Use lower_bound to locate the first point at which 5 can be inserted in order : lower_bound « STL Algorithms Binary search « C++ Tutorial

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C++ Tutorial » STL Algorithms Binary search » lower_bound 
26.3.2.Use lower_bound to locate the first point at which 5 can be inserted in order
#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main()
{
   const int SIZE = 10;
   int a1[] 224446666};
   vector< int > va1, a1 + SIZE );

   vector< int >::iterator lower;

   cout << "\n\nUse lower_bound to locate the first point\n" << "at which 5 can be inserted in order";
   lower = lower_boundv.begin(), v.end());
   cout << "\n   Lower bound of 5 is element " << lower - v.begin() ) << " of vector v";

   return 0;
}
26.3.lower_bound
26.3.1.Return an iterator from std::lower_bound
26.3.2.Use lower_bound to locate the first point at which 5 can be inserted in order
26.3.3.Lower bound of 6
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