Submission #977466

#	Time	Username	Problem	Language	Result	Execution time	Memory
977466		dubabuba	Bridges (APIO19_bridges)	C++14	0 / 100	3095 ms	11988 KiB

bridges

#include <bits/stdc++.h>
using namespace std;

typedef pair<int, int> pii;
#define ff first
#define ss second
#define MP make_pair

const int mxn = 2e5 + 10;
vector<pair<int, pii>> edges;
vector<pii> adj[mxn];
int n, m, q;

int solve(int st, int we) {
	bool vis[n + 1];
	memset(vis, 0, sizeof vis);

	queue<int> q;
	q.push(st);
	// cout << st << ' ' << we << ": ";

	int ret = 0;
	while(q.size()) {
		int u = q.front();
		q.pop();

		if(vis[u]) continue;
		// cout << u << ' ';
		vis[u] = 1;
		ret++;

		for(pii p : adj[u]) {
			int v = p.ff;
			int w = p.ss;
			if(vis[v]) continue;
			if(w < we) continue;
			q.push(v);
		}
	}
	// cout << endl;
	return ret;
}

int main() {
	cin >> n >> m;
	for(int i = 0; i < m; i++) {
		int u, v, w;
		cin >> u >> v >> w;
		adj[u].push_back(MP(v, w));
		adj[v].push_back(MP(u, w));
		edges.push_back(MP(w, MP(u, v)));
	}

	cin >> q;
	for(int i = 0; i < q; i++) {
		int t, s, w;
		cin >> t >> s >> w;

		// for(int i = 1; i <= n; i++)
		// 	for(pii p : adj[i])
		// 		cout << i << " -> " << p.ff << " = " << p.ss << endl;

		if(t == 2) cout << solve(s, w) << endl;
		else {
			int d = edges[s - 1].ff;
			int u = edges[s - 1].ss.ff;
			int v = edges[s - 1].ss.ss;
			for(pii &p : adj[u])
				if(p == MP(v, d))
					p.ss = w;
			for(pii &p : adj[v])
				if(p == MP(u, d))
					p.ss = w;
		}
	}
	return 0;
}

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