[알고리즘문제풀기] 다항식 더하기

문제

내가 작성한 정답

class Solution {
    public String solution(String polynomial) {
       
        int x = 0, c = 0;
        for(String s:polynomial.split(" ")){
            if(s.contains("x")) {
                String ss = s.replace("x", "");
                x += ss.isEmpty()?1:Integer.parseInt(ss);
            }
            else if(s.equals("+")) continue;
            else c += Integer.parseInt(s);
        } 
        if(x==0) return c+"";
        else if(x==1) return c==0?"x":"x + "+c;
        else return c==0? x+"x":x+"x + "+c;
    }
}

다른 사람들의 정답

class Solution {
    public String solution(String polynomial) {
        int xCount = 0;
        int num = 0;

        for (String s : polynomial.split(" ")) {
            if (s.contains("x")) {
                xCount += s.equals("x") ? 1 : Integer.parseInt(s.replaceAll("x", ""));
            } else if (!s.equals("+")) {
                num += Integer.parseInt(s);
            }
        }
        return (xCount != 0 ? xCount > 1 ? xCount + "x" : "x" : "") + (num != 0 ? (xCount != 0 ? " + " : "") + num : xCount == 0 ? "0" : "");
    }
    
    
    
import java.util.StringTokenizer;

class Solution {
    public String solution(String polynomial) {
        StringTokenizer st = new StringTokenizer(polynomial, " + ");
        StringBuilder sb = new StringBuilder();

        int xsum = 0;
        int sum = 0;
        while (st.hasMoreTokens()) {
            String str = st.nextToken();

            if (str.contains("x")) {
                String x = str.replace("x", "");
                System.out.println(x);
                if (x.isBlank()) {
                    xsum += 1;
                } else {
                    xsum += Integer.parseInt(x);
                }
            } else {
                sum += Integer.parseInt(str);
            }
        }

        if (xsum == 0) {
            sb.append(sum);
        } else if (sum == 0) {
            if (xsum == 1) {
                sb.append("x");
            } else {
                sb.append(xsum).append("x");
            }
        } else {
            if (xsum == 1) {
                sb.append("x").append(" + ").append(sum);
            } else {
                sb.append(xsum).append("x").append(" + ").append(sum);    
            }

        }

        return sb.toString();
    }
}