## PAT(A) 1124. Raffle for Weibo Followers (20)

### 1124. Raffle for Weibo Followers (20)

John got a full mark on PAT. He was so happy that he decided to hold

## PAT(A) 1123. Is It a Complete AVL Tree (30)

### 1123. Is It a Complete AVL Tree (30)

An AVL tree is a self-balancing binary search tree. In an AVL tree

## PAT(A) 1122. Hamiltonian Cycle (25)

### 1122. Hamiltonian Cycle (25)

The "Hamilton cycle problem" is to find a simple cycle that contains every

## PAT(A) 1121. Damn Single (25)

### 1121. Damn Single (25)

"Damn Single (单身狗)" is the Chinese nickname for someone who is

## PAT(A) 1120. Friend Numbers (20)

### 1120. Friend Numbers (20)

Two integers are called "friend numbers" if they share the same sum of their

## PAT(A) 1119. Pre- and Post-order Traversals (30)

### 1119. Pre- and Post-order Traversals (30)

Suppose that all the keys in a binary tree are distinct positive

## PAT(A) 1118. Birds in Forest (25)

### 1118. Birds in Forest (25)

Some scientists took pictures of thousands of birds in a forest. Assume

## PAT(A) 1117. Eddington Number(25)

### 1117. Eddington Number(25)

"British astronomer Eddington liked to ride a bike. It is said that in order

## PAT(A) 1116. Come on! Let's C (20)

### 1116. Come on! Let's C (20)

"Let's C" is a popular and fun programming contest hosted by the College

## PAT(A) 1111. Online Map (30)

### 1111. Online Map (30)

Input our current position and a destination, an online map can recommend