The following are programs I wrote when I was a student. I'll add more of the programs I wrote when I was a student gradually. Discrete Mathematics/Structures and Numerical Analysis Group I The above are handy javascript programs to perform long division of polynomials, to find the greatest common divisor and write it as a linear combination of the numbers, find the least common multiple, find the canonical factorization of a positive integer (write it as a product of primes), find the quotient and the remainder, determine if a number is prime, solve linear and quadratic congruence systems (in Zn), determine if two integers are relatively prime, find the inverse in Zn, find Lagrange polynomial interpolation, Newton polynomial interpolation , natural cubic splines interpolation, clamped cubic splines interpolation, LU factorization, Cholesky factorization, solve a linear system by the Jacobi method or Gauss-Seidel method. Data Structures Sorting Trees Linked Lists Graphs Queues Numerical Analysis Group 1 Coding Theory Group 1 Pattern Recognition Group I Others Program 1 Some common unix commnads.