Surrounded Rectangle

Server Hacking

Rooms

Codeforces Round 706 (Div. 1) B. Let’s Go Hiking

Codeforces Round 715 (Div. 1) A. Binary Literature

Codeforces Round 713 (Div. 3) F. Education

Codeforces Round 721 (Div. 2) B2. Palindrome Game (hard version)

Codeforces Round 730 (Div. 2) C. Need for Pink Slips

111. Minimum Depth of Binary Tree

Given a binary tree, find its minimum depth.

The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.

Note: A leaf is a node with no children.

Codeforces Round 732 (Div. 1) B. AquaMoon and Chess