LeetCode-in-All
416. Partition Equal Subset Sum
Medium
Given a non-empty array nums containing only positive integers, find if the array can be partitioned into two subsets such that the sum of elements in both subsets is equal.
Example 1:
Input: nums = [1,5,11,5]
Output: true
Explanation: The array can be partitioned as [1, 5, 5] and [11].
Example 2:
Input: nums = [1,2,3,5]
Output: false
Explanation: The array cannot be partitioned into equal sum subsets.
Constraints:
1 <= nums.length <= 2001 <= nums[i] <= 100
Solution
class Solution {
fun canPartition(nums: IntArray): Boolean {
var sums = 0
for (num in nums) {
sums += num
}
if (sums % 2 == 1) {
return false
}
sums /= 2
val dp = BooleanArray(sums + 1)
dp[0] = true
for (num in nums) {
for (sum in sums downTo num) {
dp[sum] = dp[sum] || dp[sum - num]
}
}
return dp[sums]
}
}