1012 数字分类

 1 #include<iostream>
 2 #include<iomanip>
 3 using namespace std;
 4 
 5 int main() {
 6     int n; //测试用例的个数
 7     int a[1000] = { 0 };  //存放输入的数据
 8     cin >> n; //输入正整数
 9     getchar();
10     for (int i = 0; i < n-1; i++) {
11         cin >> a[i];
12         getchar();
13     }
14     cin >> a[n - 1];
15 
16     //计算A1
17     int a1=0;
18     for (int i = 0; i < n; i++) {
19         if (a[i] % 5 == 0 && a[i]%2==0) {
20             a1 += a[i];
21         }
22     }
23 
24     //计算A2
25     int a2 = 0;
26     int b = -1;
27     int judge = 0;
28     for (int i = 0; i < n; i++) {
29         if (a[i] % 5 == 1) {
30             b *= -1;
31             a2 += b * a[i];
32             judge++;
33         }
34     }
35 
36     //计算A3
37     int cnt1 = 0;//计数器1
38     int a3 = 0;
39     for (int i = 0; i < n; i++) {
40         if (a[i] % 5 == 2) {
41             cnt1++;
42         }
43     }
44     a3 = cnt1;
45 
46     //计算A4
47     double a4 = 0;
48     int cnt2 = 0; //计数器2
49     for (int i = 0; i < n; i++) {
50         if (a[i] % 5 == 3) {
51             a4 += a[i];
52             cnt2++;
53         }
54     }
55     if (a4 > 0) {
56         a4 /= cnt2;
57     }
58 
59     //计算A5
60     int max = 0;
61     for (int i = 0; i < n; i++) {
62         if (a[i] % 5 == 4) {
63             if (a[i] >= max) {
64                 max = a[i];
65             }
66         }
67     }
68 
69     //输出
70     if (a1 == 0) cout << "N" << ‘ ‘;
71     else if (a1 > 0) cout << a1 << ‘ ‘;
72 
73     if (judge == 0)cout << "N" << ‘ ‘; //因为a2的结果可能是负，可能为正，也可能为0
74     else cout << a2 << ‘ ‘;                //所以需要一个judge变量，来记录有没有出现除5余数为1的数
75 
76     if (a3 == 0) cout << "N" << ‘ ‘;
77     else if (a3 > 0) cout << a3 << ‘ ‘;
78 
79     if (a4 == 0) cout << "N" << ‘ ‘;  //fixed可以保证是保留小数点后一位
80     else if (a4 > 0) cout <<fixed<<setprecision(1)<< a4 << ‘ ‘;
81      
82     if (max == 0) cout << "N" ;
83     else if (max > 0) cout << max ;
84 
85 
86     return 0;
87 }