結果

問題 No.2464 To DAG
ユーザー siganaisiganai
提出日時 2023-09-17 13:44:31
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
WA  
実行時間 -
コード長 8,019 bytes
コンパイル時間 2,606 ms
コンパイル使用メモリ 214,548 KB
実行使用メモリ 63,776 KB
最終ジャッジ日時 2024-07-04 09:12:04
合計ジャッジ時間 13,186 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge5
このコードへのチャレンジ
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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
5,248 KB
testcase_01 AC 2 ms
5,376 KB
testcase_02 AC 302 ms
63,776 KB
testcase_03 AC 200 ms
24,296 KB
testcase_04 AC 170 ms
20,196 KB
testcase_05 AC 160 ms
19,488 KB
testcase_06 AC 153 ms
19,000 KB
testcase_07 AC 115 ms
15,060 KB
testcase_08 AC 131 ms
13,172 KB
testcase_09 AC 115 ms
11,464 KB
testcase_10 AC 120 ms
10,448 KB
testcase_11 AC 79 ms
8,508 KB
testcase_12 AC 62 ms
7,656 KB
testcase_13 AC 79 ms
7,760 KB
testcase_14 WA -
testcase_15 AC 169 ms
20,016 KB
testcase_16 AC 73 ms
12,232 KB
testcase_17 AC 12 ms
5,376 KB
testcase_18 AC 42 ms
9,372 KB
testcase_19 WA -
testcase_20 WA -
testcase_21 WA -
testcase_22 AC 63 ms
5,632 KB
testcase_23 AC 63 ms
5,636 KB
testcase_24 AC 62 ms
5,888 KB
testcase_25 AC 61 ms
6,260 KB
testcase_26 WA -
testcase_27 WA -
testcase_28 WA -
testcase_29 WA -
testcase_30 WA -
testcase_31 WA -
testcase_32 WA -
testcase_33 AC 172 ms
21,108 KB
testcase_34 AC 77 ms
12,252 KB
testcase_35 AC 54 ms
6,012 KB
testcase_36 AC 52 ms
5,504 KB
testcase_37 AC 45 ms
5,376 KB
testcase_38 AC 46 ms
5,376 KB
testcase_39 WA -
testcase_40 WA -
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 # 

#line 1 "main.cpp"
//#pragma GCC target("avx,avx2")
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
#ifdef LOCAL
#include <debug.hpp>
#define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (static_cast<void>(0))
#endif
using namespace std;
using ll = long long;
using ld = long double;
using pll = pair<ll, ll>;
using pii = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vpii = vector<pii>;
using vpll = vector<pll>;
using vs = vector<string>;
template<class T> using pq = priority_queue<T, vector<T>, greater<T>>;
#define overload4(_1, _2, _3, _4, name, ...) name
#define overload3(a,b,c,name,...) name
#define rep1(n) for (ll UNUSED_NUMBER = 0; UNUSED_NUMBER < (n); ++UNUSED_NUMBER)
#define rep2(i, n) for (ll i = 0; i < (n); ++i)
#define rep3(i, a, b) for (ll i = (a); i < (b); ++i)
#define rep4(i, a, b, c) for (ll i = (a); i < (b); i += (c))
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define rrep1(n) for(ll i = (n) - 1;i >= 0;i--)
#define rrep2(i,n) for(ll i = (n) - 1;i >= 0;i--)
#define rrep3(i,a,b) for(ll i = (b) - 1;i >= (a);i--)
#define rrep4(i,a,b,c) for(ll i = (a) + ((b)-(a)-1) / (c) * (c);i >= (a);i -= c)
#define rrep(...) overload4(__VA_ARGS__, rrep4, rrep3, rrep2, rrep1)(__VA_ARGS__)
#define all1(i) begin(i) , end(i)
#define all2(i,a) begin(i) , begin(i) + a
#define all3(i,a,b) begin(i) + a , begin(i) + b
#define all(...) overload3(__VA_ARGS__, all3, all2, all1)(__VA_ARGS__)
#define sum(...) accumulate(all(__VA_ARGS__),0LL)
template<class T> bool chmin(T &a, const T &b){ if(a > b){ a = b; return 1; } else return 0; }
