結果
問題 | No.845 最長の切符 |
ユーザー |
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提出日時 | 2019-06-28 22:18:58 |
言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 351 ms / 3,000 ms |
コード長 | 3,718 bytes |
コンパイル時間 | 1,218 ms |
コンパイル使用メモリ | 117,276 KB |
実行使用メモリ | 9,984 KB |
最終ジャッジ日時 | 2024-07-02 04:51:33 |
合計ジャッジ時間 | 3,296 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 27 |
ソースコード
// IO#include <cstdio>#include <iomanip>#include <ios>#include <iostream>// algorithm#include <algorithm>#include <cmath>#include <numeric>// container#include <vector>#include <string>#include <tuple>#include <set>#include <map>#include <unordered_map>#include <stack>#include <queue>#include <deque>// others#include <random>#include <limits>#include <functional>#include <ctime>#include <cassert>// type aliasusing lint = long long;using ldouble = long double;template <class T>using greater_priority_queue = std::priority_queue<T, std::vector<T>, std::greater<T>>;/* ----- class ----- */template <class Cost = int>struct Edge {int src, dst;Cost cost;Edge(int src = -1, int dst = -1, Cost cost = 1): src(src), dst(dst), cost(cost){};bool operator<(const Edge<Cost>& e) const { return this->cost < e.cost; }bool operator>(const Edge<Cost>& e) const { return this->cost > e.cost; }};template <class Cost = int>using Edges = std::vector<Edge<Cost>>;template <class Cost = int>using Graph = std::vector<std::vector<Edge<Cost>>>;/* ----- debug ----- */#if __has_include("../setting/source/debug.hpp")#include "../setting/source/debug.hpp"#endif/* ----- short functions ----- */template <class T>inline T sq(T a) { return a * a; }template <class T>inline T iceil(T n, T d) { return (n + d - 1) / d; }template <class T>T gcd(T a, T b) {while (b > 0) {a %= b;std::swap(a, b);}return a;}template <class T, class U>T ipow(T b, U n) {T ret = 1;while (n > 0) {if (n & 1) ret *= b;n >>= 1;b *= b;}return ret;}// 0-indexedtemplate <class T, class U>inline T kthbit(T a, U k) { return (a >> k) & 1; }template <class T, class U>inline T mask(T a, U k) { return a & ((1 << k) - 1); }template <class T>std::map<T, int> compress(std::vector<T>& v) {std::sort(v.begin(), v.end());v.erase(std::unique(v.begin(), v.end()), v.end());std::map<T, int> rev;for (int i = 0; i < v.size(); ++i) rev[v[i]] = i;return rev;}template <class T>T Vec(T v) { return v; }template <class T, class... Ts>auto Vec(size_t l, Ts... ts) {return std::vector<decltype(Vec<T>(ts...))>(l, Vec<T>(ts...));}/* ----- constants ----- */const int INF = std::numeric_limits<int>::max() / 3;// const lint INF = std::numeric_limits<lint>::max() / 3;// const ldouble PI = acos(-1);// const ldouble EPS = 1e-10;// std::mt19937 mt(int(std::time(nullptr)));using namespace std;int main() {int N, M;cin >> N >> M;Graph<int> graph(N);for (int i = 0; i < M; ++i) {int u, v, c;cin >> u >> v >> c;--u, --v;graph[u].emplace_back(u, v, c);graph[v].emplace_back(v, u, c);}auto dp = Vec<int>(1 << N, N, -INF);// dp[b][i] = bを訪れて、今iにいるfor (int v = 0; v < N; ++v) {dp[1 << v][v] = 0;}for (int n = 1; n < N; ++n) { // 訪れた駅の数for (int b = 0; b < (1 << N); ++b) {if (__builtin_popcount(b) != n) continue;for (int v = 0; v < N; ++v) {if (!kthbit(b, v)) continue;for (auto e : graph[v]) {if (kthbit(b, e.dst)) continue;// e.dstに行くauto& to = dp[b | (1 << e.dst)][e.dst];to = max(to, dp[b][v] + e.cost);}}}}int ans = 0;for (int b = 0; b < (1 << N); ++b) {for (int v = 0; v < N; ++v) {ans = max(ans, dp[b][v]);}}cout << ans << endl;return 0;}