結果

問題 No.1665 quotient replace
ユーザー miscalc
提出日時 2021-09-03 21:50:40
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 631 ms / 3,000 ms
コード長 1,445 bytes
コンパイル時間 3,171 ms
コンパイル使用メモリ 195,048 KB
最終ジャッジ日時 2025-01-24 05:29:53
ジャッジサーバーID
(参考情報)
judge4 / judge4
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ファイルパターン 結果
sample AC * 3
other AC * 41
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

#include <bits/stdc++.h>
#include <atcoder/modint>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
//using mint = modint1000000007;
using ll = long long;
using ld = long double;
using pll = pair<ll, ll>;
using tlll = tuple<ll, ll, ll>;
constexpr ll INF = 1LL << 60;
template<class T> bool chmin(T& a, T b) {if (a > b) {a = b; return true;} return false;}
template<class T> bool chmax(T& a, T b) {if (a < b) {a = b; return true;} return false;}
ll safemod(ll A, ll M) {return (A % M + M) % M;}
ll divfloor(ll A, ll B) {if (B < 0) {return divfloor(-A, -B);} return (A - safemod(A, B)) / B;}
ll divceil(ll A, ll B) {if (B < 0) {return divceil(-A, -B);} return divfloor(A + B - 1, B);}
#define FINALANS(A) do {cout << (A) << '\n'; exit(0);} while (false)
int main()
{
ll N;
cin >> N;
vector<ll> A(N);
for (ll i = 0; i < N; i++)
{
cin >> A.at(i);
}
const ll M = 1333333;
vector<ll> primecount(M, 0);
for (ll p = 2; p < M; p++)
{
if (primecount.at(p) == 0)
{
for (ll k = 1; k * p < M; k++)
{
ll tmp = k * p;
while (tmp % p == 0)
{
tmp /= p;
primecount.at(k * p)++;
}
}
}
}
vector<ll> B(N);
for (ll i = 0; i < N; i++)
{
B.at(i) = primecount.at(A.at(i));
//cerr << B.at(i) << endl;
}
ll x = 0;
for (ll i = 0; i < N; i++)
{
x ^= B.at(i);
}
cout << (x == 0 ? "black\n" : "white\n");
}
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