結果

問題 No.2565 はじめてのおつかい
ユーザー dyktr_06dyktr_06
提出日時 2023-12-02 15:46:20
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 178 ms / 2,000 ms
コード長 5,723 bytes
コンパイル時間 2,382 ms
コンパイル使用メモリ 216,516 KB
実行使用メモリ 36,232 KB
最終ジャッジ日時 2023-12-02 15:46:30
合計ジャッジ時間 7,817 ms
ジャッジサーバーID
（参考情報） 		judge11 / judge10
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
6,676 KB
testcase_01 AC 2 ms
6,676 KB
testcase_02 AC 2 ms
6,676 KB
testcase_03 AC 178 ms
36,232 KB
testcase_04 AC 75 ms
36,232 KB
testcase_05 AC 2 ms
6,676 KB
testcase_06 AC 82 ms
17,480 KB
testcase_07 AC 39 ms
11,008 KB
testcase_08 AC 43 ms
11,648 KB
testcase_09 AC 73 ms
16,100 KB
testcase_10 AC 52 ms
12,928 KB
testcase_11 AC 158 ms
26,744 KB
testcase_12 AC 19 ms
8,704 KB
testcase_13 AC 49 ms
12,544 KB
testcase_14 AC 105 ms
19,616 KB
testcase_15 AC 102 ms
19,180 KB
testcase_16 AC 92 ms
29,492 KB
testcase_17 AC 16 ms
8,064 KB
testcase_18 AC 22 ms
12,788 KB
testcase_19 AC 115 ms
24,348 KB
testcase_20 AC 92 ms
22,272 KB
testcase_21 AC 95 ms
22,476 KB
testcase_22 AC 43 ms
15,376 KB
testcase_23 AC 67 ms
15,900 KB
testcase_24 AC 9 ms
6,676 KB
testcase_25 AC 92 ms
22,460 KB
testcase_26 AC 52 ms
15,104 KB
testcase_27 AC 79 ms
23,472 KB
testcase_28 AC 117 ms
23,960 KB
testcase_29 AC 146 ms
28,520 KB
testcase_30 AC 103 ms
25,444 KB
testcase_31 AC 111 ms
23,128 KB
testcase_32 AC 45 ms
14,892 KB
testcase_33 AC 87 ms
24,356 KB
testcase_34 AC 103 ms
21,644 KB
testcase_35 AC 96 ms
27,540 KB
testcase_36 AC 103 ms
24,160 KB
testcase_37 AC 53 ms
15,460 KB
testcase_38 AC 73 ms
21,716 KB
testcase_39 AC 92 ms
18,204 KB
testcase_40 AC 120 ms
28,356 KB
testcase_41 AC 137 ms
29,584 KB
testcase_42 AC 65 ms
14,976 KB
testcase_43 AC 80 ms
20,280 KB
testcase_44 AC 42 ms
11,904 KB
testcase_45 AC 18 ms
8,576 KB
testcase_46 AC 122 ms
20,300 KB
testcase_47 AC 53 ms
14,720 KB
testcase_48 AC 53 ms
12,772 KB
testcase_49 AC 18 ms
8,448 KB
testcase_50 AC 54 ms
16,692 KB
testcase_51 AC 2 ms
6,676 KB
testcase_52 AC 30 ms
17,792 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <bits/stdc++.h>

using namespace std;

#define overload4(_1, _2, _3, _4, name, ...) name
#define rep1(n) for(int i = 0; i < (int)(n); ++i)
#define rep2(i, n) for(int i = 0; i < (int)(n); ++i)
#define rep3(i, a, b) for(int i = (a); i < (int)(b); ++i)
#define rep4(i, a, b, c) for(int i = (a); i < (int)(b); i += (c))
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)

#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; --i)
#define ALL(a) (a).begin(), (a).end()
#define Sort(a) (sort((a).begin(), (a).end()))
#define RSort(a) (sort((a).rbegin(), (a).rend()))
#define UNIQUE(a) (a.erase(unique((a).begin(), (a).end()), (a).end()))

typedef long long int ll;
typedef unsigned long long ul;
typedef long double ld;
typedef vector<int> vi;
typedef vector<long long> vll;
typedef vector<char> vc;
typedef vector<string> vst;
typedef vector<double> vd;
typedef vector<long double> vld;
typedef pair<long long, long long> P;

template<class T> long long sum(const T& a){ return accumulate(a.begin(), a.end(), 0LL); }
template<class T> auto min(const T& a){ return *min_element(a.begin(), a.end()); }
template<class T> auto max(const T& a){ return *max_element(a.begin(), a.end()); }

const long long MINF = 0x7fffffffffff;
const long long INF = 0x1fffffffffffffff;
const long long MOD = 998244353;
const long double EPS = 1e-9;
const long double PI = acos(-1);
 
