整数奇偶排序无法运行

Question

在vs可以运行的 但是提交会报错 问哪里有问题？

#include<algorithm>
using  namespace std;
bool camparea(int a,int b)
{   return a > b;}
bool campareb(int a, int b)
{   return a < b;}
bool rulea(int a)
{  return a % 2!=0;}
bool ruleb(int b)
{   return b % 2 == 0;}

int main()
{   int s=0,i,ary[10];
    for (i = 0; i < 10; i++)
    {       cin >> ary[i];
        if (ary[i] % 2 == 0)
            s++;    }
    int* a = new int[10 - s];
    int* b = new int[s];
    copy_if(ary, ary+10, a, rulea);
    copy_if(ary, ary+10, b, ruleb);
    sort(a, a + 10-s, camparea);
    sort(b, b + s, campareb);
    for (i = 0; i < 10-s; i++)
        cout << a[i]<<" ";
    for (i = 0; i < s; i++)
        cout << b[i] << " ";}

Answer 1

copy_if 在一些编译器可能不支持。
自己写一个实现的替换

template <class InputIterator, class OutputIterator, class UnaryPredicate>
  OutputIterator copy_if (InputIterator first, InputIterator last,
                          OutputIterator result, UnaryPredicate pred)
{
  while (first!=last) {
    if (pred(*first)) {
      *result = *first;
      ++result;
    }
    ++first;
  }
  return result;
}