LeetCode in Kotlin
2443. Sum of Number and Its Reverse
Medium
Given a non-negative integer num, return true if num can be expressed as the sum of any non-negative integer and its reverse, or false otherwise.
Example 1:
Input: num = 443
Output: true
Explanation: 172 + 271 = 443 so we return true.
Example 2:
Input: num = 63
Output: false
Explanation: 63 cannot be expressed as the sum of a non-negative integer and its reverse so we return false.
Example 3:
Input: num = 181
Output: true
Explanation: 140 + 041 = 181 so we return true. Note that when a number is reversed, there may be leading zeros.
Constraints:
0 <= num <= 105
Solution
class Solution {
fun sumOfNumberAndReverse(num: Int): Boolean {
for (i in 0..num) {
var n = i
var r = 0
while (n != 0) {
r = r * 10 + n % 10
n /= 10
}
if (r + i == num) {
return true
}
}
return false
}
}