重写cmp函数
#include <iostream>
#include <algorithm>
using namespace std;
bool cmp(int a,int b){
return a > b;
}
int main(){
int a[] = {5,3,7,3,9,4};
sort(a,a+6,cmp);
for(int i = 0;i < 6;i ++){
cout<<a[i]<<" ";
}
return 0;
}