結果

問題 No.1065 電柱 / Pole (Easy)
ユーザー hitonanodehitonanode
提出日時 2020-05-29 21:40:00
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 229 ms / 2,000 ms
コード長 6,653 bytes
コンパイル時間 2,442 ms
コンパイル使用メモリ 218,984 KB
実行使用メモリ 23,284 KB
最終ジャッジ日時 2024-11-06 02:57:54
合計ジャッジ時間 7,289 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge5
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
6,820 KB
testcase_01 AC 2 ms
6,816 KB
testcase_02 AC 98 ms
13,612 KB
testcase_03 AC 120 ms
22,000 KB
testcase_04 AC 118 ms
21,728 KB
testcase_05 AC 89 ms
21,624 KB
testcase_06 AC 88 ms
21,460 KB
testcase_07 AC 28 ms
8,576 KB
testcase_08 AC 102 ms
22,700 KB
testcase_09 AC 10 ms
6,820 KB
testcase_10 AC 44 ms
12,032 KB
testcase_11 AC 32 ms
9,216 KB
testcase_12 AC 21 ms
7,168 KB
testcase_13 AC 95 ms
14,480 KB
testcase_14 AC 112 ms
16,976 KB
testcase_15 AC 132 ms
18,772 KB
testcase_16 AC 61 ms
11,464 KB
testcase_17 AC 147 ms
20,104 KB
testcase_18 AC 41 ms
9,088 KB
testcase_19 AC 140 ms
19,392 KB
testcase_20 AC 33 ms
8,000 KB
testcase_21 AC 51 ms
10,496 KB
testcase_22 AC 123 ms
17,972 KB
testcase_23 AC 3 ms
6,816 KB
testcase_24 AC 3 ms
6,816 KB
testcase_25 AC 19 ms
7,040 KB
testcase_26 AC 69 ms
12,480 KB
testcase_27 AC 74 ms
12,276 KB
testcase_28 AC 130 ms
18,208 KB
testcase_29 AC 14 ms
6,816 KB
testcase_30 AC 134 ms
20,028 KB
testcase_31 AC 93 ms
16,180 KB
testcase_32 AC 54 ms
11,092 KB
testcase_33 AC 133 ms
20,776 KB
testcase_34 AC 45 ms
9,344 KB
testcase_35 AC 139 ms
20,220 KB
testcase_36 AC 3 ms
6,816 KB
testcase_37 AC 3 ms
6,820 KB
testcase_38 AC 3 ms
6,820 KB
testcase_39 AC 3 ms
6,820 KB
testcase_40 AC 2 ms
6,816 KB
testcase_41 AC 229 ms
23,284 KB
testcase_42 AC 49 ms
9,728 KB
testcase_43 AC 105 ms
13,952 KB
testcase_44 AC 29 ms
7,424 KB
testcase_45 AC 96 ms
13,696 KB
testcase_46 AC 2 ms
6,816 KB
testcase_47 AC 2 ms
6,816 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <bits/stdc++.h>
using namespace std;
using lint = long long int;
using pint = pair<int, int>;
using plint = pair<lint, lint>;
struct fast_ios { fast_ios(){ cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
#define ALL(x) (x).begin(), (x).end()
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
template<typename T> void ndarray(vector<T> &vec, int len) { vec.resize(len); }
template<typename T, typename... Args> void ndarray(vector<T> &vec, int len, Args... args) { vec.resize(len); for (auto &v : vec) ndarray(v, args...); }
template<typename T> bool chmax(T &m, const T q) { if (m < q) {m = q; return true;} else return false; }
template<typename T> bool chmin(T &m, const T q) { if (m > q) {m = q; return true;} else return false; }
template<typename T1, typename T2> pair<T1, T2> operator+(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); }
template<typename T1, typename T2> pair<T1, T2> operator-(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); }
template<typename T> istream &operator>>(istream &is, vector<T> &vec){ for (auto &v : vec) is >> v; return is; }
template<typename T> ostream &operator<<(ostream &os, const vector<T> &vec){ os << "["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template<typename T> ostream &operator<<(ostream &os, const deque<T> &vec){ os << "deq["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template<typename T> ostream &operator<<(ostream &os, const set<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template<typename T> ostream &operator<<(ostream &os, const unordered_set<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template<typename T> ostream &operator<<(ostream &os, const multiset<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template<typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template<typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa){ os << "(" << pa.first << "," << pa.second << ")"; return os; }
template<typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp){ os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
template<typename TK, typename TV> ostream &operator<<(ostream &os, const unordered_map<TK, TV> &mp){ os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
#define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl;
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/tag_and_trait.hpp>
using namespace __gnu_pbds; // find_by_order(), order_of_key()
template<typename TK> using pbds_set = tree<TK, null_type, less<TK>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename TK, typename TV> using pbds_map = tree<TK, TV, less<TK>, rb_tree_tag, tree_order_statistics_node_update>;
*/

