Use not1() to reverse sort v : not1 « STL Algorithms Helper « C++ Tutorial

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2. STL Algorithms Helper
3. not1

#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>

using namespace std;

int main()
{
  vector<char> v;

  for(int i=0; i < 26; i++) v.push_back('A'+i);

  // Use not2() to reverse sort v.
  sort(v.begin(), v.end(), not2(less<char>()));
  
  return 0;
}