結果
問題 | No.2565 はじめてのおつかい |
ユーザー |
![]() |
提出日時 | 2023-12-02 16:15:40 |
言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 37 ms / 2,000 ms |
コード長 | 3,185 bytes |
コンパイル時間 | 5,333 ms |
コンパイル使用メモリ | 314,004 KB |
実行使用メモリ | 11,008 KB |
最終ジャッジ日時 | 2024-09-26 20:03:25 |
合計ジャッジ時間 | 7,566 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 50 |
ソースコード
#pragma region header #include <bits/stdc++.h> #include <atcoder/all> using namespace std; using namespace atcoder; // clang-format off struct Fast {Fast() {std::cin.tie(0); ios::sync_with_stdio(false);}} fast; inline void IN(void) { return; } template <typename First, typename... Rest> void IN(First &first, Rest &...rest) { cin >> first; IN(rest...); return; } template <typename T> istream &operator>>(istream &is, pair<T, T> &p) { is >> p.first >> p.second; return is; } template <typename T> istream &operator>>(istream &is, vector<T> &v) { for (auto &x : v) is >> x; return is; } template <typename T> ostream &operator<<(ostream &os, vector<T> &v) { for (auto &x : v) os << x << " "; os << endl; return os; } // templetes //alias using ull = unsigned long long; using ll = long long; using vi = vector<int>; using vvi = vector<vi>; using vll = vector<ll>; using vvll = vector<vll>; using vb = vector<bool>; using vvb = vector<vb>; using vs = vector<string>; using pll = pair<ll, ll>; //define short #define vec vector #define all(obs) (obs).begin(), (obs).end() #define YESNO(cond) (cond) ? cout << "YES" << endl : cout << "NO" << endl; #define YesNo(cond) (cond) ? cout << "Yes" << endl : cout << "No" << endl; #define yesno(cond) (cond) ? cout << "yes" << endl : cout << "no" << endl; #define sortv(obs) sort(all(obs)) #define rsortv(obs) reverse(sort(all(obs))) #define bitu(n,i) (((n)>>(i))&1) #define dig10(n) to_string(n).size() #define bcnt(n) __builtin_popcount(n) #define bcntll(n) __builtin_popcountll(n) #define F first #define S second #define pb push_back #define pq priority_queue //define loop #define rep(i, a,b) for(ll i = a; i < (b); i++) #define rrep(i, a,b) for(ll i = a; i >= (b); i--) //define INF const ll INF = 1e18; template <typename T1,typename T2> inline void chmin(T1 &a,T2 b){ if(a>b) a = b; } template <typename T1,typename T2> inline void chmax(T1 &a,T2 b){ if(a<b) a = b; } #pragma endregion header // clang-format on int main(){ ll n,m; cin>>n>>m; vvll g(n); rep(i,0,m){ ll a,b; cin>>a>>b; a--;b--; g[a].pb(b); } vll dist0(n,INF),distn(n,INF),distnmi(n,INF); dist0[0]=0; distn[n-1]=0; distnmi[n-2]=0; queue<ll> q; q.push(0); while(!q.empty()){ ll v=q.front(); q.pop(); for(auto nv:g[v]){ if(dist0[nv]==INF){ dist0[nv]=dist0[v]+1; q.push(nv); } } } q.push(n-1); while(!q.empty()){ ll v=q.front(); q.pop(); for(auto nv:g[v]){ if(distn[nv]==INF){ distn[nv]=distn[v]+1; q.push(nv); } } } q.push(n-2); while(!q.empty()){ ll v=q.front(); q.pop(); for(auto nv:g[v]){ if(distnmi[nv]==INF){ distnmi[nv]=distnmi[v]+1; q.push(nv); } } } ll ans=INF; chmin(ans,dist0[n-1]+distn[n-2]+distnmi[0]); chmin(ans,dist0[n-2]+distnmi[n-1]+distn[0]); if(ans==INF) ans=-1; cout<<ans<<endl; }