template<class T> bool chmax(T &a, const T &b){ if(a < b){ a = b; return 1; } else return 0; }
template<class T> auto min(const T& a){return *min_element(all(a));}
template<class T> auto max(const T& a){return *max_element(all(a));}
template<class... Ts> void in(Ts&... t);
#define INT(...) int __VA_ARGS__; in(__VA_ARGS__)
#define LL(...) ll __VA_ARGS__; in(__VA_ARGS__)
#define STR(...) string __VA_ARGS__; in(__VA_ARGS__)
#define CHR(...) char __VA_ARGS__; in(__VA_ARGS__)
#define DBL(...) double __VA_ARGS__; in(__VA_ARGS__)
#define LD(...) ld __VA_ARGS__; in(__VA_ARGS__)
#define VEC(type, name, size) vector<type> name(size); in(name)
#define VV(type, name, h, w) vector<vector<type>> name(h, vector<type>(w)); in(name)
ll intpow(ll a, ll b){ ll ans = 1; while(b){if(b & 1) ans *= a; a *= a; b /= 2;} return ans;}
ll modpow(ll a, ll b, ll p){ ll ans = 1; a %= p;if(a < 0) a += p;while(b){ if(b & 1) (ans *= a) %= p; (a *= a) %= p; b /= 2; } return ans; }
ll GCD(ll a,ll b) { if(a == 0 || b == 0) return 0; if(a % b == 0) return b; else return GCD(b,a%b);}
ll LCM(ll a,ll b) { if(a == 0) return b; if(b == 0) return a;return a / GCD(a,b) * b;}
void Yes() {cout << "Yes\n";return;}
void No() {cout << "No\n";return;}
void YES() {cout << "YES\n";return;}
void NO() {cout << "NO\n";return;}
namespace IO{
#define VOID(a) decltype(void(a))
struct setting{ setting(){cin.tie(nullptr); ios::sync_with_stdio(false);fixed(cout); cout.precision(12);}} setting;
template<int I> struct P : P<I-1>{};
template<> struct P<0>{};
template<class T> void i(T& t){ i(t, P<3>{}); }
void i(vector<bool>::reference t, P<3>){ int a; i(a); t = a; }
template<class T> auto i(T& t, P<2>) -> VOID(cin >> t){ cin >> t; }
template<class T> auto i(T& t, P<1>) -> VOID(begin(t)){ for(auto&& x : t) i(x); }
template<class T, size_t... idx> void ituple(T& t, index_sequence<idx...>){in(get<idx>(t)...);}
template<class T> auto i(T& t, P<0>) -> VOID(tuple_size<T>{}){ituple(t, make_index_sequence<tuple_size<T>::value>{});} 
#undef VOID
}
#define unpack(a) (void)initializer_list<int>{(a, 0)...}
template<class... Ts> void in(Ts&... t){ unpack(IO :: i(t)); }

#undef unpack
static const double PI = 3.1415926535897932;
template <class F> struct REC {
    F f;
    REC(F &&f_) : f(forward<F>(f_)) {}
    template <class... Args> auto operator()(Args &&...args) const { return f(*this, forward<Args>(args)...); }};
//constexpr int mod = 1000000007;
constexpr int mod = 998244353;
#line 2 "library/graph/graph-template.hpp"
template <typename T> 
struct Edge {
	int from, to;
	T cost;
	Edge() = default;
	Edge(int _to, T _cost) : from(-1), to(_to), cost(_cost) {}
	Edge(int _from, int _to, T _cost) : from(_from), to(_to), cost(_cost) {}
	bool operator < (const Edge &a) const { return cost < a.cost; }
	bool operator > (const Edge &a) const { return cost > a.cost; }
    Edge &operator = (const int &x) {
        to = x;
        return *this;
    }
    operator int() const { return to; }
    friend ostream operator<<(ostream &os, Edge &edge) { return os << edge.to; }
};
 
template <typename T>
using Edges = vector<Edge<T>>;
template <typename T>
