ll s;
vi children[MAX_N];
int values[MAX_N];
bool done[MAX_N];
priority_queue<pi, vector<pi>, greater<pi>> q;

void dfs(int i, ll curr = 0, ll pref = 0) {
    assert(!done[i]);
    done[i] = 1;

    curr += values[i];

    pref = min(curr, pref);
    if (curr > 0) {
        q.push({-pref, curr});
        curr = 0;
    }


    trav(ch, children[i])
        dfs(ch, curr, pref);
}

signed main() {
    ios_base::sync_with_stdio(false); cin.tie(0);

    cin >> n >> s;
    ll ss = s;

    assert(n < MAX_N);

    REP(i,n) {
        int p; cin >> values[i] >> p;
        if (p == 0) continue;
        p--;

        children[p].push_back(i);
    }

    REP(i,n) {
        if (done[i]) continue;
        dfs(i);
    }

    while (q.size()) {
        auto r = q.top(); q.pop();
        D(r.first);
        D(r.second);
        if (r.first <= s) s += r.second;
        //else break;
    }

    assert(s >= ss);
    cout << s - ss << endl;
    return 0;
}

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