lower bound c++

#include<bits/stdc++.h> using namespace std; int main(){ int n;cin>>n; vector<int>v; for(int i=0;i<n;i++){ cin>>v[i]; } sort(v.begin(),v.end()); //lower bound for vector auto pointer1 = lower_bound(v.begin(), v.end(), 7); cout<<(*pointer1)<<endl; //lower bound for array; int array[n]; for(int i=0;i<n;i++){ cin>>array[i]; } sort(array,array+n); //lowerbound int *pointer2 = lower_bound(array, array+n, 7); //if you want upper bound then just replace lower_bound with upper_bound }

lower_bound c++

// lower_bound/upper_bound example
#include <iostream>     // std::cout
#include <algorithm>    // std::lower_bound, std::upper_bound, std::sort
#include <vector>       // std::vector

int main () {
  int myints[] = {10,20,30,30,20,10,10,20};
  std::vector<int> v(myints,myints+8);           // 10 20 30 30 20 10 10 20

  std::sort (v.begin(), v.end());                // 10 10 10 20 20 20 30 30

  std::vector<int>::iterator low,up;
  low=std::lower_bound (v.begin(), v.end(), 20); //          ^
  up= std::upper_bound (v.begin(), v.end(), 20); //                   ^

  std::cout << "lower_bound at position " << (low- v.begin()) << '\n'; 
  std::cout << "upper_bound at position " << (up - v.begin()) << '\n';

  return 0;
}

// Output
// lower_bound at position 3
// upper_bound at position 6

Posted by: Guest on August-02-2020

Source

// lower_bound/upper_bound example #include <iostream> // std::cout #include <algorithm> // std::lower_bound, std::upper_bound, std::sort #include <vector> // std::vector int main () { int myints[] = {10,20,30,30,20,10,10,20}; std::vector<int> v(myints,myints+8); // 10 20 30 30 20 10 10 20 std::sort (v.begin(), v.end()); // 10 10 10 20 20 20 30 30 std::vector<int>::iterator low,up; low=std::lower_bound (v.begin(), v.end(), 20); // ^ up= std::upper_bound (v.begin(), v.end(), 20); // ^ std::cout << "lower_bound at position " << (low- v.begin()) << '\n'; std::cout << "upper_bound at position " << (up - v.begin()) << '\n'; return 0; }

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