Submission #488186

#	Time	Username	Problem	Language	Result	Execution time	Memory
488186		mansur	Bridges (APIO19_bridges)	C++17	13 / 100	3075 ms	11584 KiB

bridges

#include<bits/stdc++.h>	
 
/*
#pragma optimize ("g",on)
#pragma GCC optimize("inline")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize ("03")
#pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
*/

//01001101 01100001 01101011 01101000 01100001  01100111 01100001 01111001 

using namespace std;

#define all(a) a.begin(), a.end()                                                   
#define rall(a) a.rbegin(), a.rend()
#define ll long long
#define pb push_back
#define sz(a) a.size()
#define nl '\n'
#define popb pop_back()                                                                   
#define ld double
#define ull unsigned long long
#define ff first                                         
#define ss second  
#define fix fixed << setprecision
#define pii pair<int, int>
#define E exit (0)
#define int long long
 
const int inf = 1e18, N = 2e5 + 1, mod = 1e9 + 7;                    

vector<pii> dd = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};

main() {                                                         
	//freopen(".in", "r", stdin);                                                                                     
	//freopen(".out", "w", stdout);                                                                                     
	ios_base::sync_with_stdio(NULL);                                                                                        
	cin.tie(NULL);
	int n, m;
	cin >> n >> m;
	int u[m + 1], v[m + 1], dd[m + 1];
	for (int i = 1; i <= m; i++) {
		cin >> u[i] >> v[i] >> dd[i];
	}
	int q;
	cin >> q;
	while (q--) {
		int t;
		cin >> t;
		if (t == 1) {
			int i, r;
			cin >> i >> r;
			dd[i] = r;
		}else {
			int p, w;
			cin >> p >> w;
			vector<pii> adj[n + 1];
			for (int i = 1; i <= m; i++) {
				adj[u[i]].pb({v[i], dd[i]});
				adj[v[i]].pb({u[i], dd[i]});
			}
			set<pii> s;
			vector<int> d(n + 1, -inf);
			d[p] = inf;
			s.insert({-inf, p});
			while (!s.empty()) {
				int u = (*s.begin()).ss;
				s.erase(s.begin());
				for (auto e: adj[u]) {
					if (d[e.ff] < min(d[u], e.ss)) {
						d[e.ff] = min(d[u], e.ss);
						s.insert({-d[e.ff], e.ff});						
					}
				}
			}
			int ans = 0;
			for (int i = 1; i <= n; i++) if (d[i] >= w) ans++;
			cout << ans << nl;
		}
	}
}

Compilation message (stderr)

bridges.cpp:36:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   36 | main() {
      | ^~~~

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