超时超时全部超时

#include<iostream>
#include<iomanip>
#include<math.h>
#include<ctime>
#include <string>
using namespace std;
struct temp
{
   int tempa, tempb, tempc;
   int ans;
};
int fun(int a, int b, int c)
{
   if (a <= 0 || b <= 0 || c <= 0)
   {
   	return 1;
   }
   else if (a > 20 || b > 20 || c > 20)
   {
   	return fun(20, 20, 20);
   }
   else if (a < b&&b < c)
   {
   	return (fun(a, b, c - 1) + fun(a, b - 1, c - 1) - fun(a, b - 1, c));
   }
   else 
   {
   	return (fun(a - 1, b, c) + fun(a - 1, b - 1, c) + fun(a - 1, b, c - 1) - fun(a - 1, b - 1, c - 1));
   }
}
int main()
{
   int tempa=0, tempb=0, tempc=0;
   temp *aim = new temp[10000000];
   cin >> tempa >> tempb >> tempc;
   int i = 0; 
   if (tempa != -1 && tempb != -1 && tempc != -1)
   {
   	aim[0].tempa = tempa;
   	aim[0].tempb = tempb;
   	aim[0].tempc = tempc;
   	while (aim[i].tempa != -1 && aim[i].tempb != -1 && aim[i].tempc != -1)
   	{
   		aim[i].ans = fun(aim[i].tempa, aim[i].tempb, aim[i].tempc);
   		i++;
   		cin >> aim[i].tempa >> aim[i].tempb >> aim[i].tempc;
   		if (i > 10)cout << "no";
   	}
   }
   //cout << i << endl;
   for (int j = 0; j < i ; j++)
   {
   	cout << "w(" << aim[j].tempa << "," << aim[j].tempb << "," << aim[j].tempc << ")=" << aim[j].ans<<endl;
   }
   return 0;
}