Submission #378590

#	Time	Username	Problem	Language	Result	Execution time	Memory
378590		rk42745417	Evacuation plan (IZhO18_plan)	C++17	23 / 100	415 ms	18412 KiB

plan

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

using ll = int64_t;
using ull = uint64_t;
using uint = uint32_t;
using ld = long double;
const int MOD = 1e9 + 7;
const int INF = 0x3f3f3f3f;
const ll LINF = 2e18;
const double EPS = 1e-9;
#define EMT ios::sync_with_stdio(0); cin.tie(0);

const int N = 1e5 + 25;
int dis[N];
vector<int> npp;
vector<pair<int, int>> edge[N];

void solve() {
	memset(dis, 0x3f, sizeof dis);
	priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;
	for(int a : npp)
		dis[a] = 0, pq.push({dis[a], a});
	while(!pq.empty()) {
		auto [c, u] = pq.top();
		pq.pop();
		if(c > dis[u])
			continue;
		for(const auto &[v, d] : edge[u]) {
			if(dis[v] > c + d) {
				dis[v] = c + d;
				pq.push({dis[v], v});
			}
		}
	}
}
void solve2(int n) { // direct road
	int q;
	cin >> q;
	while(q--) {
		int s, t;
		cin >> s >> t;
		cout << min(dis[s], dis[t]) << '\n';
	}
}
void solve1(int n) { // n <= 15
	solve2(n);
	return;

	int q;
	cin >> q;
	while(q--) {
		int s, t;
		int res = INF;
		for(int i = 0; i < (1 << n); i++) {
			
		}
	}
}

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

	int k;
	cin >> k;
	npp.resize(k);
	for(int &a : npp)
		cin >> a;
	
	solve();
	
	if(n <= 15) {
		solve1(n);
	}
	else
		solve2(n);
}
/*
9 12
1 9 4
1 2 5
2 3 7
2 4 3
4 3 6
3 6 4
8 7 10
6 7 5
5 8 1
9 5 7
5 4 12
6 8 2
2
4 7
5
1 6
5 3
4 8
5 8
1 5

*/

Compilation message (stderr)

plan.cpp: In function 'void solve1(int)':
plan.cpp:53:7: warning: unused variable 's' [-Wunused-variable]
   53 |   int s, t;
      |       ^
plan.cpp:53:10: warning: unused variable 't' [-Wunused-variable]
   53 |   int s, t;
      |          ^
plan.cpp:54:7: warning: unused variable 'res' [-Wunused-variable]
   54 |   int res = INF;
      |       ^~~

• Subtask 1: 10 / 10
• Subtask 2: 13 / 13
• Subtask 3: 0 / 12
• Subtask 4: 0 / 19
• Subtask 5: 0 / 46