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Count all possible N digit numbers that satisfy the given condition in C++
In this tutorial, we will be discussing a program to find the number of possible N digit numbers that satisfy the given condition.
For this we will be provided with an integer. Our task is to check which one of number having N digits follow
Number + Reverse(Number) = 10N -1
Example
#include <bits/stdc++.h> using namespace std; //returning the count of numbers string count_num(int N){ if (N % 2 == 1) return 0; string result = "9"; for (int i = 1; i <= N / 2 - 1; i++) result += "0"; return result; } int main(){ int N = 4; cout << count_num(N); return 0; }
Output
90
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