- TwoSum (Easy)
- SingleNumber (Easy)
- ValidAnagram(Easy)
- ContainsDuplicate(Easy)
- ContainsDuplicate ||(Easy)
- IntersectionOfTwoArrays(Easy)
- IntersectionOfTwoArrays ||(Easy)
- WordPattern(Easy)
- FirstUniqueCharacterinaString(Easy)
- FindTheDifference(Easy)
总结
- 字符串的题目首先考虑通过计算ascii码能否实现。
- 对比类的题目,考虑使用hash,因为查找为O(1)