解题思路:
import java.io.*; public class Main { public static BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out)); public static StreamTokenizer cin = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in))); public static PrintWriter cout = new PrintWriter(new OutputStreamWriter(System.out)); public static void main(String[] args) throws Exception { String s = in.readLine(); char[] ch = s.toCharArray(); int a = 0, b = 0, c = 0, d = 0; for (int i = 0; i < ch.length; i++) { if ((ch[i] >= 'a' && ch[i] <= 'z') || (ch[i] >= 'A' && ch[i] <= 'Z')) { a++; } else if (ch[i] >= '0' && ch[i] <= '9') { b++; } else if (ch[i] == ' ') { c++; } else { d++; } } cout.printf("%d %d %d %d", a, b, c, d); cout.flush(); } }
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