Create 1713-minimum-operations-to-make-a-subsequence.js

Author: everthis

1713-minimum-operations-to-make-a-subsequence.js

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+/**
+ * @param {number[]} target
+ * @param {number[]} arr
+ * @return {number}
+ */
+const minOperations = function (target, arr) {
+  let length1 = target.length,
+    length2 = arr.length
+  const targetMap = new Map()
+  for (let i = 0; i < length1; i++) targetMap.set(target[i], i)
+  const list = new Array()
+  for (let i = 0; i < length2; i++) {
+    let num = arr[i]
+    if (targetMap.has(num)) list.push(targetMap.get(num))
+  }
+  let longestIncreasing = lengthOfLIS(list)
+  return target.length - longestIncreasing
+
+  function lengthOfLIS(list) {
+    let length = 1,
+      size = list.length
+    if (size == 0) return 0
+    const d = new Array(size + 1).fill(0)
+    d[length] = list[0]
+    for (let i = 1; i < size; ++i) {
+      if (list[i] > d[length]) {
+        d[++length] = list[i]
+      } else {
+        let left = 1,
+          right = length,
+          pos = 0
+        while (left <= right) {
+          let mid = (left + right) >> 1
+          if (d[mid] < list[i]) {
+            pos = mid
+            left = mid + 1
+          } else {
+            right = mid - 1
+          }
+        }
+        d[pos + 1] = list[i]
+      }
+    }
+    return length
+  }
+}