Phone Interview

https://instant.1point3acres.com/thread/236488

• [x] count and say + linked list

https://instant.1point3acres.com/thread/235870

• [x] print 奇偶

   public static int[][] printNumber(int n) {
        int[][] result = new int[n][n];

        for (int i = 0; i < n; ++i) {
            int num = 1;
            int size = i > (n - 1) / 2 ? n - (n - 1 - i) * 2 : (n - i * 2);
            int j = i > (n - 1) / 2 ? n - i - 1 : i;
            for (int k = 0; k < size; ++k) {
                result[i][j++] = num++;
            }
        }

        return result;
    }

https://instant.1point3acres.com/thread/234666

• [x] find same element
• [x] reverse integer

https://instant.1point3acres.com/thread/233435

• [x] singly linked list
• [x] reverse integer
• [x] count and say

https://instant.1point3acres.com/thread/233140

• [x] 2 sum - follow ups

https://instant.1point3acres.com/thread/233217

• [x] buy sell stock

https://instant.1point3acres.com/thread/232861

• [x] valid parentheses and follow ups

https://instant.1point3acres.com/thread/223919

• [x] binary tree path sum
• [x] reverse integer

https://instant.1point3acres.com/thread/223365

• [x] binary tree zigzag traversal

https://instant.1point3acres.com/thread/223538

• [x] spiral matrix

https://instant.1point3acres.com/thread/222742

• [x] merge interval
• [x] print binary tree

https://instant.1point3acres.com/thread/224432

• [x] binary tree level max
• [x] list, dictionary

https://instant.1point3acres.com/thread/219929

• [x] two sum, target

https://instant.1point3acres.com/thread/220293

• [ ] data stream median

https://instant.1point3acres.com/thread/219307

• [x] lc 98, validate BST, recursive and iterative

https://instant.1point3acres.com/thread/217085

• [x] best time to sell stock

https://instant.1point3acres.com/thread/219299

• [x] level order traversal
• [x] data stream median

https://instant.1point3acres.com/thread/214755

• [x] merge two sorted array
• [x] min moves to make all elements equal

1 month before

https://instant.1point3acres.com/thread/211756

• [ ] max stack
• [ ] convert integer to string
• [ ] turn off last significant bit

https://instant.1point3acres.com/thread/212776

• [x] hashmap, 员工 skills
• [ ] blow off binary tree

https://instant.1point3acres.com/thread/211652

• [ ] stock and 代码

https://instant.1point3acres.com/thread/207115

• [ ] stack
• [ ] lc 463 island perimeter

https://instant.1point3acres.com/thread/206655

• [ ] linkedlist
• [ ] invert binary tree

https://instant.1point3acres.com/thread/213460

• [ ] two sum
• [ ] stock

https://instant.1point3acres.com/thread/211246

• [ ] behavior questions
• [ ] random
• [ ] anagram

2 - 3 months before

https://instant.1point3acres.com/thread/205621

• [ ] encode and decode string, lc 271
• [ ] 约瑟夫环

https://instant.1point3acres.com/thread/197138

• [ ] duplicate integers
• [ ] height balanced tree