結果

問題 No.2476 Knight Game
ユーザー ecottea
提出日時 2023-09-20 14:54:29
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 355 ms / 2,000 ms
コード長 8,304 bytes
コンパイル時間 4,703 ms
コンパイル使用メモリ 272,284 KB
最終ジャッジ日時 2025-02-16 23:39:58
ジャッジサーバーID
(参考情報)
judge3 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 1
other AC * 5
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 #
プレゼンテーションモードにする

#ifndef HIDDEN_IN_VS //
//
#define _CRT_SECURE_NO_WARNINGS
//
#include <bits/stdc++.h>
using namespace std;
//
using ll = long long; // -2^63 2^63 = 9 * 10^18int -2^31 2^31 = 2 * 10^9
using pii = pair<int, int>; using pll = pair<ll, ll>; using pil = pair<int, ll>; using pli = pair<ll, int>;
using vi = vector<int>; using vvi = vector<vi>; using vvvi = vector<vvi>; using vvvvi = vector<vvvi>;
using vl = vector<ll>; using vvl = vector<vl>; using vvvl = vector<vvl>; using vvvvl = vector<vvvl>;
using vb = vector<bool>; using vvb = vector<vb>; using vvvb = vector<vvb>;
using vc = vector<char>; using vvc = vector<vc>; using vvvc = vector<vvc>;
using vd = vector<double>; using vvd = vector<vd>; using vvvd = vector<vvd>;
template <class T> using priority_queue_rev = priority_queue<T, vector<T>, greater<T>>;
using Graph = vvi; using ull = unsigned long long;
//
const double PI = acos(-1);
const vi DX = { 1, 0, -1, 0 }; // 4
const vi DY = { 0, 1, 0, -1 };
int INF = 1001001001; ll INFL = 4004004003104004004LL; // (int)INFL = 1010931620;
double EPS = 1e-15;
//
struct fast_io { fast_io() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(18); } } fastIOtmp;
//
#define all(a) (a).begin(), (a).end()
#define sz(x) ((int)(x).size())
#define lbpos(a, x) (int)distance((a).begin(), std::lower_bound(all(a), x))
#define ubpos(a, x) (int)distance((a).begin(), std::upper_bound(all(a), x))
#define Yes(b) {cout << ((b) ? "Yes\n" : "No\n");}
#define rep(i, n) for(int i = 0, i##_len = int(n); i < i##_len; ++i) // 0 n-1
#define repi(i, s, t) for(int i = int(s), i##_end = int(t); i <= i##_end; ++i) // s t
#define repir(i, s, t) for(int i = int(s), i##_end = int(t); i >= i##_end; --i) // s t
#define repe(v, a) for(const auto& v : (a)) // a
#define repea(v, a) for(auto& v : (a)) // a
#define repb(set, d) for(int set = 0; set < (1 << int(d)); ++set) // d
#define repp(a) sort(all(a)); for(bool a##_perm = true; a##_perm; a##_perm = next_permutation(all(a))) // a
#define smod(n, m) ((((n) % (m)) + (m)) % (m)) // mod
#define uniq(a) {sort(all(a)); (a).erase(unique(all(a)), (a).end());} //
#define EXIT(a) {cout << (a) << endl; exit(0);} //
#define inQ(x, y, u, l, d, r) ((u) <= (x) && (l) <= (y) && (x) < (d) && (y) < (r)) //
//
template <class T> inline ll pow(T n, int k) { ll v = 1; rep(i, k) v *= n; return v; }
template <class T> inline bool chmax(T& M, const T& x) { if (M < x) { M = x; return true; } return false; } // true
    
template <class T> inline bool chmin(T& m, const T& x) { if (m > x) { m = x; return true; } return false; } // true
    