template<typename T>
struct ShortestPath
{
    int V, E;
    int INVALID = -1;
    std::vector<std::vector<std::pair<int, T>>> to;
    ShortestPath() = default;
    ShortestPath(int V) : V(V), E(0), to(V) {}
    void add_edge(int s, int t, T len) {
        assert(0 <= s and s < V);
        assert(0 <= t and t < V);
        to[s].emplace_back(t, len);
        E++;
    }

    std::vector<T> dist;
    std::vector<int> prev;
    // Dijkstra algorithm
    // Complexity: O(E log E)
    void Dijkstra(int s) {
        assert(0 <= s and s < V);
        dist.assign(V, 1e18);
        dist[s] = 0;
        prev.assign(V, INVALID);
        using P = std::pair<T, int>;
        std::priority_queue<P, std::vector<P>, std::greater<P>> pq;
        pq.emplace(0, s);
        while(!pq.empty()) {
            T d;
            int v;
            std::tie(d, v) = pq.top();
            pq.pop();
            if (dist[v] < d) continue;
            for (auto nx : to[v]) {
                T dnx = d + nx.second;
                if (dist[nx.first] > dnx) {
                    dist[nx.first] = dnx, prev[nx.first] = v;
                    pq.emplace(dnx, nx.first);
                }
            }
        }
    }

    // Bellman-Ford algorithm
    // Complexity: O(VE)
    bool BellmanFord(int s, int nb_loop) {
        assert(0 <= s and s < V);
        dist.assign(V, std::numeric_limits<T>::max());
        dist[s] = 0;
        prev.assign(V, INVALID);
        for (int l = 0; l < nb_loop; l++) {
            bool upd = false;
            for (int v = 0; v < V; v++) {
                if (dist[v] == std::numeric_limits<T>::max()) continue;
                for (auto nx : to[v]) {
                    T dnx = dist[v] + nx.second;
                    if (dist[nx.first] > dnx) {
                        dist[nx.first] = dnx, prev[nx.first] = v;
                        upd = true;
                    }
                }
            }
            if (!upd) return true;
        }
        return false;
    }
    // Warshall-Floyd algorithm
    // Complexity: O(E + V^3)
    std::vector<std::vector<T>> dist2d;
    void WarshallFloyd() {
        dist2d.assign(V, std::vector<T>(V, std::numeric_limits<T>::max()));
        for (int i = 0; i < V; i++) {
            dist2d[i][i] = 0;
            for (auto p : to[i]) dist2d[i][p.first] = min(dist2d[i][p.first], p.second);
        }
        for (int k = 0; k < V; k++) {
            for (int i = 0; i < V; i++) {
                if (dist2d[i][k] = std::numeric_limits<T>::max()) continue;
                for (int j = 0; j < V; j++) {
                    if (dist2d[k][j] = std::numeric_limits<T>::max()) continue;
                    dist2d[i][j] = min(dist2d[i][j], dist2d[i][k] + dist2d[k][j]);
                }
            }
        }
    }
};

int main()
{
    int N, M;
    int X, Y;
    cin >> N >> M >> X >> Y;
    vector<lint> P(N), Q(N);
    REP(i, N) cin >> P[i] >> Q[i];
    ShortestPath<double> graph(N);
    while (M--)
    {
        int s, t;
        cin >> s >> t;
        s--, t--;
        double dx = P[s] - P[t];
        double dy = Q[s] - Q[t];
        double dd = sqrt(dx * dx + dy * dy);
        graph.add_edge(s, t, dd);
        graph.add_edge(t, s, dd);
    }

    graph.Dijkstra(X - 1);
    cout << graph.dist[Y - 1] << '\n';
}
0