Integer depth ( 6 kyu )

Integer depth ( 6 kyu )

문제

The depth of an integer n is defined to be how many multiples of n it is necessary to compute before all 10 digits have appeared at least once in some multiple.

example:

let see n=42

Multiple         value         digits     comment
42*1              42            2,4
42*2              84             8         4 existed
42*3              126           1,6        2 existed
42*4              168            -         all existed
42*5              210            0         2,1 existed
42*6              252            5         2 existed
42*7              294            9         2,4 existed
42*8              336            3         6 existed
42*9              378            7         3,8 existed

Looking at the above table under digits column you can find all the digits from 0 to 9, Hence it required 9 multiples of 42 to get all the digits. So the depth of 42 is 9. Write a function named computeDepth which computes the depth of its integer argument.Only positive numbers greater than zero will be passed as an input.

몇까지 곱했을 때 0부터 9까지 나오는지 구하는 문제

풀이

function computeDepth (x){
  let result = '', count =1
  while ( [...new Set(result)].length < 10 ) {
    result += x*count;
    count++;
  }
  return count-1;
}

Set을 이용해 중복을 제거해 length로 10이 될때까지 반복문을 돌며 count

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