gistfile1.nim

proc `{}`*[T; R, C](m: TMatrix[T, R, C], n: range[0..99]): TMatrix[T, R.low..R.high-1, C.low..C.high-1] {.noSideEffect.} =
  ## Returns the submatrix of the given matrix
  ## m{23} deletes row 2 and column 3 and returns the result.
  let r = n div 10 mod 10
  let c = n mod 10
  for i in R.low..R.high:
    if i == r:
      continue
    for j in C.low..C.high:
      if j == c:
        continue
      let ro = if i < r: i else: i - 1
      let co = if j < c: j else: j - 1
      result[ro][co] = m[i][j]