Project Euler

Project Euler is a website dedicated to a series of computational problems intended to be solved with computer programs. Problems are of varying difficulty but each is solvable in less than a minute using an efficient algorithm on a modestly powered computer.

How to run my programs on Mac OS

C

• Instal Xcode
• To run gcc without GUI, type in terminal 'xcode-select --install'
• Compile your program: 'gcc program.c'
• Type './a.out'

How to run my programs on Windows

Ruby

• Instal RubyInstaller
• Launch program named "Start Command Prompt with Ruby"
• Type "ruby program.rb"

C

• Instal GCC using MinGW
• Go to My Computer/Properties/Advanced System Settings/Environment Variable
• Go to the System Variable, find 'path' then double click on it
• Add 'C:\MinGW\bin' at the end
• In the Command Prompt, compile your program: 'gcc program.c'
• Type 'a.exe'

Problems

1. Multiples of 3 and 5
2. Even Fibonacci numbers
3. Largest prime factor
4. Largest palindrome product
5. Smallest multiple
6. Sum square difference
7. 10001st prime
8. Largest product in a series
9. Special Pythagorean triplet
10. Summation of primes
11. Largest product in a grid
12. Highly divisible triangular number
13. Large sum
14. Longest Collatz sequence
15. Lattice paths
16. Power digit sum