习题合集各种有意义的题目

Posted 2021-12-15 phemiku

**1.

# include <iostream>
# define LOCAL
using namespace std;
 
int main()
/*    # ifdef LOCAL
        freopen("C:\\Users\\Administrator\\Desktop\\新建文本文档.txt", "r", stdin);
        freopen("C:\\Users\\Administrator\\Desktop\\新建文本文档2.txt", "w", stdout);
    # endif */
    int a, b, c, flag = 0, count = 0;
    while(cin >> a >> b >> c)
        count++;
        flag = 0;
        for(int i = 0; i < 34; i++)
            int num = 3 * i + a;
            if(num % 5 == b && num % 7 == c && num >0 && num < 100)
                cout << "Case " << count << ": " << num << endl;
                flag = 1;
            
        
        if(!flag)
            cout << "Case " << count << ": " << "NO answer!" << endl;
    

 

**2.习题2-6 排列（ permutation）
用1， 2， 3， …， 9组成3个三位数abc， def和ghi， 每个数字恰好使用一次， 要
求abc： def： ghi＝ 1： 2： 3。 按照“abc def ghi”的格式输出所有解， 每行一个解。 

# include <iostream>
using namespace std;
 
void Judge(int array[], int num)
    int a = num % 10, b = num / 10 % 10, c = num / 100;
    array[a]++; array[b]++; array[c]++;

 
int main()
    for(int i = 100; i < 334; i++)
        int a[10] = 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
        int abc = i * 1, def = i * 2, ghi = i * 3, j;
        Judge(a, abc); Judge(a, def); Judge(a, ghi);
        for(j = 1; j < 10; j++)
            if(a[j] != 1 || a[0] != 0)
                break;
        
        if(j == 10)
            cout << abc << ‘ ‘ << def << ‘ ‘ << ghi << endl;