結果

問題 No.2674 k-Walk on Bipartite
ユーザー siganaisiganai
提出日時 2024-03-15 22:09:56
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 77 ms / 2,000 ms
コード長 7,673 bytes
コンパイル時間 2,085 ms
コンパイル使用メモリ 216,400 KB
実行使用メモリ 14,304 KB
最終ジャッジ日時 2024-09-30 01:26:11
合計ジャッジ時間 4,139 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge2
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
6,820 KB
testcase_01 AC 2 ms
6,816 KB
testcase_02 AC 2 ms
6,820 KB
testcase_03 AC 1 ms
6,820 KB
testcase_04 AC 2 ms
6,816 KB
testcase_05 AC 2 ms
6,816 KB
testcase_06 AC 1 ms
6,816 KB
testcase_07 AC 50 ms
12,568 KB
testcase_08 AC 59 ms
11,008 KB
testcase_09 AC 39 ms
12,588 KB
testcase_10 AC 70 ms
12,544 KB
testcase_11 AC 41 ms
10,368 KB
testcase_12 AC 66 ms
11,036 KB
testcase_13 AC 33 ms
11,356 KB
testcase_14 AC 11 ms
9,200 KB
testcase_15 AC 68 ms
12,836 KB
testcase_16 AC 53 ms
13,876 KB
testcase_17 AC 50 ms
10,184 KB
testcase_18 AC 21 ms
8,992 KB
testcase_19 AC 42 ms
11,936 KB
testcase_20 AC 39 ms
13,004 KB
testcase_21 AC 54 ms
11,008 KB
testcase_22 AC 77 ms
14,304 KB
testcase_23 AC 2 ms
6,816 KB
testcase_24 AC 2 ms
6,820 KB
testcase_25 AC 1 ms
6,816 KB
testcase_26 AC 2 ms
6,820 KB
testcase_27 AC 1 ms
6,816 KB
testcase_28 AC 1 ms
6,816 KB
testcase_29 AC 2 ms
6,816 KB
testcase_30 AC 1 ms
6,820 KB
testcase_31 AC 2 ms
6,816 KB
testcase_32 AC 2 ms
6,820 KB
testcase_33 AC 2 ms
6,820 KB
testcase_34 AC 1 ms
6,820 KB
testcase_35 AC 2 ms
6,816 KB
testcase_36 AC 1 ms
6,816 KB
testcase_37 AC 2 ms
6,820 KB
testcase_38 AC 2 ms
6,824 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 # 

#line 1 "test.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 ull = unsigned 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 vul = vector<ull>;
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; }
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 = 998244353;
//constexpr int mod = 1000000007;
#line 1 "library/data-structure/unionfind.hpp"
struct unionfind {
  public:
    unionfind() : _n(0) {}
    explicit unionfind(int n) : _n(n), parent_or_size(n, -1) {}
    int merge(int a, int b) {
        assert(0 <= a && a < _n);
        assert(0 <= b && b < _n);
        int x = find(a), y = find(b);
        if (x == y) return x;
        if (-parent_or_size[x] < -parent_or_size[y]) swap(x, y);
        parent_or_size[x] += parent_or_size[y];
        parent_or_size[y] = x;
        return x;
    }
    bool same(int a, int b) {
        assert(0 <= a && a < _n);
        assert(0 <= b && b < _n);
        return find(a) == find(b);
    }
    int find(int a) {
        assert(0 <= a && a < _n);
        if (parent_or_size[a] < 0) return a;
        return parent_or_size[a] = find(parent_or_size[a]);
    }
    int size(int a) {
        assert(0 <= a && a < _n);
        return -parent_or_size[find(a)];
    }
    vector<vector<int>> groups() {
        vector<int> leader_buf(_n), group_size(_n);
        for (int i = 0; i < _n; i++) {
            leader_buf[i] = find(i);
            group_size[leader_buf[i]]++;
        }
        vector<vector<int>> result(_n);
        for (int i = 0; i < _n; i++) {
            result[i].reserve(group_size[i]);
        }
        for (int i = 0; i < _n; i++) {
            result[leader_buf[i]].push_back(i);
        }
        result.erase(
            remove_if(result.begin(), result.end(),
                           [&](const vector<int>& v) { return v.empty(); }),
            result.end());
        return result;
    }
  private:
    int _n;
    // root node: -1 * component size
    // otherwise: parent
    vector<int> parent_or_size;
};
#line 90 "test.cpp"
int main() {
    INT(n,m);
    INT(s,t,k);
    s--;
    t--;
    vvi g(n);
    unionfind uf(2*n);
    if(n == 1) {
        No();
        return 0;
    }
    rep(i,m) {
        INT(u,v);
        u--,v--;
        g[u].emplace_back(v);
        g[v].emplace_back(u);
        uf.merge(u,v+n);
        uf.merge(v,u+n);
    }
    if(n == 2) {
        if(m == 1) {
            if(s == t && k % 2 == 0) Yes();
            else if(s != t && k % 2) Yes(); 
            else No();
        }
        else {
            if(s == t && k % 2 == 0) cout << "Unknown\n";
            else if(s != t && k % 2) cout << "Unknown\n";
            else No();
        }
        return 0;
    }
    debug(uf.groups());
    if((!uf.same(s,t+n)) && (!uf.same(s,t))) {
        cout << "Unknown\n";
    }
    else if(uf.same(s,t+n)) {
        if(k % 2 == 0) No();
        else {
            vi dist(n,1e9);
            queue<int> q;
            q.emplace(s);
            dist[s] = 0;
            while(!q.empty()) {
                auto now = q.front();
                q.pop();
                for(auto &nex:g[now]) {
                    if(chmin(dist[nex],dist[now] + 1)) {
                        q.emplace(nex);
                    }
                }
            }
            if(dist[t] <= k) Yes();
            else cout << "Unknown\n";
        }
    }
    else {
        if(k % 2) No();
        else {
            vi dist(n,1e9);
            queue<int> q;
            q.emplace(s);
            dist[s] = 0;
            while(!q.empty()) {
                auto now = q.front();
                q.pop();
                for(auto &nex:g[now]) {
                    if(chmin(dist[nex],dist[now] + 1)) {
                        q.emplace(nex);
                    }
                }
            }
            if(dist[t] <= k) Yes();
            else cout << "Unknown\n";
        }
    }
}
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