Submission #168927

#	Time	Username	Problem	Language	Result	Execution time	Memory
168927		tourist	Evacuation plan (IZhO18_plan)	C++14	10 / 100	5 ms	760 KiB

plan

#include <iostream>
#include <queue>
#include <vector>

using namespace std;

#define ll long long
#define sz(x) (int)x.size()
#define pii pair < int, int >
#define endl "\n"
#define METH ios::sync_with_stdio(0); cin.tie(0);
#define BEGIN cout << "BEGIN" << endl;
#define END cout << "END" << endl;

const int N = 1e3;
const int mod = 1e9 + 7;										/// ANOTHER HASH MOD: 228228227
const int prime = 29;											/// ANOTHER HASH PRIME: 997
const int INF = ((long long) 0xCAFEBABE - 1e9 - 4e8);

int n, m, k, q;

vector < int > bad, dist(N + 1, INF);
vector < pii > g[N + 1], querry;

inline void purify() {
}

inline void precalc() {
}

inline void read() {
	scanf("%d %d", &n, &m);
	for (int i = 1; i <= m; i++) {
		int a, b, c;
		scanf("%d %d %d", &a, &b, &c);
		g[a].push_back({b, c});
		g[b].push_back({a, c});
	}

	scanf("%d", &k);
	for (int i = 1; i <= k; i++) {
		int a;
		scanf("%d", &a);
		bad.push_back(a);
	}

	scanf("%d", &q);
	querry.push_back({0, 0});
	for (int i = 1; i <= q; i++) {
		int a, b;
		scanf("%d %d", &a, &b);
		querry.push_back({a, b});
	}
}

void dij() {
	priority_queue < pii > pq;
	for (int i : bad) {
		pq.push({0, i});
		dist[i] = 0;
	}

	while (pq.size()) {
		int cur = pq.top().second;
		int d = -pq.top().first;
		pq.pop();

		if (d > dist[cur]) {
			continue;
		}

		for (pii i : g[cur]) {
			int u = i.first;
			int len = i.second;
			if (d + len < dist[u]) {
				dist[u] = d + len;
				pq.push({-dist[u], u});
			}
		}
	}
}

inline void solve() {
	if (n <= N && m <= N && q <= N) {
		dij();

		for (int i = 1; i <= q; i++) {
			pii j = querry[i];
			printf("%d\n", min(dist[j.first], dist[j.second]));
		}
	}
}

int main() {
	int t;
	//scanf("%d", &t);
	t = 1;

	//precalc();
	while (t--) {
		//purify();
		read();
		solve();
	}
}

Compilation message (stderr)

plan.cpp: In function 'void read()':
plan.cpp:32:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
plan.cpp:35:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d", &a, &b, &c);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
plan.cpp:40:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &k);
  ~~~~~^~~~~~~~~~
plan.cpp:43:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a);
   ~~~~~^~~~~~~~~~
plan.cpp:47:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &q);
  ~~~~~^~~~~~~~~~
plan.cpp:51:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &a, &b);
   ~~~~~^~~~~~~~~~~~~~~~~

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