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?C++???????????????????????std::sort???????????????????????????????greater?less?????????????????????

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#include 
   
    
#include 
    
     
#include 
     
      
using namespace std;
     
    
   

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

??????????????????????????greater???????????????

sort(a, a + len, greater
   
    ());
   

??????????????greater???less?

sort(a, a + len, less
   
    ());
   

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for (int i = 0; i < len; ++i) {
    cout << a[i] << " ";
}
cout << endl;

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