Leetcode/June-LeetCoding-Challenge/08-Power-Of-Two/Power-Of-Two.kt at master · AlgoStudyGroup/Leetcode · GitHub

Name: Leetcode/June-LeetCoding-Challenge/08-Power-Of-Two/Power-Of-Two.kt at master · AlgoStudyGroup/Leetcode · GitHub
Rating: 4.4 (4906 reviews)
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classPowerofTwoKotlin231 {

companionobject {
val resultSet =setOf(
1,
2,
4,
8,
16,
32,
64,
128,
256,
512,
1024,
2048,
4096,
8192,
16384,
32768,
65536,
131072,
262144,
524288,
1048576,
2097152,
4194304,
8388608,
16777216,
33554432,
67108864,
134217728,
268435456,
536870912,
1073741824
 )
 }

funisPowerOfTwo(n:Int): Boolean {
return resultSet.contains(n)
 }
/*
 fun isPowerOfTwo(n: Int): Boolean {
 if (n == 1) {
 return true
 }
 var current = 2
 while (current < n && current <= 1073741823) {
 current = current.shl(1)
 }
 return current == n
 }
*/
}

funmain() {
val solution =PowerofTwoKotlin231()
println(solution.isPowerOfTwo(4))
println(solution.isPowerOfTwo(1073741825))
println(solution.isPowerOfTwo(2))
}