結果
| 問題 |
No.848 なかよし旅行
|
| コンテスト | |
| ユーザー |
peroon
|
| 提出日時 | 2019-12-03 09:57:07 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 121 ms / 2,000 ms |
| コード長 | 6,913 bytes |
| コンパイル時間 | 2,216 ms |
| コンパイル使用メモリ | 188,208 KB |
| 実行使用メモリ | 19,996 KB |
| 最終ジャッジ日時 | 2024-11-08 01:10:21 |
| 合計ジャッジ時間 | 4,378 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 26 |
ソースコード
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using VI = vector<ll>;
using VV = vector<VI>;
using VS = vector<string>;
using PII = pair<ll, ll>;
// tourist set
template <typename A, typename B>
string to_string(pair<A, B> p);
template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p);
template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p);
string to_string(const string& s) {
return '"' + s + '"';
}
string to_string(const char* s) {
return to_string((string) s);
}
string to_string(bool b) {
return (b ? "true" : "false");
}
string to_string(vector<bool> v) {
bool first = true;
string res = "{";
for (int i = 0; i < static_cast<int>(v.size()); i++) {
if (!first) {
res += ", ";
}
first = false;
res += to_string(v[i]);
}
res += "}";
return res;
}
template <size_t N>
string to_string(bitset<N> v) {
string res = "";
for (size_t i = 0; i < N; i++) {
res += static_cast<char>('0' + v[i]);
}
return res;
}
template <typename A>
string to_string(A v) {
bool first = true;
string res = "{";
for (const auto &x : v) {
if (!first) {
res += ", ";
}
first = false;
res += to_string(x);
}
res += "}";
return res;
}
template <typename A, typename B>
string to_string(pair<A, B> p) {
return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}
template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p) {
return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ")";
}
template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p) {
return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}
void debug_out() { cerr << '\n'; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
cerr << " " << to_string(H);
debug_out(T...);
}
#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif
// tourist set end
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define rep(i,b) FOR(i, 0, b)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<'\n'
#define p2(s, t) cout << (s) << " " << (t) << '\n'
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << '\n'
#define p_yes() p("YES")
#define p_no() p("NO")
#define SZ(x) ((int)(x).size())
#define SORT(A) sort(ALL(A))
#define RSORT(A) sort(ALL(A), greater<ll>())
#define MP make_pair
void no(){p_no(); exit(0);}
void yes(){p_yes(); exit(0);}
const ll mod = 1e9 + 7;
const ll inf = 1e18;
const double PI = acos(-1);
struct Edge{
ll to;
ll cost;
Edge(ll to, ll cost): to(to), cost(cost) {}
Edge(){
to = 0;
cost = 0;
}
};
struct Node{
ll distance;
ll index;
Node(ll d, ll i){
distance = d;
index = i;
}
Node(){}
bool operator<(const Node &another) const
{
return distance < another.distance;
}
bool operator>(const Node &another) const
{
return distance > another.distance;
}
};
struct Dijkstra{
vector<ll> d;
vector<vector<Edge> > graph;
vector<bool> done;
// ノード数を入れる
void initialize(ll size){
d.resize(size);
done.resize(size);
graph.resize(size);
reset();
}
void reset(){
ll N = (ll)graph.size();
FOR(i, 0, N){
d[i] = inf;
done[i] = false;
}
}
ll distance(int i){
if((ll)d.size()<=i) return -1;
return d[i];
}
void print_graph(){
FOR(i, 0, (ll)graph.size()){
cout << i << " -> ";
for(auto edge : graph[i]){
cout << edge.to << " ";
}
cout << endl;
}
p("distance");
FOR(i, 0, (ll)graph.size()){
ll d = distance(i);
cout << i << " " << d << endl;
}
}
void register_edge(ll a, ll b, ll cost){
auto edge = Edge(b, cost);
graph[a].push_back(edge);
}
// 双方向
void register_edge2(ll a, ll b, ll cost){
register_edge(a, b, cost);
register_edge(b, a, cost);
}
void calc_shortest_path(ll from=0){
ll N = graph.size();
if(from<0 || from>=N){
cout << "index error" << endl;
exit(0);
}
priority_queue<Node, vector<Node>, greater<Node> > que;
auto node = Node();
// 始点
node.index = from;
node.distance = 0;
que.push(node);
while(!que.empty()){
// 1番distanceが小さいノード
Node n = que.top();
que.pop();
if(done[n.index]){
continue;
}
done[n.index] = true;
d[n.index] = n.distance;
auto edge_list = graph[n.index];
for(auto edge : edge_list){
// 短くなるノードがあれば
if(!done[edge.to] && n.distance + edge.cost < d[edge.to]){
ll shorter_distance = n.distance + edge.cost;
que.push(Node(shorter_distance, edge.to));
}
}
}
}
};
int main(){
cin.tie(0);
ios::sync_with_stdio(false);
// input
ll N,M,P,Q,T;cin>>N>>M>>P>>Q>>T;
P--; Q--;
// O, P, Q
Dijkstra dij[3];
rep(i, 3) dij[i].initialize(N);
rep(i, M){
ll a,b,c;
cin>>a>>b>>c;
a--; b--;
rep(j, 3){
dij[j].register_edge2(a,b,c);
}
}
dij[0].calc_shortest_path(0);
dij[1].calc_shortest_path(P);
dij[2].calc_shortest_path(Q);
if(dij[0].distance(P) + dij[1].distance(Q) + dij[2].distance(0) <= T){
p(T);
return 0;
}
ll ma = max(2 * dij[0].distance(P), 2 * dij[0].distance(Q));
if(ma > T){
p(-1);
return 0;
}
debug("別行動が必要");
ll min_t = inf; // 別行動する時間の最小値
// x, y全探索
rep(x, N){
rep(y, N){
// 分岐
ll ma = max(dij[1].distance(x) + dij[1].distance(y), dij[2].distance(x) + dij[2].distance(y));
// 共通
ll d = dij[0].distance(x) + dij[0].distance(y);
if(ma+d <= T){
// 可能
// 別行動する時間
ll t = max(dij[1].distance(x) + dij[1].distance(y), dij[2].distance(x) + dij[2].distance(y));
chmin(min_t, t);
}else{
// 不可能
// skip
}
}
}
ll ans = T - min_t;
p(ans);
return 0;
}
peroon