Update 'Search in Rotated Sorted Array'.
- Change 'mid = (start + end) / 2' to 'mid = start + (end - start) / 2'.
Update 'Search in Rotated Sorted Array II'.
- Change 'mid = (start + end) / 2' to 'mid = start + (end - start) / 2'.
Update 'Search a 2D Matrix'.
- Change 'mid = (start + end) / 2' to 'mid = start + (end - start) / 2'.
Update 'Search Insert Position'.
- Change 'mid = (start + end) / 2' to 'mid = start + (end - start) / 2'.