[1일 1문제] 백준 단계별로 풀어보기 3-7번 (1.8~1.12)

1.8

문제번호 9086

package baekjoon;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Scanner;

public class java_0108 {
	public static void main(String[] args) throws IOException {
		Scanner sc = new Scanner(System.in);
		
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int T = sc.nextInt();
		
		
		for(int i=0; i<T; i++) {
			String S = sc.next().toUpperCase();
	
			bw.write(S.charAt(0));
			bw.write(S.charAt(S.length()-1) + "\n");
			
		}
		bw.flush();
		bw.close();
		sc.close();
	}
}

 

1.9

문제번호 11654

package baekjoon;

import java.util.Scanner;

public class java_0109 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		char a = sc.nextLine().charAt(0);
		int num = (int)a;
		
		System.out.println(num);
	}
}

 

1.10

문제번호 11720

package baekjoon;

import java.util.Scanner;

public class java_0110 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		
		String a = sc.next();
		
		int sum = 0;
		
		for(int i=0; i<a.length(); i++) {
			sum += Integer.parseInt(a.substring(i, i+1));
		}
		System.out.println(sum);
	}
}

 

1.11

문제번호 10809

package baekjoon;

import java.util.Scanner;

public class java_0111 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int[] alpha = new int[26];
		
		for(int i=0; i<alpha.length; i++) {
			alpha[i] = -1;
		}
		
		String s = sc.next().toLowerCase();
		
		for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if (alpha[(int)c - 97] == -1) {
                alpha[(int)c - 97] = i;
            }
        }
        for (int i = 0; i < 26; i++) {
            System.out.print(alpha[i] + " ");
        }
	}
}

 

1.12

문제번호 2675

package baekjoon;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Scanner;

public class java_0112 {
	public static void main(String[] args) throws IOException {
		Scanner sc = new Scanner(System.in);
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int T = sc.nextInt();
		
		for(int i=0; i<T; i++) {
			int R = sc.nextInt();
			String S = sc.next();
			
			for(int j=0; j<S.length(); j++) {
				for(int k=0; k<R; k++) {
					bw.write(S.charAt(j));
				}
			}
			bw.write("\n");
		}
		bw.flush();
		bw.close();
	}
}