- Problem #4 (2) -|- Simple calculator: solution
- Problem #5 (2) -|- Count anagrams: solution
- Problem #6 (1) -|- 30 pi decimal digits: solution
- Problem #6 (3) -|- Nim: solution
- Problem #7 (2) -|- Draw fractals using L-system: solution
- Problem #14 (2) -|- Sieve of Sundaram: solution
- Problem #17 (3) -|- Tic-Tac-Toe: solution
- Problem #18 (3) -|- Square spiral: solution
- Problem #19 (3) -|- Index words: solution
- Problem #40 (2) -|- Kaprekar routine: solution
- Problem #67 (2) -|- Missing pair: solution
- Problem #183 (1) -|- Semver: solution
- Problem #184 (2) -|- Radioactive decay: solution
- Problem #192 (2) -|- Markov chain error detection: solution