[LeetCode] 系统刷题7_Array & numbers & string
2019-05-09 11:22 Johnson_强生仔仔 阅读(344) 评论(0) 编辑 收藏 举报1. 2 D Array
- 如果是在左上到右下的斜线的话，在同一条斜线上的x - y 相等， (x, y) 是该点的坐标
- 如果是在左下到右上的斜线的话，在同一条斜线上的x + y 相等， (x, y) 是该点的坐标
ex. [(1, 1), (1, 2), (1, 3)]
[(2, 1), (2, 2), (2, 3)]
[(3, 1), (3, 2), (3, 3)]
- 行变列 matrix => zip(*matrix)
ex. matrix = [[ 1, 2, 3], => list(zip(*matrix)) = [ (1, 4, 7),
[ 4, 5, 6], (2, 5, 8),
[ 7, 8, 9]] (3, 6, 9)]
- 对于9 * 9 数独， cellIndex = (row //3) * 3 + col //3 ; 另外如果要遍历在（row, col）位置的小正方形的9个位置，利用newRow = (row //3) * 3 + k //3, newCol = (col //3) * 3 + k %3 for k in range(9).
- [LeetCode] 36. Valid Sudoku_Medium tag: Array
- [LeetCode] 957. Prison Cells After N Days_Medium Tag: Array
- [LeetCode]348. Design Tic-Tac-Toe_Medium tag: array
- [LeetCode] 48. Rotate Image_Medium tag: array
- [LeetCode] 66. Plus One_Easy tag: array
- [LeetCode] 157. Read N Characters Given Read4_Easy tag: array
- [LeetCode] 158. Read N Characters Given Read4 II - Call multiple times_Hard tag: array, queue
- [LeetCode] 163. Missing Ranges_Easy tag: array
- [LeetCode] 681. Next Closest Time_Medium tag: array, sort
- [LeetCode] 833. Find And Replace in String_Medium tag: array
- [LeetCode] 289. Game of Life_Medium tag: array
- [LeetCode] 766. Toeplitz Matrix_Easy tag: array
2. Sorted array
- Rotated sorted array
[LeetCode] 189. Rotate Array_Easy tag: Array
Recover Rotated Sorted Array
Reverse Words in a String
[LeetCode] 796. Rotate String_Easy **KMP
- Merge sorted array
[LeetCode] 88. Merge Sorted Array_Easy tag: Two Pointers
Merge Sorted Array II
[LeetCode] 4. Median of Two Sorted Arrays_Hard tag: Array
- Subarray
Best Time to BUy and Sale Stock I, II, III
- Prefix Sum
[LeetCode] 560.Subarray Sum Equals K_Medium tag: Array, Subarray, prefix Sum
- Two pointers
[LeetCode] 15. 3Sum_Medium tag: Array
[LeetCode] 167. Two Sum II - Input array is sorted_Easy tag: Hash/Two pointers
[LeetCode] 5. Longest Palindromic Substring _Medium tag: Two pointers
[LeetCode] 904. Fruit Into Baskets_Medium tag: Two pointers
[LeetCode] 3. Longest Substring Without Repeating Characters_Medium tag: two pointers
[LeetCode] 11. Container With Most Water_Medium tag: two pointers
[LeetCode] 31. Next Permutation_Medium tag: sort, two pointers
[LeetCode] 76. Minimum Window Substring_Hard tag: two pointers
[LeetCode] 159. Longest Substring with At Most Two Distinct Characters_Medium tag: Two pointers
[LeetCode] 809. Expressive Words_Medium tag: array, two pointers
[LeetCode] 259. 3Sum Smaller_Medium tag: Two pointers
2 - Sum, 3 Sum, 4 - SUm, K- SUM, 3- Sum Closest.
Partition Array
- Sorting
[LeetCode] 56. Merge Intervals_Medium Tag: sort
[LeetCode] 252. Meeting Rooms_Easy tag: Sort
[LeetCode] 763. Partition Labels_Medium Tag: sort
[LeetCode] 347. Top K Frequent Elements_Medium tag: Array, Heap
[LeetCode] 973. K Closest Points to Origin_Easy tag: Sort
[LeetCode] 681. Next Closest Time_Medium tag: array, sort
SOrt letters by Case
[LeetCode] 75. Sort Colors_Medium tag: Two pointers
INterleaving Negative & positive numbers
3. Palindrome
[Palindrome] Check any substring in a s is a palindrome or not.
[LeetCode] 131. Palindrome Partitioning_Medium tag: DFS, backtracking, Palindrome
[LeetCode] 5. Longest Palindromic Substring _Medium tag: Two pointers
4. String
[LeetCode] 482. License Key Formatting_Easy tag: String
[LeetCode] 43. Multiply Strings_Medium tag: string
Math:
[LeetCode] 812. Largest Triangle Area_Easy tag: math
[LeetCode] 382. Linked List Random Node_Medium tag: linked list, math
bit
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1542. Find Longest Awesome Substring
