852. Peak Index in a Mountain Array - Easy
用binary search
如果A[mid] < A[mid+1]，說明peak在mid右側，l = mid + 1；否則說明peak在mid右側，r = mid
時間：O(N)，空間：O(1)
class Solution { public int peakIndexInMountainArray(int[] A) { int l = 0, r = A.length - 1; while(l < r) { int mid = l + (r - l) / 2; if(A[mid] < A[mid + 1]) l= mid + 1; else r = mid; } return l; } }
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