結果
| 問題 |
No.1065 電柱 / Pole (Easy)
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2020-06-04 17:16:04 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 286 ms / 2,000 ms |
| コード長 | 2,184 bytes |
| コンパイル時間 | 2,356 ms |
| コンパイル使用メモリ | 139,332 KB |
| 最終ジャッジ日時 | 2025-01-10 21:14:44 |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 46 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:61:24: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
61 | int n, m; scanf("%d %d", &n, &m);
| ~~~~~^~~~~~~~~~~~~~~~~
main.cpp:62:24: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
62 | int x, y; scanf("%d %d", &x, &y); x--; y--;
| ~~~~~^~~~~~~~~~~~~~~~~
main.cpp:65:42: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
65 | for (int i = 0; i < n; i++) scanf("%d %d", &vp[i].first, &vp[i].second);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:67:32: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
67 | int u, v; scanf("%d %d", &u, &v);
| ~~~~~^~~~~~~~~~~~~~~~~
ソースコード
#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
#include <stack>
#include <algorithm>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <tuple>
#include <assert.h>
#include <deque>
#include <bitset>
#include <iomanip>
#include <limits>
#include <chrono>
#include <random>
#include <array>
#include <unordered_map>
#include <functional>
#include <complex>
#include <numeric>
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
constexpr long long MAX = 5100000;
constexpr long long INF = 1LL << 60;
constexpr int inf = 1000000007;
//constexpr long long mod = 1000000007LL;
constexpr long long mod = 998244353LL;
const long double PI = acos((long double)(-1));
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
vector<double> dijkstra(int start, vector<vector<pair<int, double>>>& graph) {
vector<double> dist(graph.size(), INF); dist[start] = 0;
priority_queue<pair<double, int>, vector<pair<double, int>>, greater<pair<double, int>>> pq; pq.emplace(0, start);
while (!pq.empty()) {
double cost; int idx; tie(cost, idx) = pq.top(); pq.pop();
if (dist[idx] < cost) continue;
for (auto next : graph[idx]) if (chmin(dist[next.first], cost + next.second)) pq.emplace(dist[next.first], next.first);
}
return dist;
}
using P = pair<int, int>;
double dist(P a, P b) {
double dx = a.first - b.first;
double dy = a.second - b.second;
return sqrt(dx * dx + dy * dy);
}
int main()
{
/*
cin.tie(nullptr);
ios::sync_with_stdio(false);
*/
int n, m; scanf("%d %d", &n, &m);
int x, y; scanf("%d %d", &x, &y); x--; y--;
vector<vector<pair<int, double>>> g(n);
vector<P> vp(n);
for (int i = 0; i < n; i++) scanf("%d %d", &vp[i].first, &vp[i].second);
for (int i = 0; i < m; i++) {
int u, v; scanf("%d %d", &u, &v);
u--; v--;
g[u].emplace_back(v, dist(vp[u], vp[v]));
g[v].emplace_back(u, dist(vp[u], vp[v]));
}
auto dist = dijkstra(x, g);
cout << fixed << setprecision(12) << dist[y] << endl;
return 0;
}