题解 | #删除字符串中出现次数最少的字符#
删除字符串中出现次数最少的字符
https://www.nowcoder.com/practice/05182d328eb848dda7fdd5e029a56da9
import java.util.Scanner; import java.util.Map; import java.util.HashMap; import java.lang.Character; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); // 注意 hasNext 和 hasNextLine 的区别 while (in.hasNextLine()) { // 注意 while 处理多个 case String a = in.nextLine(); System.out.println(solution(a)); } } public static String solution(String str) { Map<Character, Integer> countMap = new HashMap<>(); for (int i = 0; i < str.length(); i++) { char cha = str.charAt(i); Integer count = countMap.get(cha); if (null == count) { countMap.put(cha, 1); } else { countMap.put(cha, count+1); } } Integer min = null; for (Integer val : countMap.values()) { if (null == min) { min = val; } else { min = val < min ? val : min; } } for (Character cha : countMap.keySet()) { if (countMap.get(cha).equals(min)) { str = str.replace(String.valueOf(cha), ""); } } return str; } }