题目描述：

LeetCode 513. Find Left Most Element

Given a binary tree, find the leftmost value in the last row of the tree.

Example 1:

Input:

    2
   / \
  1   3

Output:
1

Example 2:

Input:

        1
       / \
      2   3
     /   / \
    4   5   6
       /
      7 ...

题目描述：

LeetCode 504. Base 7

Given an integer, return its base 7 string representation.

Example 1:

Input: 100
Output: "202"

Example 2:

Input: -7
Output: "-10"

Note: The input will be in range of [-1e7, 1e7].

题目大意：

给定一个整数，返回其7进制的字符串 ...

LeetCode Weekly Contest 18b是LeetCode举办的第二十三场正式周赛，共4道题目，比赛时长1.5小时。

比赛链接：https://leetcode.com/contest/leetcode-weekly-contest-18b/

题解列表：

LeetCode 496. Next Greater Element I

LeetCode 506. Relative Ranks

LeetCode 503. Next Greater Element II

LeetCode 498. Diagonal Traverse

题目描述：

LeetCode 498. Diagonal Traverse

Given a matrix of M x N elements (M rows, N columns), return all elements of the matrix in diagonal order.

Example 1:

Input:
[
 [ 1, 2, 3 ],
 [ 4, 5, 6 ],
 [ 7, 8, 9 ]
]
Output:  [1 ...

题目描述：

LeetCode 503. Next Greater Element II

Given a circular array (the next element of the last element is the first element of the array), print the Next Greater Number for every element. The Next Greater Number of a number ...