Update 1755-closest-subsequence-sum.js

Author: everthis

1755-closest-subsequence-sum.js

@@ -1,3 +1,58 @@
+/**
+ * @param {number[]} nums
+ * @param {number} goal
+ * @return {number}
+ */
+const minAbsDifference = function (nums, goal) {
+  let min = Math.abs(goal)
+  if (!nums.length) return min
+  const generateSums = (a) => {
+    let sums = []
+    for (let i = 0; i < a.length; i++) {
+      const l = sums.length
+      for (let j = 0; j < l; j++) {
+        sums.push(sums[j] + a[i])
+        min = Math.min(min, Math.abs(sums[j] + a[i] - goal))
+        if (min === 0) return
+      }
+      sums.push(a[i])
+      min = Math.min(min, Math.abs(a[i] - goal))
+      if (min === 0) return
+    }
+    return sums
+  }
+
+  const n1 = nums.slice(0, Math.ceil(nums.length / 2))
+  const n2 = nums.slice(Math.ceil(nums.length / 2), nums.length)
+  const sums1 = generateSums(n1)
+  if (min === 0) return min
+  const sums2 = generateSums(n2)
+  if (min === 0) return min
+
+  sums2.sort((a, b) => a - b)
+  for (let i = 0; i < sums1.length; i++) {
+    if (min === 0) return min
+    let l = 0
+    let r = sums2.length
+    let sum
+    while (l < r) {
+      const h = Math.floor((l + r) / 2)
+      sum = sums1[i] + sums2[h]
+      min = Math.min(min, Math.abs(sum - goal))
+      if (min === 0) return min
+      if (sum - goal < 0) {
+        l = h + 1
+      } else {
+        r = h
+      }
+    }
+  }
+  return min
+}
+
+
+// another
+
 /**
  * @param {number[]} nums
  * @param {number} goal