結果
| 問題 |
No.848 なかよし旅行
|
| コンテスト | |
| ユーザー |
stoq
|
| 提出日時 | 2020-03-26 00:18:55 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 2,842 bytes |
| コンパイル時間 | 1,788 ms |
| コンパイル使用メモリ | 171,508 KB |
| 実行使用メモリ | 40,832 KB |
| 最終ジャッジ日時 | 2025-01-02 00:27:34 |
| 合計ジャッジ時間 | 33,349 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 5 WA * 13 TLE * 8 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
//#include <boost/multiprecision/cpp_int.hpp>
//using multiInt = boost::multiprecision::cpp_int;
using ll = long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template <typename Q_type>
using smaller_queue = priority_queue<Q_type, vector<Q_type>, greater<Q_type>>;
const int MOD_TYPE = 1;
const ll MOD = (MOD_TYPE == 1 ? (ll)(1e9 + 7) : 998244353);
const int INF = (int)1e9;
const ll LINF = (ll)4e18;
const ld DINF = 1e12;
const ld PI = acos(-1.0);
const ld EPS = 1e-11;
#define REP(i, m, n) for (ll i = m; i < (ll)(n); ++i)
#define rep(i, n) REP(i, 0, n)
#define MP make_pair
#define MT make_tuple
#define YES(n) cout << ((n) ? "YES" : "NO") << "\n"
#define Yes(n) cout << ((n) ? "Yes" : "No") << endl
#define Possible(n) cout << ((n) ? "Possible" : "Impossible") << endl
#define possible(n) cout << ((n) ? "possible" : "impossible") << endl
#define Yay(n) cout << ((n) ? "Yay!" : ":(") << endl
#define all(v) v.begin(), v.end()
#define NP(v) next_permutation(all(v))
#define dbg(x) cerr << #x << ":" << x << endl;
vector<int> Dx = {0, 0, -1, 1, -1, 1, -1, 1, 0};
vector<int> Dy = {1, -1, 0, 0, -1, -1, 1, 1, 0};
template <typename T = ll>
struct dijkstra
{
static const int MAX_V = 200010;
const T INF_d;
dijkstra(T INF_d_ = LINF) : INF_d(INF_d_) {}
struct edge
{
int to;
T cost;
};
vector<edge> E[MAX_V];
T d[MAX_V];
using pt = pair<T, int>;
void add_edge(int a, int b, T c, bool undirected = false)
{
E[a].push_back(edge{b, c});
if (undirected)
E[b].push_back(edge{a, c});
}
void calc(int s)
{
priority_queue<pt, vector<pt>, greater<pt>> que;
fill(d, d + MAX_V, INF_d);
que.emplace(0LL, s);
d[s] = 0;
while (!que.empty())
{
pt p = que.top();
que.pop();
int v = p.second;
if (d[v] < p.first)
continue;
for (auto &&e : E[v])
{
if (d[e.to] > d[v] + e.cost)
{
d[e.to] = d[v] + e.cost;
que.emplace(d[e.to], e.to);
}
}
}
}
};
int main()
{
cin.tie(0);
ios::sync_with_stdio(false);
cout << setprecision(30) << setiosflags(ios::fixed);
ll n, m, p, q, t;
cin >> n >> m >> p >> q >> t;
p--, q--;
dijkstra<> ds, ds_i;
rep(i, m)
{
ll a, b, c;
cin >> a >> b >> c;
a--, b--;
ds.add_edge(a, b, c, true);
ds_i.add_edge(a, b, c, true);
}
ds.calc(0);
ll Max = -1;
ll d = ds.d[p] + ds.d[q];
rep(i, n)
{
ll t0 = ds.d[i];
ds_i.calc(i);
if (i == p)
d += ds_i.d[q];
ll t1 = ds_i.d[p], t2 = ds_i.d[q];
ll total = 2 * t0 + 2 * max(t1, t2);
if (total > t)
continue;
ll together = t - 2 * max(t1, t2);
Max = max(Max, together);
}
if (d <= t)
Max = t;
cout << Max << endl;
return 0;
}
stoq