Submission #569119

#	Time	Username	Problem	Language	Result	Execution time	Memory
569119		aryan12	Bridges (APIO19_bridges)	C++17	0 / 100	3043 ms	19408 KiB

bridges

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

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

const int N = 5e4 + 5;
set<array<int, 2> > g[N];
vector<bool> vis(N);

int dfs(int node, int wt, int par)
{
	vis[node] = true;
	int ans = 1;
	for(auto [to, cur_wt]: g[node])
	{
		if(cur_wt >= wt && !vis[to])
		{
			ans += dfs(to, wt, node);
		}
	}
	return ans;
}

void Solve() 
{
	int n, m;
	cin >> n >> m;
	vector<array<int, 3> > edges(m + 1);
	for(int i = 1; i <= m; i++)
	{
		int u, v, w;
		cin >> u >> v >> w;
		g[u].insert({v, w});
		g[v].insert({u, w});
		edges[i] = {u, v, w};
	}
	int q;
	cin >> q;
	for(int i = 1; i <= q; i++)
	{
		int command;
		cin >> command;
		if(command == 1)
		{
			int edge_idx, wt;
			cin >> edge_idx >> wt;
			int prev_wt = edges[edge_idx][2];
			int u = edges[edge_idx][0], v = edges[edge_idx][1];
			g[u].erase({v, prev_wt});
			g[u].insert({v, wt});
			g[v].erase({u, prev_wt});
			g[v].insert({u, wt});
			edges[edge_idx][2] = wt;
		}
		else
		{
			int node, start_wt;
			cin >> node >> start_wt;
			for(int i = 0; i <= n; i++)
			{
				vis[i] = false;
			}
			// cout << "hello\n";
			// cout << "node = " << node << ", start_wt = " << start_wt << "\n";
			cout << dfs(node, start_wt, -1) << "\n";
		}
	}
}

int32_t main() 
{
	auto begin = std::chrono::high_resolution_clock::now();
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int t = 1;
	// cin >> t;
	for(int i = 1; i <= t; i++) 
	{
		//cout << "Case #" << i << ": ";
		Solve();
	}
	auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
	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