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

template<typename T1, typename T2> istream &operator>>(istream &is, pair<T1, T2> &p){ is >> p.first >> p.second; return is; }
template<typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &p){ os << "(" << p.first << ", " << p.second << ")"; return os; }
template<typename T> istream &operator>>(istream &is, vector<T> &v){ for(T &in : v) is >> in; return is; }
template<typename T> ostream &operator<<(ostream &os, const vector<T> &v){ for(int i = 0; i < (int) v.size(); ++i){ os << v[i] << (i + 1 != (int) v.size() ? " " : ""); } return os; }
template <typename T, typename S> ostream &operator<<(ostream &os, const map<T, S> &mp){ for(auto &[key, val] : mp){ os << key << ":" << val << " "; } return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &st){ auto itr = st.begin(); for(int i = 0; i < (int)st.size(); ++i){ os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &st){ auto itr = st.begin(); for(int i = 0; i < (int)st.size(); ++i){ os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, queue<T> q){ while(q.size()){ os << q.front() << " "; q.pop(); } return os; }
template <typename T> ostream &operator<<(ostream &os, deque<T> q){ while(q.size()){ os << q.front() << " "; q.pop_front(); } return os; }
template <typename T> ostream &operator<<(ostream &os, stack<T> st){ while(st.size()){ os << st.top() << " "; st.pop(); } return os; }
template <class T, class Container, class Compare> ostream &operator<<(ostream &os, priority_queue<T, Container, Compare> pq){ while(pq.size()){ os << pq.top() << " "; pq.pop(); } return os; }

template<class T, class U> inline T vin(T& vec, U n) { vec.resize(n); for(int i = 0; i < (int) n; ++i) cin >> vec[i]; return vec; }
template<class T> inline void vout(T vec, string s = "\n"){ for(auto x : vec) cout << x << s; }
template<class... T> void in(T&... a){ (cin >> ... >> a); }
void out(){ cout << '\n'; }
template<class T, class... Ts> void out(const T& a, const Ts&... b){ cout << a; (cout << ... << (cout << ' ', b)); cout << '\n'; }
template<class T, class U> void inGraph(vector<vector<T>>& G, U n, U m, bool directed = false){ G.resize(n); for(int i = 0; i < m; ++i){ int a, b; cin >> a >> b; a--, b--; G[a].push_back(b); if(!directed) G[b].push_back(a); } }

template <typename T>
vector<long long> dijkstra(const vector<vector<array<long long, 2>>> &G, T x){
    const long long INF = 0x1fffffffffffffff;
    vector<long long> cost((int) G.size(), INF);
    using P = pair<long long, long long>;
    priority_queue<P, vector<P>, greater<>> q;
    cost[x] = 0;
    q.emplace(0, x);
    
    while(q.size()){
        auto [c, at] = q.top();
        q.pop();
        if(c > cost[at]) continue;
        for(auto& [to, t] : G[at]){
            if(cost[to] > c + t){
                cost[to] = c + t;
                q.emplace(cost[to], to);
            }
        }
    }
    return cost;
}

ll n, m;
vll u, v;

void input(){
    in(n, m);
    u.resize(m);
    v.resize(m);
    rep(i, m) in(u[i], v[i]);
}

void solve(){
    rep(i, m) u[i]--, v[i]--;

    vector<vector<array<ll, 2>>> G(n * 4), G2(n);
    rep(i, m){
        rep(j, 4){
            ll bit = j;
            if(v[i] == n - 2){
                bit |= 1;
                G[j * n + u[i]].push_back({bit * n + v[i], 1});
            }else if(v[i] == n - 1){
                bit |= 2;
                G[j * n + u[i]].push_back({bit * n + v[i], 1});
            }else{
                bit |= 0;
                G[j * n + u[i]].push_back({bit * n + v[i], 1});
            }
        }
    }
    rep(i, m){
        G2[v[i]].push_back({u[i], 1});
    }
    
    vll cost = dijkstra(G, 0), cost2 = dijkstra(G2, 0);
    ll ans = INF;
    rep(i, n){
        chmin(ans, cost[3 * n + i] + cost2[i]);
    }
    if(ans == INF){
        out(-1);
    }else{
        out(ans);
    }
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(20);
    
    input();
    solve();
}
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