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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int lowerBound(int arr[], int n, int key){
  6.     int low = 0;
  7.     int high = n;
  8.     while(low < high){
  9.         int mid =(low + high) / 2;
  10.         if(arr[mid] < key){
  11.             low = mid + 1;
  12.         }
  13.         else{
  14.             high = mid;
  15.         }
  16.         return low;
  17.     }
  18. }
  19.  
  20.  
  21. int upperBound(int arr[], int n, int key){
  22.     int low = 0;
  23.     int high = n;
  24.     while(low < high){
  25.         int mid = (low + high) / 2;
  26.         if(arr[mid] <= key){
  27.             low = mid + 1;
  28.         }
  29.         else{
  30.             high = mid;
  31.         }
  32.         return low;
  33.     }
  34. }
  35.  
  36.  
  37. int main(){
  38.     int arr[] = {1, 3, 3, 3, 4};
  39.     cout <<  lowerBound(arr, 5, 4) << endl << upperBound(arr, 5, 4);
  40.  
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/ayBJTs
language:
C++ (gcc 8.3)
created:
18 hours ago
visibility:
public

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