sort函数降序排序

#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int cmp(int a, int b )
{
    if( a > b )
       return 1;
    else
       return 0;
}
int a[] = {1,2,3,4};
int main()
{
    sort(a,a + 4,cmp);
    for(int i = 0; i < 4; i++)
        printf("%d ",a[i]);
    printf("\n");
    return 0;
}