- Prob 124 : How many round to flip alls coins
- Prob 127 : Adition of linked list
- Prob 159 : First recurring character in a string
- Prob 161 : Reversed 32integer bits
- Prob 176 : Are 2 strings mapped?
- Prob 185 : Calcul intersect area between 2 rectangles
- Prob 231 : Rearrange string so that no 2 adjacent characters are the same
- Prob 53 : Queue with 2 stacks
- Prob 60 : Partitioning
- Prob 68 : Number of bishop's attack
- Prob 128 : Tower of Hanoi
- Prob 140 : List of integer with only 2 element once
- Prob 144 : Partition a list of integer in 3 parts
- Prob 151 : Change color of an pixel and all its neighbor
- Prob 222 : Give absolute standardize path
- Prob 228 : Arranges integers of a list to form the largest possible integer
- Prob 150 : Find k nearest point
- Prob 217 : Find the next sparse integer
- Prob 219 : Connect 4
- Prob 226 : Find alphabetical order of character from a dictonnary
- Prob 235 : Find min and max of the array with less than 2*(N-2) comparaisons