题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
import java.util.Scanner; // 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); StringBuilder sb1 = new StringBuilder(in.nextLine()); int counter=0; for(int i=0;i<sb1.length();i++){ for(int j=i+1;j<sb1.length();j++){ if(sb1.charAt(j)==sb1.charAt(i)) sb1.setCharAt(j,'}'); } if(sb1.charAt(i)>=0&&sb1.charAt(i)<=127&&sb1.charAt(i)!='}') counter++; } System.out.print(counter); in.close(); } }