結果
| 問題 |
No.3258 Xor Division Game
|
| コンテスト | |
| ユーザー |
hint908
|
| 提出日時 | 2025-09-05 22:32:38 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 158 ms / 2,000 ms |
| コード長 | 3,548 bytes |
| コンパイル時間 | 4,154 ms |
| コンパイル使用メモリ | 297,164 KB |
| 実行使用メモリ | 16,000 KB |
| 最終ジャッジ日時 | 2025-09-05 22:33:30 |
| 合計ジャッジ時間 | 14,227 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 67 |
ソースコード
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
using namespace std;
using uint = unsigned int;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
template<class T> using V = vector<T>;
template<class T> using VV = V<V<T>>;
template<class T> using VVV = V<VV<T>>;
template<class T> using VVVV = VV<VV<T>>;
#define rep(i,n) for(ll i=0ll;(i)<(n);(i)++)
#define REP(i,a,n) for(ll i=(a);(i)<(n);(i)++)
#define rrep(i,n) for(ll i=(n)-1;(i)>=(0ll);(i)--)
#define RREP(i,a,n) for(ll i=(n)-1;(i)>=(a);(i)--)
const long long INF = (1LL << 60);
const long long mod99 = 998244353;
const long long mod107 = 1000000007;
const long long mod = mod99;
#define eb emplace_back
#define be(v) (v).begin(),(v).end()
#define all(v) (v).begin(),(v).end()
#define foa(i,v) for(auto& (i) : (v))
#define UQ(v) sort(be(v)), (v).erase(unique(be(v)), (v).end())
#define UQ2(v,cmp) sort(be(v)), (v).erase(unique(be(v),cmp), (v).end())
#define UQ3(v,cmp) sort(be(v),cmp), (v).erase(unique(be(v)), (v).end())
#define UQ4(v,cmp,cmp2) sort(be(v), cmp), (v).erase(unique(be(v),cmp2), (v).end())
#define LB(x,v) (lower_bound(be(v),(x))-(v).begin())
#define LB2(x,v,cmp) (lower_bound(be(v),(x),(cmp))-(v).begin())
#define UB(x,v) (upper_bound(be(v),(x))-(v).begin())
#define UB2(x,v,cmp) (upper_bound(be(v),(x),(cmp))-(v).begin())
#define dout() cout << fixed << setprecision(20)
#define randinit() srand((unsigned)time(NULL))
template<class T, class U> bool chmin(T& t, const U& u) { if (t > u){ t = u; return 1;} return 0; }
template<class T, class U> bool chmax(T& t, const U& u) { if (t < u){ t = u; return 1;} return 0; }
ll Rnd(ll L=0, ll R=mod99){return rand()%(R-L)+L;}
void solve(){
ll n;
cin >> n;
V<ll> v(n);
rep(i,n) cin >> v[i];
{
V<ll> w = v;
UQ(w);
rep(i, n) v[i] = LB(v[i], w);
}
V<ll> prev(n, -1), next(n, -1);
V<ll> last(n, -1);
V<ll> cnt(n, 0);
rep(i, n){
if(last[v[i]] != -1){
prev[i] = last[v[i]];
next[last[v[i]]] = i;
cnt[i] ++;
cnt[last[v[i]]] ++;
}
last[v[i]] = i;
}
set<pair<ll,ll>> st;
st.insert({n-1, 0});
queue<ll> que;
ll ans = 0;
rep(i, n) if(cnt[i] == 0){
que.push(i);
}
while(!que.empty()){
ans++;
ll mid = que.front();
que.pop();
auto[r,l] = *st.lower_bound({mid, -1});
st.erase({r, l});
if(l == r) continue;
if(l != mid) st.insert({mid-1, l});
if(r != mid) st.insert({r, mid+1});
if(r-mid < mid-l){
REP(i,mid+1, r+1) if(prev[i] != -1 and prev[i] < mid){
cnt[i]--;
if(cnt[i] == 0) que.push(i);
cnt[prev[i]] --;
if(cnt[prev[i]] == 0) que.push(prev[i]);
next[prev[i]] = -1;
prev[i] = -1;
}
}else{
REP(i,l,mid) if(next[i] != -1 and next[i] > mid){
cnt[i]--;
if(cnt[i] == 0) que.push(i);
cnt[next[i]] --;
if(cnt[next[i]] == 0) que.push(next[i]);
prev[next[i]] = -1;
next[i] = -1;
}
}
}
if(ans%2) cout << "Alice\n";
else cout << "Bob\n";
}
int main(){
cin.tie(nullptr);
ios::sync_with_stdio(false);
int t=1;
// cin >> t;
rep(i,t) solve();
}
hint908