Submission #994803

#	Time	Username	Problem	Language	Result	Execution time	Memory
994803		WeIlIaN	Jobs (BOI24_jobs)	C++14	40 / 100	101 ms	54208 KiB

Main

#include <bits/stdc++.h>
using namespace std;
 
#define MOD 1000000007
#define FOR(i, s, e) for(int i = s; i < e; i++)
#define REP(i, n) for(int i = 0; i < int(n); i++)
#define all(v) v.begin(), v.end()
#define fir first
#define sec second
 
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<bool> vb;
typedef vector<pii> vpii;
typedef vector<vpii> vvpii;
typedef vector<pll> vpll;
typedef vector<vpll> vvpll;
 
vll x;
vvi c;
vpll res;
 
ll dfs(int a) {
	ll sum = x[a];
	REP(i, c[a].size()) {
		sum += dfs(c[a][i]);
	}
	return max(sum, 0ll);
}
 
void dfs2(int a, ll pr,ll mp, ll lo) {
	ll nex = pr + x[a];
	if(nex > mp) {
		res.push_back({lo-mp, nex-mp});
	}
	REP(i, c[a].size()) {
		dfs2(c[a][i], nex, max(mp, nex), min(lo, nex));
	}
}
 
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, a;
	ll s;
	cin>>n>>s;
	x.resize(n+1);
	c.resize(n+1);
	x[0] = 0ll;
	FOR(i, 1, n+1) {
		cin>>x[i]>>a;
		c[a].push_back(i);
	}
	if(s == 1e18) {
		cout<<dfs(0);
	}
	else {
		ll ans = 0;
		REP(i, c[0].size()) {
			dfs2(c[0][i], 0ll, 0ll, 0ll);
		}
		sort(all(res), greater<pll>());
		REP(i, res.size()) {
			if(res[i].fir + s < 0) {
				break;
			}
			s += res[i].sec;
			ans += res[i].sec;
		}
		cout << ans;
	}
}

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