template <class T> inline T get(T set, int i) { return (set >> i) & T(1); }
//
template <class T, class U> inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; }
template <class T> inline istream& operator>>(istream& is, vector<T>& v) { repea(x, v) is >> x; return is; }
template <class T> inline vector<T>& operator--(vector<T>& v) { repea(x, v) --x; return v; }
template <class T> inline vector<T>& operator++(vector<T>& v) { repea(x, v) ++x; return v; }
#endif //
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#ifdef _MSC_VER
#include "localACL.hpp"
#endif
//using mint = modint1000000007;
using mint = modint998244353;
//using mint = modint; // mint::set_mod(m);
namespace atcoder {
inline istream& operator>>(istream& is, mint& x) { ll x_; is >> x_; x = x_; return is; }
inline ostream& operator<<(ostream& os, const mint& x) { os << x.val(); return os; }
}
using vm = vector<mint>; using vvm = vector<vm>; using vvvm = vector<vvm>; using vvvvm = vector<vvvm>;
#endif
#ifdef _MSC_VER // Visual Studio
#include "local.hpp"
#else // gcc
inline int popcount(int n) { return __builtin_popcount(n); }
inline int popcount(ll n) { return __builtin_popcountll(n); }
inline int lsb(int n) { return n != 0 ? __builtin_ctz(n) : -1; }
inline int lsb(ll n) { return n != 0 ? __builtin_ctzll(n) : -1; }
inline int msb(int n) { return n != 0 ? (31 - __builtin_clz(n)) : -1; }
inline int msb(ll n) { return n != 0 ? (63 - __builtin_clzll(n)) : -1; }
inline int msb(__int128 n) { return (n >> 64) != 0 ? (127 - __builtin_clzll((ll)(n >> 64))) : n != 0 ? (63 - __builtin_clzll((ll)(n))) : -1; }
#define gcd __gcd
#define dump(...)
#define dumpel(v)
#define dump_list(v)
#define dump_mat(v)
#define input_from_file(f)
#define output_to_file(f)
#define Assert(b) { if (!(b)) while (1) cout << "OLE"; }
#endif
//O(?)
/*
* p
* nxt(p, nps) p nps
*/
template <class T>
map<T, int> calc_nimber(const T& p, function<void(const T&, vector<T>&)>& nxt) {
map<T, int> nim; //
function<int(const T&)> calc_nimber = [&](const T& p) {
if (nim.count(p)) return nim[p];
vector<T> nps;
nxt(p, nps);
vi next_nimbers;
repe(np, nps) {
next_nimbers.push_back(calc_nimber(np));
}
uniq(next_nimbers);
int i = 0;
while (i < sz(next_nimbers) && next_nimbers[i] == i) i++;
nim[p] = i;
return nim[p];
};
calc_nimber(p);
return nim;
/* nxt
using T = vi;
function<void(const T&, vector<T>&)> nxt = [&](const T& p, vector<T>& nps) {
};
*/
}
vi dxK = { -1, -2, -2, -1, 1, 2, 2, 1 };
vi dyK = { -2, -1, 1, 2, 2, 1, -1, -2 };
bool naive(int h, int w, int x, int y) {
using T = tuple<vvi, int, int>;
function<void(const T&, vector<T>&)> nxt = [&](const T& p, vector<T>& nps) {
auto [a, x, y] = p;
rep(k, 8) {
int nx = x + dxK[k];
int ny = y + dyK[k];
if (!inQ(nx, ny, 0, 0, h, w) || a[nx][ny] == 1) continue;
auto na(a);
na[nx][ny] = 1;
nps.push_back({ na, nx, ny });
}
};
vvi a(h, vi(w));
a[x][y] = 1;
T ini = { a, x, y };
auto g = calc_nimber(ini, nxt);
dumpel(g);
return g[ini] != 0;
}
bool solve(int h, int w, int x, int y) {
if (h > w) {
swap(h, w);
swap(x, y);
}
if (h == 1) return 0;
if (h == 2) {
if ((y + 1 - 1) % 4 >= 2) return 1;
if ((w - y - 1) % 4 >= 2) return 1;
return 0;
}
if (h == 3 && w == 3) {
if (x == 1 && y == 1) return 0;
return 1;
}
if (h == 3 && w == 5) {
if (x != 1 && y == 2) return 1;
}
if (h % 2 == 0 || w % 2 == 0) return 1;
if ((x + y) % 2 == 0) return 0;
return 1;
}
void bug_find() {
#ifdef _MSC_VER
//
mt19937_64 mt;
mt.seed((int)time(NULL));
uniform_int_distribution<ll> rnd(0LL, 1LL << 60);
mute_dump = true;
rep(hoge, 100) {
int h = rnd(mt) % 3 + 1;
int w = rnd(mt) % 9 + 1;
int x = rnd(mt) % h;
int y = rnd(mt) % w;
auto res_naive = naive(h, w, x, y);
auto res_solve = solve(h, w, x, y);
if (res_naive != res_solve) {
cout << "----------error!----------" << endl;
cout << "input:" << endl;
cout << h << " " << w << " " << x << " " << y << endl;
cout << "results:" << endl;
cout << res_naive << endl;
cout << res_solve << endl;
cout << "--------------------------" << endl;
}
}
mute_dump = false;
exit(0);
#endif
}
void Main() {
int h, w, x, y;
cin >> h >> w >> x >> y;
x--; y--;
dump(naive(h, w, x, y)); dump("- - - - -");
cout << (solve(h, w, x, y) ? "Alice" : "Bob") << endl;
}
int main() {
input_from_file("input.txt");
// output_to_file("output.txt");
bug_find();
int t;
cin >> t; //
// t = 1; //
while (t--) {
dump("------------------------------");
Main();
}
}
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