Create 1498-number-of-subsequences-that-satisfy-the-given-sum-conditi…

…on.kt
Arrrsh · May 22, 2023 · 1b990c8 · 1b990c8
1 parent 975ac00
commit 1b990c8
Showing 1 changed file with 25 additions and 0 deletions.
diff --git a/kotlin/1498-number-of-subsequences-that-satisfy-the-given-sum-condition.kt b/kotlin/1498-number-of-subsequences-that-satisfy-the-given-sum-condition.kt
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+class Solution {
+ fun numSubseq(nums: IntArray, target: Int): Int {
+ nums.sort()
+ val mod = 1000000000 + 7
+
+ val pow = IntArray(nums.size)
+ pow[0] = 1
+ for (i in 0 until nums.size - 1)
+ pow[i + 1] = pow[i] * 2 % mod
+
+ var left = 0
+ var right = nums.lastIndex
+ var res = 0
+ while (left <= right) {
+ if (nums[left] + nums[right] > target) {
+ right--
+ } else {
+ res = (res + pow[right - left]) % mod
+ left++
+ }
+ }
+
+ return res
+ }
+}