leetcode 1281번 문제풀이

 

https://leetcode.com/problems/subtract-the-product-and-sum-of-digits-of-an-integer/

Subtract the Product and Sum of Digits of an Integer - LeetCode

 

Given an integer number n, return the difference between the product of its digits and the sum of its digits.

 

Example 1:

Input: n = 234

Output: 15

Explanation: Product of digits = 2 * 3 * 4 = 24 Sum of digits = 2 + 3 + 4 = 9 Result = 24 - 9 = 15

 

Example 2:

Input: n = 4421

Output: 21

Explanation: Product of digits = 4 * 4 * 2 * 1 = 32 Sum of digits = 4 + 4 + 2 + 1 = 11 Result = 32 - 11 = 21

 

 

    public int subtractProductAndSum(int n) {
    	// 입력받은 숫자 n을 String으로 변환
        String numToStr = Integer.toString(n);
        Stack stack = new Stack();
        
        // String으로 변환한 numToStr의 문자를 하나씩 배열로 추출해 스택에 넣음.
        for(char c : numToStr.toCharArray()) {
            stack.push(Character.getNumericValue(c));
        }

        int multipleResult = 1;
        int sumResult = 0;
        while(!stack.isEmpty()) {
        // 스택에 하나씩 꺼내면서 num에 값 할당
            int num = (int)stack.pop();
            multipleResult *= num;
            sumResult += num;
        }

        return multipleResult - sumResult;
    }

 

제출

https://leetcode.com/submissions/detail/315831273/