#789026 (C++23) No.25 有限小数

• 問題: No.25 有限小数
• ユーザー: momoyuu
• 提出日時: 2022-08-16 14:20:30
• 言語: C++23 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 2 ms / 5,000 ms
• コード長: 1,673 bytes
• コンパイル時間: 2,839 ms
• コンパイル使用メモリ: 247,456 KB
• 実行使用メモリ: 6,820 KB
• 最終ジャッジ日時: 2024-10-03 05:30:52
• 合計ジャッジ時間: 3,197 ms
• ジャッジサーバーID （参考情報）: judge5 / judge3

ファイルパターン	結果
other	AC * 31

ソースコード

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#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define rep(i,a,b) for (int i = a; i < b; i++)
#define irep(i,a,b) for (int i = a; i > b; i--)
#define print(n) cout << n << endl
#define rup(a,b) (a+b-1)/b
#define end endl;
using namespace std;
unsigned ll gcd(unsigned ll a,unsigned ll b){
    if (a<b){
        swap(a,b);
    }
    if (b==0) return a;
    return gcd(b,a%b);
}
unsigned ll calc(unsigned ll N){
            string s = to_string(N);
        char now1 = '1';
        rep(i,0,s.size()){
            if (s[i]=='0'){
                continue;
            }
            now1 = s[i];
        }
        return (unsigned ll)(now1-'0');
}
int main(){
    cout << fixed << setprecision(15);
    
    unsigned ll N,M;
    cin>>N>>M;
    unsigned ll d;
    bool p = false;
    d = gcd(N,M);
    N /= d;
    M /= d;
    unsigned ll now = 1;
    int count = 0;
    while(true){
        count ++ ;
        if (count>=100) break;
        d = gcd(M,10);
        if (d==1) break;
        M /= d;
        now *= (10/d);
        now = calc(now);
        //cout<<now<<" "<<M<<end;
        }
    if (M == 1){
        string s = to_string(N);
        char now1 = '1';
        rep(i,0,s.size()){
            if (s[i]=='0'){
                continue;
            }
            now1 = s[i];
        }
        N = now * (int)(now1-'0');
        //cout<<now<<" "<<N<<" "<<(int)(now1-'0')<<endl;
        s = to_string(N);
        now1 = '1';
        rep(i,0,s.size()){
            if (s[i]=='0'){
                continue;
            }
            now1 = s[i];
        }print(now1);
    }else{
        print(-1);
    }
    //system("pause");
    return 0;
}
 
 
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