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[20230501] Solve Binary Search problems

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🙂easy/2089.Find-Target-Indices-After-Sorting-Array
- find-target-indices-after-sorting-array.py
🤔medium/0852.Peak-Index-in-a-Mountain-Array
- peak-index-in-a-mountain-array.py

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	`1`	`+# 2089. Find Target Indices After Sorting Array`
	`2`	`+# https://leetcode.com/problems/find-target-indices-after-sorting-array/`
	`3`	`+`
	`4`	`+from typing import List`
	`5`	`+`
	`6`	`+`
	`7`	`+class Solution:`
	`8`	`+ def targetIndices(self, nums: List[int], target: int) -> List[int]:`
	`9`	`+ m_cnt = 0`
	`10`	`+ t_cnt = 0`
	`11`	`+`
	`12`	`+ for num in nums:`
	`13`	`+ if num < target:`
	`14`	`+ m_cnt += 1`
	`15`	`+ if num == target:`
	`16`	`+ t_cnt += 1`
	`17`	`+`
	`18`	`+ result = []`
	`19`	`+ for i in range(t_cnt):`
	`20`	`+ result.append(m_cnt + i)`
	`21`	`+`
	`22`	`+ return result`

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	`1`	`+# 852. Peak Index in a Mountain Array`
	`2`	`+# https://leetcode.com/problems/peak-index-in-a-mountain-array/description/`
	`3`	`+`
	`4`	`+from typing import List`
	`5`	`+`
	`6`	`+`
	`7`	`+class Solution:`
	`8`	`+ def peakIndexInMountainArray(self, arr: List[int]) -> int:`
	`9`	`+ start, end = 0, len(arr) - 1`
	`10`	`+ while start <= end:`
	`11`	`+ mid = (start + end) // 2`
	`12`	`+ if arr[mid - 1] < arr[mid] and arr[mid + 1] < arr[mid]:`
	`13`	`+ return mid`
	`14`	`+ if arr[mid-1] < arr[mid]:`
	`15`	`+ start = mid`
	`16`	`+ else:`
	`17`	`+ end = mid`
	`18`	`+ return 0`
	`19`	`+`
	`20`	`+`
	`21`	`+if __name__ == '__main__':`
	`22`	`+ sol = Solution()`
	`23`	`+ # print(sol.peakIndexInMountainArray([3, 4, 5, 1]))`
	`24`	`+ # print(sol.peakIndexInMountainArray([3, 5, 3, 2, 0]))`
	`25`	`+ print(sol.peakIndexInMountainArray([24, 69, 100, 99, 79, 78, 67, 36, 26, 19]))`
	`26`	`+ print(sol.peakIndexInMountainArray([8, 18, 24, 31, 37, 42, 43, 56, 65, 73, 93, 98, 100, 98, 76, 72, 69, 24, 23]))`

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