Codeforces 문제 푸는 길 - 266A Stones on the Table

1804 단어 Codeforces
A. Stones on the Table
time limit per test
2 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output
There are n stones on the table in a row, each of them can be red, green or blue. Count the minimum number of stones to take from the table so that any two neighboring stones had different colors. Stones in a row are considered neighboring if there are no other stones between them.
Input
The first line contains integer n (1 ≤ n ≤ 50) — the number of stones on the table.
The next line contains string s, which represents the colors of the stones. We'll consider the stones in the row numbered from 1 to nfrom left to right. Then the i-th character s equals "R", if the i-th stone is red, "G", if it's green and "B", if it's blue.
Output
Print a single integer — the answer to the problem.
Examples
input
3
RRG

output
1

input
5
RRRRR

output
4

input
4
BRBG

output
0

제목 대의: 서로 다른 색깔의 스톤스는 최소한 몇 개의 스톤스를 가져가야만 서로 인접한 스톤스의 다른 색깔을 구할 수 있다.
문제풀이 사고방식: 물문제, 폭력 스캐닝.
다음은 문제풀이 코드(java 구현)
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		scanner.nextLine();
		String str = scanner.nextLine();
		char[] ch = str.toCharArray();
	
		int counts = 0;
		for(int i = 0;i < ch.length-1;i++){
			if(ch[i] == ch[i+1]){
				counts++;
			}
		}
		System.out.println(counts);		
		scanner.close();				
	}
}

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