Submission #261973

#	Time	Username	Problem	Language	Result	Execution time	Memory
261973		hanagasumi	Bridges (APIO19_bridges)	C++17	13 / 100	3058 ms	10796 KiB

bridges

#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
#include <deque>
#include <map>
#include <set>
#include <complex>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <random>

#define ft first
#define sc second
#define pb push_back
#define len(v) (int)v.size()
#define int ll

using namespace std;
typedef long long ll;
typedef long double ld;

struct edge {
	int v, u, w;
};

signed main() {
	#ifdef PC
		freopen("in.txt", "r", stdin);
		freopen("out.txt", "w", stdout);
	#endif
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	int n, m, q;
	cin >> n >> m;
	vector<edge> e;
	vector<vector<int>> g(n);
	for (int i = 0; i < m; i++) {
		int a, b, w;
		cin >> a >> b >> w;
		a--, b--;
		g[a].pb(len(e));
		e.pb({a, b, w});
		g[b].pb(len(e));
		e.pb({b, a, w});
	}

	cin >> q;
	while(q--) {
		int type, id, w;
		cin >> type >> id >> w;
		id--;
		if(type == 1) {
			e[2 * id].w = w;
			e[2 * id + 1].w = w;
			continue;
		}
		vector<bool> used(n, 0);
		deque<int> q;
		used[id] = 1;
		q.pb(id);
		while(len(q)) {
			auto now = q.front();
			q.pop_front();
			for (auto i : g[now]) {
				auto x = e[i];
				if(used[x.u] || x.w < w) 
					continue;
				used[x.u] = 1;
				q.pb(x.u);
			}
		}
		int ans = 0;
		for (int i = 0; i < n; i++) {
			if(used[i]) 
				ans++;
		}
		cout << ans << '\n';
	}
	return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27