Submission #1026612

#	Time	Username	Problem	Language	Result	Execution time	Memory
1026612		mansur	Jobs (BOI24_jobs)	C++17	0 / 100	124 ms	41808 KiB

Main

#include<bits/stdc++.h>

using namespace std;

#define rall(s) s.rbegin(), s.rend()
#define all(s) s.begin(), s.end()
#define sz(s) (int)s.size()
#define s second 
#define f first

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int N = 1e6;
const ll inf = 1e18;

vector<int> g[N];
ll pos[N], val[N], x[N], p[N];

void dfs(int u) {
	if (x[u] < 0) pos[u] = abs(x[u]), val[u] = 0;
	else pos[u] = 0, val[u] = x[u];
	for (int to: g[u]) {
		dfs(to);
		if (pos[to] <= val[u]) {
			val[u] = val[u] - pos[to] + val[to];
		}else {
			pos[u] = pos[to] - val[u] + pos[u];
			val[u] = val[to];
		}
	}
	if (!val[u]) pos[u] = 0;
}

void solve() {
	int n, ok = 0;
	ll s;
	cin >> n >> s;
	for (int i = 1; i <= n; i++) {
		cin >> x[i] >> p[i];
		if (p[i] && p[i] != i - 1) ok = 0;
	}
	if (ok) {
		vector<int> h;
		ll ans = 0, z = s;
		for (int i = 1; i <= n + 1; i++) {
			if (p[i]) h.push_back(i);
			else {
				if (sz(h)) {
					ll pr[sz(h)], mn = 0, mx = 0, val = 0;
					for (int j = 0; j < sz(h); j++) {
						if (j) pr[j] = pr[j - 1];
						else pr[j] = 0;
						pr[j] += x[h[j]];
						mn = min(mn, pr[j]);
						mx = max(mx, pr[j]);

						val = max(pr[j] - mn, val);			
					}
					s += mx;
					ans += val;
				}
				h = {i};
			}
		}
		cout << max(ans, s) - z;
		return;
	}
	for (int i = 1; i <= n; i++) {
		g[p[i]].push_back(i);
	}
	dfs(0);
	if (s <= pos[0]) cout << val[0] - s;
	else cout << val[0] - pos[0];
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	solve();
}

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