Created
October 16, 2018 18:39
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| def find_first_occ_gd(arr , target): | |
| l , r = 0, len(arr) - 1 | |
| while l + 1 < r: | |
| mid = l + (r - l) // 2 | |
| if arr[mid] == target: | |
| r = mid | |
| elif arr[mid] < target: | |
| l = mid + 1 #可以不加1，不影响当arr[mid] == target的时候 r = mid的设置 | |
| else: | |
| r = mid - 1 #可以不减1，不影响当arr[mid] == target的时候 r = mid的设置 | |
| # post | |
| if arr[l] == target: return l | |
| if arr[r] == target: return r | |
| return -1 |
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