#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main()
{
int n, temp;
int A1 = 0, A2 = 0, A3 = 0, A5 = -1;
double A4 = 0;
cin >> n;
vector<int> v1, v2, v3, v4, v5;
for (int i = 0; i < n; i++) {
cin >> temp;
switch (temp % 5) {
case 0: if (temp % 10 == 0) v1.push_back(temp); break;
case 1: if (temp % 5 == 1) v2.push_back(temp); break;
case 2: if (temp % 5 == 2) v3.push_back(temp); break;
case 3: if (temp % 5 == 3) v4.push_back(temp); break;
case 4: if (temp % 5 == 4) v5.push_back(temp); break;
}
}
//求和
for (int i = 0; i < v1.size(); i++) {
A1 += v1[i];
}
//交错求和
bool isPositive = true;//正负交错的key
for (int i = 0; i < v2.size(); i++) {
if (isPositive) A2 += v2[i];
else A2 -= v2[i];
isPositive = !isPositive;
}
//计数
for (int i = 0; i < v3.size(); i++) {
A3++;
}
//平均数
for (int i = 0; i < v4.size(); i++) {
A4 += v4[i];
}
A4 = A4 / v4.size();
//最大数字
for (int i = 0; i < v5.size(); i++) {
if (v5[i] > A5) A5 = v5[i];
}
//输出,这边使用空判断更准确,否则会有一个失误
if (v1.size() == 0) cout << "N "; else cout << A1 << " ";
if (v2.size() == 0) cout << "N "; else cout << A2 << " ";
if (v3.size() == 0) cout << "N "; else cout << A3 << " ";
if (v4.size() == 0) cout << "N "; else printf("%.1f ", A4);
if (v5.size() == 0) cout << "N"; else cout << A5;
return 0;
}
PAT乙级1012:数字分类
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转载自blog.csdn.net/weixin_43699840/article/details/105323695
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