Submission #1026576

#	Time	Username	Problem	Language	Result	Execution time	Memory
1026576		Issa	Jobs (BOI24_jobs)	C++17	14 / 100	43 ms	31484 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define ent "\n"

const int maxn = 2e5 + 100;
const ll INF = (ll)1e18 + 100;
const int inf = 1e9 + 100;
const int MOD = 1e9 + 7;
const int maxl = 350;
const int P = 31;

ll sum, start;
int n;
vector<int> g[maxn];
int p[maxn];
int a[maxn];
ll mn[maxn];

ll f(int v, ll sum = 0, ll mn = 0){
	sum += a[v];
	mn = min(mn, sum);
	ll x = INF;
	if(sum > 0) x = -mn;
	for(int to: g[v]){
		x = min(x, f(to, sum, mn));
	}
	return x;
}

void test(){
	cin >> n >> start; sum = start;
	for(int i = 1; i <= n; i++){
		cin >> a[i] >> p[i];
		g[p[i]].push_back(i);
	}
	for(int i = 1; i <= n; i++){
		mn[i] = f(i);
	}
	set<pll> s;
	for(int to: g[0]){
		s.insert({mn[to], to});
	}
	while(s.size()){
		int v = 0;
		for(auto it = s.begin(); it != s.end() && it->first <= sum; it++){
			int to = it->second;
			if(!v || a[v] < a[to]) v = to;
		}
		if(!v) break;
		s.erase({mn[v], v});
		sum += a[v];
		for(int to: g[v]){
			s.insert({mn[to], to});
		}
	}
	cout << sum - start;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int t; t = 1;
    while(t--) test();
    cout << ent;
}

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