Hello Programmers In this post, you will know how to solve the Counting Pretty Numbers Codechef Solution. The Problem Code: NUM239
One more thing to add, don’t directly look for the solutions, first try to solve the problems of Codechef by yourself. If you find any difficulty after trying several times, then you can look for solutions.
Problem
Vasya likes the number 239239. Therefore, he considers a number pretty if its last digit is 22, 33 or 99.
Vasya wants to watch the numbers between LL and RR (both inclusive), so he asked you to determine how many pretty numbers are in this range. Can you help him?
Input
- The first line of the input contains a single integer TT denoting the number of test cases. The description of TT test cases follows.
- The first and only line of each test case contains two space-separated integers LL and RR.
Output
For each test case, print a single line containing one integer — the number of pretty numbers between LL and RR.
Constraints
- 1≤T≤1001≤T≤100
- 1≤L≤R≤1051≤L≤R≤105
Subtasks
Subtask #1 (100 points): original constraints
Input
2
1 0
11 33
Output
3
8
Explanation
Example case 1: The pretty numbers between 11 and 1010 are 22, 33 and 99.
Example case 2: The pretty numbers between 1111 and 3333 are 1212, 1313, 1919, 2222, 2323, 2929, 3232 and 3333.
Counting Pretty Numbers CodeChef Solutions in CPP
#include<iostream>
using namespace std;
bool isPrettyNumber(int number)
{
// Get last digit of the number
int single_digit = number % 10;
if (single_digit == 2 || single_digit == 3 || single_digit == 9)
return true;
else
return false;
}
int main()
{
int test_cases;
int a, b, counter;
cin >> test_cases;
while (test_cases--)
{
counter = 0;
cin >> a >> b;
for (int i = a; i <= b; i++)
{
if (isPrettyNumber(i))
counter++;
}
cout << counter << endl;
}
return 0;
}Disclaimer: The above Problem (Counting Pretty Numbers) is generated by CodeChef but the solution is provided by BrokenProgrammers. This tutorial is only for Educational and Learning purpose.
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