Java习题练习：A的个数

题目描述思路源代码其他真题

以下是一个 25 行 25 列的字母矩阵，全部由字母 A 和 B 组成。
AAAAAAABABBAABABABAAAAAAA
ABBBBBABBAABBBBBABABBBBBA
ABAAABABBBABAABBBBABAAABA
ABAAABABBBBBAABAABABAAABA
ABAAABABBABABBABABABAAABA
ABBBBBABBBABAABBBBABBBBBA
AAAAAAABABABABABABAAAAAAA
BBBBBBBBABAABABBBBBBBBBBB
AABAABABBAAABBAAABABBBBBA
ABBABABBBABBAAAABBBBAAAAB
BBBBAAABABAABABAABBBAABBA
BBAABABABAAAABBBAABBAAAAA
ABABBBABAABAABABABABBBBBA
AAAABBBBBABBBBAAABBBABBAB
AABAABAAABAAABAABABABAAAA
ABBBBBBBBABABBBBABAABBABA
ABBBAAABAAABBBAAAAAAABAAB
BBBBBBBBABBAAABAABBBABBAB
AAAAAAABBAAABBBBABABAABBA
ABBBBBABBAABABAAABBBABBAA
ABAAABABABBBAAAAAAAAAABAA
ABAAABABABABBBABBAABBABAA
ABAAABABBABBABABAABAABAAA
ABBBBBABABBBBBABBAAAABAAA
AAAAAAABAABBBAABABABBABBA
请问在这个矩阵中有多少个字母A？

这是一道填空题。
看到就知道很简单。
String类来存取输入。之后两个for循环来遍历。如果是A，则满足条件。

特征：暴力，String存储

答案：318 源代码

import java.util.Scanner;

public class Main {	
	public static void main(String[] args) {
	    Scanner in=new Scanner (System.in);//输入的前提语句
	    String [] a=new String[25];//字符串的声明
	    for(int i=0;i<25;i++) {//字符串的输入
	    	a[i]=in.nextLine();
	    }
	    int ans=0;//答案
	    for(int i=0;i<25;i++) {//每行遍历
	    	for(int j=0;j 
其他真题 
链接: 最全的2021蓝桥杯算法课《算法很美》的学习笔记总目录+真题详解.