Count of all even numbers in the range [ L , R ] whose sum of digits is divisible by 3 | C ++ implementation of the approach ; Function to return the count of required numbers ; Count of numbers in range which are divisible by 6 ; Driver code
#include <bits/stdc++.h> NEW_LINE using namespace std ; int countNumbers ( int l , int r ) { return ( ( r / 6 ) - ( l - 1 ) / 6 ) ; } int main ( ) { int l = 1000 , r = 6000 ; cout << countNumbers ( l , r ) ; return 0 ; }