> For the complete documentation index, see [llms.txt](https://hao-fu-1.gitbook.io/oj/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hao-fu-1.gitbook.io/oj/hash/jian-guo.md).

# 见过

- [Isomorphic Strings](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/isomorphic-strings.md)
- [1346. Check If N and Its Double Exist](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/1346.-check-if-n-and-its-double-exist.md): https://leetcode.com/problems/check-if-n-and-its-double-exist/
- [Two Sum](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/two-sum.md)
- [1396. Design Underground System](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/1396.-design-underground-system.md): https://leetcode.com/problems/design-underground-system/
- [Word Pattern](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/word-pattern.md)
- [957. Prison Cells After N Days](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/957.-prison-cells-after-n-days.md): https://leetcode.com/problems/prison-cells-after-n-days/
- [939. Minimum Area Rectangle](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/939.-minimum-area-rectangle.md): https://leetcode.com/problems/minimum-area-rectangle/
- [Contains Duplicate II](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/contains-duplicate-ii.md)
- [49. Group Anagrams](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/group-anagrams.md): https://leetcode.com/problems/group-anagrams/submissions/
- [Counting Elements](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/counting-elements.md): https://leetcode.com/explore/challenge/card/30-day-leetcoding-challenge/528/week-1/3289/
- [249. Group Shifted Strings](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/249.-group-shifted-strings.md): https://leetcode.com/problems/group-shifted-strings/
- [Bulls and Cows](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/bulls-and-cows.md)
- [146. LRU Cache](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/lru_cache.md): https://leetcode.com/problems/lru-cache/description/
- [460. LFU Cache](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/460.-lfu-cache.md): https://leetcode.com/problems/lfu-cache/description/
- [First Unique Number](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/first-unique-number.md): https://leetcode.com/explore/featured/card/30-day-leetcoding-challenge/531/week-4/3313/
- [432. All O\`one Data Structure](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/432.-all-o-one-data-structure.md): https://leetcode.com/problems/all-oone-data-structure/
- [336. Palindrome Pairs](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/palindrome-pairs.md): https://leetcode.com/problems/palindrome-pairs/description/
- [1282. Group the People Given the Group Size They Belong To](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/1282.-group-the-people-given-the-group-size-they-belong-to.md): https://leetcode.com/problems/group-the-people-given-the-group-size-they-belong-to/
- [166. Fraction to Recurring Decimal](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/fraction-to-recurring-decimal.md): https://leetcode.com/problems/fraction-to-recurring-decimal/description/
- [Unique Word Abbreviation](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/unique-word-abbreviation.md)
- [Task Schedule with Original Order](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/task-schedule-with-original-order.md)
- [Word Abbreviation](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/word-abbreviation.md)
- [1487. Making File Names Unique](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/1487.-making-file-names-unique.md): https://leetcode.com/problems/making-file-names-unique/
- [1365. How Many Numbers Are Smaller Than the Current Number](https://hao-fu-1.gitbook.io/oj/hash/jian-guo/1365.-how-many-numbers-are-smaller-than-the-current-number.md): https://leetcode.com/problems/how-many-numbers-are-smaller-than-the-current-number/


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