using Wgraph = vector<Edges<T>>;
using Ugraph = vector<vector<int>>;
Ugraph uinput(int N, int M = -1, bool is_directed = false, int origin = 1) {
    Ugraph g(N);
    if (M == -1) M = N - 1;
    while(M--) {
        int a,b;
        cin >> a >> b;
        a -= origin, b -= origin;
        g[a].push_back(b);
        if(!is_directed) g[b].push_back(a);
    }
    return g;
}
template <typename T>
Wgraph<T> winput(int N, int M = -1, bool is_directed = false,int origin = 1) {
    Wgraph<T> g(N);
    if (M == -1) M = N - 1;
    while(M--) {
        int a,b;
        T c;
        cin >> a >> b >> c;
        a -= origin, b -= origin;
        g[a].emplace_back(b,c);
        if(!is_directed) g[b].emplace_back(a,c);
    }
    return g;
}
#line 3 "library/graph/cycledetection.hpp"
//自己ループは判定しない
template <typename G>
vector<pair<int,int>> cycleditection(const G &g,bool directed = true) {
    vector<int> pidx(g.size(),-1),vis(g.size());
    vector<pair<int,int>> cycle;
    int fin = 0;
    auto dfs = [&](auto rec,int cur,int pval,int par) -> int {
        pidx[cur] = pval;
        vis[cur] = 1;
        for(auto &dst:g[cur]) {
            if(fin) return -1;
            if(!directed && dst == par) continue;
            if(pidx[dst] == pidx[cur]) {
                cycle.emplace_back(cur,dst);
                return dst;
            }
            if(vis[dst]) continue;
            int nx = rec(rec,dst,pval,cur);
            if(nx != -1) {
                cycle.emplace_back(cur,dst);
                if(cur == nx) {
                    fin = 1;
                    return -1;
                }
                return nx;
            }
        } 
        pidx[cur] = -1;
        return -1;
    };
    for(int i = 0;i < (int)g.size();i++) {
        if(vis[i])continue;
        dfs(dfs,i,i,-1);
    }
    if(fin) {
        reverse(begin(cycle),end(cycle));
        return cycle;
    }
    return vector<pair<int,int>> {};
}
#line 89 "main.cpp"
int main() {
    INT(n,m);
    vvi g(n);
    rep(i,m) {
        INT(u,v);
        u--,v--;
        g[u].emplace_back(v);
    }
    auto ret = cycleditection<vvi>(g);
    if(ret.empty()) {
        cout << -1 << '\n';
        return 0;
    }
    vi used(n),adj(n);
    auto dfs = REC([&](auto &&f,int now) -> int {
        used[now] = 1;
        while(adj[now] < g[now].size()) {
            int nex = g[now][adj[now]];
            if(used[nex] == 1) {
                g[now][adj[now]] = -1;
                adj[now]++;
                used[now] = 0;
                return nex;
            }
            int res = f(nex);
            if(res >= 0) {
                g[now][adj[now]] = -1;
                if(res != now) {
                    used[now] = 0;
                    adj[now]++;
                    return res;
                } 
            }
            adj[now]++;
        }
        used[now] = 0;
        return -1;
    });
    rep(i,n) dfs(i);
    vpii ans;
    rep(i,n) for(auto &&j:g[i]) if(j != -1) ans.emplace_back(i+1,j+1);
    cout << n << " " << ans.size() << '\n';
    for(auto &&[u,v]:ans) cout << u << " " << v << '\n';
}
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