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Copy pathSearchRange.ts
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34 lines (33 loc) · 1 KB
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/**
* 在排序数组中查找元素的第一个和最后一个位置 返回一个数组[FirstIndex, LastIndex]
* 若不存在该值，则返回[-1, -1]
*
* @param {number[]} nums
* @param {number} target
*/
function SearchRange (nums: number[], target: number): number[] {
let left = 0
let right = nums.length - 1
while (left < right) {
let mid = Math.floor(left + (right - left)/2)
// 如果找到了该值 则继续查找范围
if (nums[mid] === target) {
let midLeft = mid
let midRight = mid
while (nums[midLeft - 1] === target) {
midLeft--
}
while (nums[midRight + 1] === target) {
midRight++
}
return [midLeft, midRight]
} else if (nums[mid] > target) {
right = mid
} else {
left = mid + 1
}
}
// 判断是否存在该值
return nums[left] === target ? [left, left] : [-1, -1]
}
export {SearchRange}