二分查找小结
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Templates
These templates come from LeetCode.
Tips
The tip below comes from LeetCode 278. First Bad Version.
If you are setting mid = (left+right) / 2, you have to be very careful. Unless you are using a language that does not overflow such as Python, left + right could overflow. One way to fix this is to use left + (right-left)/2 instead.
If you fall into this subtle overflow bug, you are not alone. Even Jon Bentley‘s own implementation of binary search had this overflow bug and remained undetected for over twenty years.
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