結果

問題 No.8024 等式
ユーザー kimiyuki
提出日時 2017-04-01 02:45:42
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
(最新)
AC  
(最初)
実行時間 -
コード長 1,992 bytes
コンパイル時間 534 ms
コンパイル使用メモリ 57,728 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-06-30 04:13:33
合計ジャッジ時間 2,218 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge5
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ファイルパターン 結果
other AC * 22 WA * 1
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ソースコード

diff #
プレゼンテーションモードにする

#pragma GCC optimize "O3"
#pragma GCC target "avx"
#include <cstdio>
#include <vector>
#include <array>
#include <functional>
#define repeat(i,n) for (int i = 0; (i) < int(n); ++(i))
using namespace std;
struct rational_t {
    double p, q; // q may be 0
    bool operator == (rational_t other) const { return this->p * other.q == this->q * other.p; }
    rational_t operator + (rational_t other) const { return { this->p * other.q + other.p * this->q, this->q * other.q }; }
    rational_t operator - (rational_t other) const { return { this->p * other.q - other.p * this->q, this->q * other.q }; }
    rational_t operator * (rational_t other) const { return { this->p * other.p, this->q * other.q }; }
    rational_t operator / (rational_t other) const { return { this->p * other.q, this->q * other.p }; }
};
rational_t make_rational(double p, double q) { return { p, q }; }
constexpr int max_n = 7;
struct loop_exception {};
bool solve(vector<int> const & a) {
    array<rational_t, max_n> x;
    repeat (i, a.size()) x[i] = make_rational(a[i], 1);
    function<void (int)> go = [&](int n) {
        repeat (j,n) {
            swap(x[j], x[n-1]);
            repeat (i,j) {
                if (x[i] == x[n-1]) {
                    throw loop_exception {};
                }
                if (n == 2) continue;
                rational_t saved = x[i];
                x[i] = saved + x[n-1]; go(n-1);
                x[i] = saved - x[n-1]; go(n-1);
                x[i] = saved * x[n-1]; go(n-1);
                if (x[n-1].p) {
                    x[i] = saved / x[n-1]; go(n-1);
                }
                x[i] = saved;
            }
            swap(x[j], x[n-1]);
        }
    };
    try {
        go(a.size());
    } catch (loop_exception e) {
        return true;
    }
    return false;
}
int main() {
    int n; scanf("%d", &n);
    vector<int> a(n); repeat (i,n) scanf("%d", &a[i]);
    bool found = solve(a);
    printf("%s\n", found ? "YES" : "NO");
    return 0;
}
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