]#include <iostream>
using namespace std;
bool is_ordered(int a,int b,int c,int d = 0){
if (d)
return (a>b && b>c && c>d) || (a<b && b<c && c<d);
else
return (a>b && b>c) || (a<b && b<c);
}

bool is_increase(int a,int b,int c,int d = 0){
if (d)
return a<b && b<c && c<d;
else
return a<b && b<c;
}

bool is_decrease(int a,int b,int c,int d = 0){
if (d)
return a>b && b>c && c>d;
else
return a>b && b>c;
}

int main(){
int a[] = {1,4,3,2,5};

for (int i = 0;i < 5;++i)
for (int j = i+1;j < 5;++j)
for (int k = j+1;k < 5;++k){
if (is_increase(a[i],a[j],a[k]))
cout << "升序" << a[i] << a[j] << a[k] << "\n";
if (is_decrease(a[i],a[j],a[k]))
cout << "降序" << a[i] << a[j] << a[k] << "\n";
for (int l = k+1;l < 5;++l){
if (is_increase(a[i],a[j],a[k],a[l]))
cout << "升序" << a[i] << a[j] << a[k] << a[l] << "\n";
if (is_decrease(a[i],a[j],a[k],a[l]))
cout << "降序" << a[i] << a[j] << a[k] << a[l] << "\n";
}
}
system("pause");
}[/CODE]