题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
经典的思路
public class Main{
public static void main(String[] args){
Scanner scan = new Scanner(System.in);
String str = scan.nextLine();
int[] count = new int[129];
for(char c : str.toCharArray()){
count[c]++;
}
int sum = 0;
for(int i : count){
if(i>0){
sum++;
}
}
System.out.println(sum);
}
}
