Submission #568924

#	Time	Username	Problem	Language	Result	Execution time	Memory
568924		HappyPacMan	Bridges (APIO19_bridges)	C++14	0 / 100	3097 ms	7240 KiB

bridges

#include <bits/stdc++.h>
using namespace std;
const int maxn = 5e4 + 2;
vector<pair<int,int> > adj[maxn];
vector<tuple<int,int,int> > edge;
bool vis[maxn];

void dfs(int u,int &c){
	if(!vis[u]){
		vis[u] = true;
		for(auto [v,w] : adj[u]){
			if(w >= c){
				dfs(v,c);
			}
		}
	}
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int n,m;
	cin >> n >> m;
	for(int i=1;i<=m;i++){
		int u,v,w;
		cin >> u >> v >> w;
		adj[u].emplace_back(v,w);
		adj[v].emplace_back(u,w);
		edge.emplace_back(u,v,w);
	}
	int q;
	cin >> q;
	while(q--){
		int t,x,y;
		cin >> t >> x >> y;
		if(t == 1){
			int u = get<0>(edge[x-1]);
			int v = get<1>(edge[x-1]);
			int w = get<2>(edge[x-1]);
			int ux = lower_bound(adj[u].begin(),adj[u].end(),make_pair(v,w))-adj[u].begin();
			int vx = lower_bound(adj[v].begin(),adj[v].end(),make_pair(u,w))-adj[v].begin();
			edge[x-1] = make_tuple(u,v,y);
			adj[u][ux].second = y;
			adj[v][vx].second = y;
		}else{
			memset(vis,false,sizeof(vis));
			dfs(x,y);
			int r = 0;
			for(int i=1;i<=n;i++){
				r += vis[i];
			}
			cout << r << '\n';
		}
	}
}

Compilation message (stderr)

bridges.cpp: In function 'void dfs(int, int&)':
bridges.cpp:11:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   11 |   for(auto [v,w] : adj[u]){
      |            ^

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