Submission #1262504

#	Time	Username	Problem	Language	Result	Execution time	Memory
1262504		mingga	Two Currencies (JOI23_currencies)	C++20	0 / 100	4 ms	5700 KiB

currencies

// Author: caption_mingle
#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define ll long long
const int mod = 1e9 + 7;
const int inf = 2e9;
const int N = 1e5 + 7;
int n, up[N][20], m, h[N], q, L[N], R[N];
int cnt[N], in[N], out[N], ans[N];
pair<int, int> edge[N], que[N];
int timer;

vector<int> g[N];

struct citizen {
	int u, v, p, gc, sc;
} a[N];

vector<int> ev[N];

void dfs(int u, int p) {
	in[u] = ++timer;
	for(int i = 1; i < 20; i++) up[u][i] = up[up[u][i - 1]][i - 1];
	for(int v : g[u]) {
		if(v == p) continue;
		up[v][0] = u;
		h[v] = h[u] + 1;
		dfs(v, u);
	}
	out[u] = timer;
}

int lca(int u, int v) {
	if(h[u] < h[v]) swap(u, v);
	int k = h[u] - h[v];
	for(int i = 0; (1 << i) <= k; i++) {
		if(k >> i & 1) u = up[u][i];
	}
	if(u == v) return u;
	for(int i = 19; i >= 0; i--) {
		if(up[u][i] != up[v][i]) {
			u = up[u][i];
			v = up[v][i];
		}
	}
	return up[u][0];
}

struct BIT {
	vector<ll> bit;
	int n;
	BIT() {}
	BIT(int n) : n(n) {
		bit.resize(n + 1, 0);
	}
	void update(int u, int x) {
		for(; u <= n; u += (u & -u)) bit[u] += x;
	}
	ll get(int u) {
		ll ans = 0;
		for(; u > 0; u -= (u & -u)) ans += bit[u];
		return ans;
	}
	void update(int l, int r, int x) {
		update(l, x);
		update(r + 1, -x);
	}
};

signed main() {
	cin.tie(0) -> sync_with_stdio(0);
	#define task ""
	if(fopen(task ".INP", "r")) {
		freopen(task ".INP", "r", stdin);
		freopen(task ".OUT", "w", stdout);
	}
	cin >> n >> m >> q;
	for(int i = 1; i < n; i++) {
		int u, v; cin >> u >> v;
		g[u].pb(v);
		g[v].pb(u);
		edge[i] = {u, v};
	}
	for(int i = 1; i <= m; i++) {
		int id, p; cin >> id >> p;
		que[i] = {p, id};
	}
	sort(que + 1, que + m + 1);
	dfs(1, 0);
	for(int i = 1; i <= q; i++) {
		int u, v, gc, sc; cin >> u >> v >> gc >> sc;
		int p = lca(u, v);
		a[i] = {u, v, p, gc, sc};
		L[i] = 1, R[i] = m;
	}	
	for(int i = 1; i <= m; i++) {
		auto& [u, v] = edge[que[i].se];
		if(u == up[v][0]) swap(u, v);
		cnt[u]++;
	}
	for(int i = 1; i <= n; i++) {
		int u = in[i];
		cnt[u] += cnt[up[u][0]]; 
	}
	while(1) {
		bool ok = 0;
		for(int i = 1; i <= q; i++) {
			if(L[i] <= R[i]) {
				int m = (L[i] + R[i]) >> 1;
				ev[m].pb(i);
				ok = 1;
			}
		}
		if(!ok) break;
		BIT bit1(n), bit2(n);
		for(int i = 1; i <= m; i++) {
			auto [p, eid] = que[i];
			auto [u, v] = edge[eid];	
			bit1.update(in[u], out[u], 1);
			bit2.update(in[u], out[u], p);
			for(int id : ev[i]) {
				auto [u, v, p, gc, sc] = a[id];
				ll req = bit2.get(in[u]) + bit2.get(in[v]) - 2 * bit2.get(in[p]);
				if(req <= sc) {
					L[id] = i + 1;
					ans[id] = bit1.get(in[u]) + bit1.get(in[v]) - 2 * bit1.get(in[p]);
				} else R[id] = i - 1;
			}
			ev[i].clear();
		}
	}
	for(int i = 1; i <= q; i++) {
		auto [u, v, p, gc, sc] = a[i];
		int tot = cnt[u] + cnt[v] - 2 * cnt[p];
		// cerr << tot << ' ' << ans[i] << ln;
		if(tot - ans[i] <= gc) {
			cout << gc - tot + ans[i] << ln;
		} else {
			cout << -1 << ln;
		}
	}
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

Compilation message (stderr)

currencies.cpp: In function 'int main()':
currencies.cpp:82:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |                 freopen(task ".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
currencies.cpp:83:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |                 freopen(task ".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 28
• Subtask 3: 0 / 30
• Subtask 4: 0 / 32