Create 715-range-module.js

Author: everthis

715-range-module.js

@@ -0,0 +1,125 @@
+const RangeModule = function() {
+  this.range = []
+}
+
+/**
+ * @param {number} left
+ * @param {number} right
+ * @return {void}
+ */
+RangeModule.prototype.addRange = function(left, right) {
+  let index1 = this.range.length
+  let low = 0
+  let high = this.range.length - 1
+  while (low <= high) {
+    const mid = (low + high) >> 1
+    if (this.range[mid][1] >= left) {
+      index1 = Math.min(index1, mid)
+      high = mid - 1
+    } else {
+      low = mid + 1
+    }
+  }
+
+  let index2 = -1
+  low = 0
+  high = this.range.length - 1
+  while (low <= high) {
+    const mid = (low + high) >> 1
+    if (this.range[mid][0] <= right) {
+      index2 = Math.max(index2, mid)
+      low = mid + 1
+    } else {
+      high = mid - 1
+    }
+  }
+
+  if (index1 === this.range.length) {
+    this.range.push([left, right])
+    return
+  } else if (index2 === -1) {
+    this.range.unshift([left, right])
+    return
+  }
+  left = Math.min(left, this.range[index1][0])
+  right = Math.max(right, this.range[index2][1])
+  this.range.splice(index1, index2 - index1 + 1, [left, right])
+}
+
+/**
+ * @param {number} left
+ * @param {number} right
+ * @return {boolean}
+ */
+RangeModule.prototype.queryRange = function(left, right) {
+  let index = -1
+  let low = 0
+  let high = this.range.length - 1
+  while (low <= high) {
+    const mid = (low + high) >> 1
+    if (this.range[mid][0] <= left) {
+      index = Math.max(index, mid)
+      low = mid + 1
+    } else {
+      high = mid - 1
+    }
+  }
+  if (index === -1 || this.range[index][1] < right) {
+    return false
+  }
+  return true
+}
+
+/**
+ * @param {number} left
+ * @param {number} right
+ * @return {void}
+ */
+RangeModule.prototype.removeRange = function(left, right) {
+  let index1 = this.range.length
+  let low = 0
+  let high = this.range.length - 1
+  while (low <= high) {
+    const mid = (low + high) >> 1
+    if (this.range[mid][1] >= left) {
+      index1 = Math.min(index1, mid)
+      high = mid - 1
+    } else {
+      low = mid + 1
+    }
+  }
+
+  let index2 = -1
+  low = 0
+  high = this.range.length - 1
+  while (low <= high) {
+    const mid = (low + high) >> 1
+    if (this.range[mid][0] <= right) {
+      index2 = Math.max(index2, mid)
+      low = mid + 1
+    } else {
+      high = mid - 1
+    }
+  }
+
+  if (index1 === this.range.length || index2 === -1) {
+    return
+  }
+
+  const newRange = []
+  if (left > this.range[index1][0]) {
+    newRange.push([this.range[index1][0], left])
+  }
+  if (right < this.range[index2][1]) {
+    newRange.push([right, this.range[index2][1]])
+  }
+  this.range.splice(index1, index2 - index1 + 1, ...newRange)
+}
+
+/**
+ * Your RangeModule object will be instantiated and called as such:
+ * var obj = new RangeModule()
+ * obj.addRange(left,right)
+ * var param_2 = obj.queryRange(left,right)
+ * obj.removeRange(left,right)
+ */