Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0.
Assume the environment does not allow you to store 64-bit integers (signed or unsigned).
Example 1:
Input: x = 123
Output: 321
Example 2:
Input: x = -123
Output: -321
Example 3:
Input: x = 120
Output: 21
Example 4:
Input: x = 0
Output: 0
Constraints:
-231 <= x <= 231 - 1
var reverse = function(x) {
let maxnum = Math.pow(2,31)
let result = String(x).split('').reverse()
if(x < 0) {
result.unshift(result.pop())
let final = result.join('')
if( final < -maxnum ) {
return 0
}
else {
return final
}
}
else {
let final = result.join('')
if(final > maxnum-1) {
return 0
}
else {
return final
}
}
};
Runtime: 64 ms, faster than 99.98% of JavaScript online submissions for Reverse Integer.
Memory Usage: 40.3 MB, less than 50.48% of JavaScript online submissions for Reverse Integer.
생각보다 생각할게 조금은 있었던 문제같다.