题解 | #计算某字符出现次数#

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 sc = new Scanner(System.in);
        String nextLine = sc.nextLine();
        String next = sc.next();
        if (next.length() == 1 && next.charAt(0) == ' ') {
            next = sc.next();
        }
        int length = nextLine.length();
        if (length > 1000 || length == 0) {
            nextLine = sc.nextLine();
        }
        int count = 0;
        int flag = 0;
        if (next.charAt(0) >= 'a' && next.charAt(0) <= 'z') {
            flag = 1;
        } else if (next.charAt(0) >= 'A' && next.charAt(0) <= 'Z') {
            flag = 2;
        }
        for (int i = 0; i < nextLine.length(); i++) {
            char c = nextLine.charAt(i);
            if (flag == 0) {
                if (c == next.charAt(0)) {
                    count++;
                }
                continue;
            }
            int  cFlag = 0;
            if (c >= 'A' && c <= 'Z') {
                cFlag = 2;
                if (flag == cFlag) {
                    if (c == next.charAt(0)) {
                        count++;
                    }
                    continue;
                } else {
                    char newS = (char)(c - 'A' + 'a');

                    if (newS == next.charAt(0)) {
                        
                        count++;
                    }
                    continue;
                }
            }
            if (c >= 'a' && c <= 'z') {
                cFlag = 1;
                if (flag == cFlag) {
                    if (c == next.charAt(0)) {
                        count++;
                    }

                } else {
                    char newS = (char)(c - 'a' + 'A');
                    if (newS == next.charAt(0)) {
                        count++;
                    }
                }
            }


        }
        /**/
        System.out.println(count);
    }
}