Ideal Number

**Problem :**Contest Page | CodeChef
Difficulty : easy
Explanation : Let’s use brute force the find the answer.
You may find the answer is not too large (i.e. not bigger than 2*10^7), then you
can find it in the given time limit.
You can check every possible answer from 1 (or from 19), until we find the k-th
perfect integer.
That’s all what we need to do.
#include <bits/stdc++.h>
using namespace std;
int cal(int num){
int ans = 0;
while (num){
ans += num % 10;
num /= 10;
return ans;
int n;
int main(){
int ans = 0;
while (n){
if (cal(ans) == 10) n–;