Create 1235-maximum-profit-in-job-scheduling.js

Author: everthis

1235-maximum-profit-in-job-scheduling.js

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+/**
+ * @param {number[]} startTime
+ * @param {number[]} endTime
+ * @param {number[]} profit
+ * @return {number}
+ */
+const jobScheduling = function (startTime, endTime, profit) {
+  const items = Array.from({ length: startTime.length }, () => Array(3).fill(0))
+  for (let i = 0; i < startTime.length; i++) {
+    items[i] = [startTime[i], endTime[i], profit[i]]
+  }
+  items.sort((a1, a2) => a1[1] - a2[1])
+  const dpEndTime = []
+  const dpProfit = []
+  dpEndTime.push(0)
+  dpProfit.push(0)
+  for (let item of items) {
+    const s = item[0],
+      e = item[1],
+      p = item[2]
+    let prevIdx = binarySearch(dpEndTime, 0, dpEndTime.length - 1, s + 1)
+    if (prevIdx < 0) {
+      prevIdx = -prevIdx - 1
+    }
+    prevIdx--
+    const currProfit = dpProfit[prevIdx] + p,
+      maxProfit = dpProfit[dpProfit.length - 1]
+    if (currProfit > maxProfit) {
+      dpProfit.push(currProfit)
+      dpEndTime.push(e)
+    }
+  }
+  return dpProfit[dpProfit.length - 1]
+}
+
+function binarySearch(arr, l, r, x) {
+  while (l <= r) {
+    const m = l + ((r - l) >> 1)
+    if (arr[m] === x) return m
+    if (arr[m] < x) l = m + 1
+    else r = m - 1
+  }
+  return -l - 1
+}