### A. Subarrays Beauty

**Hint 1**

**Hint 2**

**Hint 3**

justHusam solution: https://ideone.com/PL7s1U

Vendetta. solution: https://ideone.com/23iukT

**Complexity:** *O*(*Nlog*(*Max*(*A*_{i}))).

### B. Array Reconstructing

**Hint 1**

justHusam solution: https://ideone.com/IDqwCe

**Complexity:** *O*(*N*).

### C. Large Summation

**Hint 1**

**Hint 2**

justHusam solution: https://ideone.com/1mSW7q

Vendetta. solution: https://ideone.com/V2wqJT

**Complexity:** *O*(*NLog*(*N*)).

### D. Counting Test

**Hint 1**

**Hint 2**

**Hint 3**

justHusam solution: https://ideone.com/BbGc7w

**Complexity:** *O*(26*N* + *Q*).

### E. Game of Dice

**Hint 1**

**Hint 2**

**Hint 3**

justHusam solution: https://ideone.com/pFtGym

Vendetta. solution: https://ideone.com/udraup

**Complexity:** .

**Note:** *O*(6^{N}) gives TLE because 6^{14} is approximately 78 × 10^{9}.

### F. Strings and Queries

**Hint 1**

**Hint 2**

**Hint 3**

Sparse Table with Hashing solution: https://ideone.com/iVZNHd (Running Time: 1621 ms)

Segment Tree with Hashing solution: https://ideone.com/UPsA6o (Running Time: 2042 ms)

**Complexity:** *O*(*NL*^{2} + *NLog*(*N*) + *Q*(*L* + *Log*(*N*))).

Sparse Table with Trie solution: https://ideone.com/pn4haB (Running Time: 1716 ms)

**Complexity:** *O*(*NL*^{2} + *NLog*(*N*) + *NL* + *QL*).

**Note:** You don't need to worry about collision in hashing since you don't need to use at all, the max hash value will be 4^{30} which is approximately 10^{18} which fits into `long long`

.

### G. Magical Indices

**Hint 1**

**Hint 2**

justHusam solution: https://ideone.com/9SzqJb

**Complexity:** *O*(*N*).

### H. Corrupted Images

**Hint 1**

**Hint 2**

**Hint 3**

justHusam solution: https://ideone.com/wS5TPl

**Complexity:** *O*(*NM*).

### I. The Crazy Jumper

**Solution 1**

**Solution 2**

justHusam solutions:

BFS: https://ideone.com/P2yACH

DP top-down: https://ideone.com/UnBst5

DP buttom-up: https://ideone.com/ysugUh

**Complexity:** *O*(*N*).

### J. The Hell Boy

**Solution 1**

**Solution 2**

Vendetta. solutions:

Math: https://ideone.com/rYmHOD

DP: https://ideone.com/IDWlkQ

**Complexity:** *O*(*N*).

### K. Palindromes Building

**Hint 1**

**Hint 2**

**Hint 3**

justHusam `next_permutation`

solution: https://ideone.com/zaXvKc

**Complexity:** .

**Note:** *O*(*N*!) gives TLE because 20! is approximately 2.4 × 10^{18}.

Vendetta. math solution: https://ideone.com/0BNI2r

**Complexity:** *O*(*N*).