結果
| 問題 |
No.848 なかよし旅行
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-07-07 20:34:22 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 3,611 bytes |
| コンパイル時間 | 2,451 ms |
| コンパイル使用メモリ | 210,828 KB |
| 最終ジャッジ日時 | 2025-01-07 06:29:13 |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 18 TLE * 8 |
ソースコード
#include <bits/stdc++.h>
#define LLI long long int
#define FOR(v, a, b) for(LLI v = (a); v < (b); ++v)
#define FORE(v, a, b) for(LLI v = (a); v <= (b); ++v)
#define REP(v, n) FOR(v, 0, n)
#define REPE(v, n) FORE(v, 0, n)
#define REV(v, a, b) for(LLI v = (a); v >= (b); --v)
#define ALL(x) (x).begin(), (x).end()
#define RALL(x) (x).rbegin(), (x).rend()
#define ITR(it, c) for(auto it = (c).begin(); it != (c).end(); ++it)
#define RITR(it, c) for(auto it = (c).rbegin(); it != (c).rend(); ++it)
#define EXIST(c,x) ((c).find(x) != (c).end())
#define fst first
#define snd second
#define popcount __builtin_popcount
#define UNIQ(v) (v).erase(unique(ALL(v)), (v).end())
#define bit(i) (1LL<<(i))
#ifdef DEBUG
#include <misc/C++/Debug.cpp>
#else
#define dump(...) ((void)0)
#endif
#define gcd __gcd
using namespace std;
template <class T> constexpr T lcm(T m, T n){return m/gcd(m,n)*n;}
template <typename I> void join(ostream &ost, I s, I t, string d=" "){for(auto i=s; i!=t; ++i){if(i!=s)ost<<d; ost<<*i;}ost<<endl;}
template <typename T> istream& operator>>(istream &is, vector<T> &v){for(auto &a : v) is >> a; return is;}
template <typename T, typename U> istream& operator>>(istream &is, pair<T,U> &p){is >> p.first >> p.second; return is;}
template <typename T, typename U> bool chmin(T &a, const U &b){return (a>b ? a=b, true : false);}
template <typename T, typename U> bool chmax(T &a, const U &b){return (a<b ? a=b, true : false);}
template <typename T, size_t N, typename U> void fill_array(T (&a)[N], const U &v){fill((U*)a, (U*)(a+N), v);}
template <typename Cost = int> class Edge{
public:
int from,to;
Cost cost;
Edge() {}
Edge(int to, Cost cost): to(to), cost(cost){}
Edge(int from, int to, Cost cost): from(from), to(to), cost(cost){}
Edge rev() const {return Edge(to,from,cost);}
friend ostream& operator<<(ostream &os, const Edge &e){
os << "(FROM: " << e.from << "," << "TO: " << e.to << "," << "COST: " << e.cost << ")";
return os;
}
};
template <typename T> using Graph = vector<vector<Edge<T>>>;
template <typename T>
vector<T> dijkstra(Graph<T> &graph, int src){
int n = graph.size();
vector<T> cost(n, -1);
vector<bool> check(n, false);
priority_queue<pair<T,int>, vector<pair<T,int>>, greater<pair<T,int>>> pq;
cost[src] = 0;
pq.push(make_pair(0,src));
while(!pq.empty()){
int i; T d;
tie(d,i) = pq.top(); pq.pop();
if(check[i]) continue;
check[i] = true;
for(auto &e : graph[i]){
if(cost[e.to] < 0){
cost[e.to] = d + e.cost;
pq.push(make_pair(cost[e.to], e.to));
}else{
if(cost[e.to] > d+e.cost){
cost[e.to] = min(cost[e.to], d + e.cost);
if(!check[e.to]) pq.push(make_pair(cost[e.to], e.to));
}
}
}
}
return cost;
}
int main(){
cin.tie(0);
ios::sync_with_stdio(false);
int n,m,p,q,t;
while(cin >> n >> m >> p >> q >> t){
--p, --q;
Graph<LLI> graph(n);
REP(i,m){
int a,b,c; cin >> a >> b >> c;
--a, --b;
graph[a].push_back(Edge<LLI>(a,b,c));
graph[b].push_back(Edge<LLI>(b,a,c));
}
vector<vector<LLI>> dist(n);
REP(i,n){
dist[i] = dijkstra(graph,i);
}
int ans = -1;
// 二人でp,qを巡る
{
if(dist[0][p]+dist[p][q]+dist[q][0] <= t){
chmax(ans, t);
}
}
// iで分岐,jで合流する
REP(i,n){
REP(j,n){
if(dist[0][i] + max(dist[i][p]+dist[p][j], dist[i][q]+dist[q][j]) + dist[j][0] <= t){
chmax(ans, t-max(dist[i][p]+dist[p][j], dist[i][q]+dist[q][j]));
}
}
}
cout << ans << endl;
}
return 0;
}