_1736.java

package com.fishercoder.solutions;

public class _1736 {
    public static class Solution1 {
        public String maximumTime(String time) {
            StringBuilder sb = new StringBuilder();
            String[] strs = time.split(":");
            String hour = strs[0];
            String min = strs[1];
            if (hour.charAt(0) == '?') {
                if (hour.charAt(1) == '?') {
                    sb.append("23");
                } else if (hour.charAt(1) > '3') {
                    sb.append("1");
                    sb.append(hour.charAt(1));
                } else {
                    sb.append("2");
                    sb.append(hour.charAt(1));
                }
            } else if (hour.charAt(0) == '0' || hour.charAt(0) == '1') {
                if (hour.charAt(1) == '?') {
                    sb.append(hour.charAt(0));
                    sb.append("9");
                } else {
                    sb.append(hour);
                }
            } else if (hour.charAt(0) == '2') {
                if (hour.charAt(1) == '?') {
                    sb.append("23");
                } else {
                    sb.append(hour);
                }
            }
            sb.append(":");
            if (min.charAt(0) == '?') {
                if (min.charAt(1) == '?') {
                    sb.append("59");
                } else {
                    sb.append("5");
                    sb.append(min.charAt(1));
                }
                return sb.toString();
            }
            sb.append(min.charAt(0));
            if (min.charAt(1) == '?') {
                sb.append("9");
            } else {
                sb.append(min.charAt(1));
            }
            return sb.toString();
        }
    }
}