Submission #1026649

#	Time	Username	Problem	Language	Result	Execution time	Memory
1026649		mansur	Jobs (BOI24_jobs)	C++17	0 / 100	42 ms	38604 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 slav(int n, ll s) {
	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;
	exit(0);
}

void solve() {
	int n, ok = 1;
	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;
	}
	slav(n, s);
	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();
}

Compilation message (stderr)

Main.cpp: In function 'void solve()':
Main.cpp:64:9: warning: variable 'ok' set but not used [-Wunused-but-set-variable]
   64 |  int n, ok = 1;
      |         ^~

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