title: Ugly Numbers
signature: ugly_numbers <- function(n) {
source_py: def ugly_numbers(n):
      ugly = ([0] * n)
      ugly[0] = 1
      i2 = i3 = i5 = 0
      next_multiple_of_2 = 2
      next_multiple_of_3 = 3
      next_multiple_of_5 = 5
      for l in range(1, n):
          ugly[l] = min(next_multiple_of_2, next_multiple_of_3, next_multiple_of_5)
          if (ugly[l] == next_multiple_of_2):
              i2 += 1
              next_multiple_of_2 = (ugly[i2] * 2)
          if (ugly[l] == next_multiple_of_3):
              i3 += 1
              next_multiple_of_3 = (ugly[i3] * 3)
          if (ugly[l] == next_multiple_of_5):
              i5 += 1
              next_multiple_of_5 = (ugly[i5] * 5)
      return ugly[(- 1)]
source_cpp: unsigned ugly_numbers(unsigned n) {
    unsigned ugly [ n ];
    unsigned i2 = 0, i3 = 0, i5 = 0;
    unsigned next_multiple_of_2 = 2;
    unsigned next_multiple_of_3 = 3;
    unsigned next_multiple_of_5 = 5;
    unsigned next_ugly_no = 1;
    ugly [ 0 ] = 1;
    for ( int i = 1;
    i < n;
    i ++ ) {
      next_ugly_no = min ( next_multiple_of_2, min ( next_multiple_of_3, next_multiple_of_5 ) );
      ugly [ i ] = next_ugly_no;
      if ( next_ugly_no == next_multiple_of_2 ) {
        i2 = i2 + 1;
        next_multiple_of_2 = ugly [ i2 ] * 2;
      }
      if ( next_ugly_no == next_multiple_of_3 ) {
        i3 = i3 + 1;
        next_multiple_of_3 = ugly [ i3 ] * 3;
      }
      if ( next_ugly_no == next_multiple_of_5 ) {
        i5 = i5 + 1;
        next_multiple_of_5 = ugly [ i5 ] * 5;
      }
    }
    return next_ugly_no;
  }