[백준]3단계 문제 모음

제목에 링크를 입력하면 해당 문제로 이동합니다.

 

1

2739

구구단

Java

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int x = scan.nextInt();
		
		for(int i=1; i<10; i++)
			System.out.println(x+ " * " + i + " = " + x*i);
		
		scan.close();
	}
		
}

 

2

10950

A+B - 3

Java

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int T = scan.nextInt();
		for(int i=0; i<T; i++) {
			int a = scan.nextInt();
			int b = scan.nextInt();
			System.out.println(a+b);
		}
		
		scan.close();
	}
}

 

3

8393

합

Java

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		for(int x = n-1; x!=0; x--) {
			n += x;
		}
		System.out.println(n);
		scan.close();

	}
}

 

4

15552

빠른 A+B

Java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int T = Integer.parseInt(bfr.readLine());
		
		for(int i=0;  i < T; i++) {
			String A[] = bfr.readLine().split(" ");
			bfw.write(Integer.toString(Integer.parseInt(A[0])+Integer.parseInt(A[1])) + "\n");
			
		}
		bfw.flush();
		bfw.close();
	}

}

 

5

2741

N 찍기

Java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int T = Integer.parseInt(bfr.readLine());
		
		for(int i=0;  i < T; i++) {
			bfw.write(Integer.toString(i+1) + '\n');
		}
		bfw.flush();
		bfw.close();
	}

}

 

5

2741

N 찍기

Java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int T = Integer.parseInt(bfr.readLine());
		
		for(int i=0;  i < T; i++) {
			bfw.write(Integer.toString(i+1) + '\n');
		}
		bfw.flush();
		bfw.close();
	}

}

 

6

2742

기찍 N

Java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));

		int T = Integer.parseInt(bfr.readLine());
		
		for(int i=T;  i > 0; i--) {
			bfw.write(Integer.toString(i));
			bfw.newLine();;
		}
		bfw.flush();
		bfw.close();
		bfr.close();
	}

}

 

7

11021

A+B - 7

Java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int T = Integer.parseInt(bfr.readLine());
		
		for(int i=0;  i < T; i++) {
			String A[] = bfr.readLine().split(" ");
			bfw.write("Case #" + Integer.toString(i+1)+ ": ");
			bfw.write(Integer.toString(Integer.parseInt(A[0])+Integer.parseInt(A[1])));
			bfw.newLine();
			

			
		}
		bfw.flush();
		bfw.close();
		bfr.close();
	}

}

 

8

11022

A+B - 8

Java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int T = Integer.parseInt(bfr.readLine());
		
		for(int i=0;  i < T; i++) {
			String A[] = bfr.readLine().split(" ");
			bfw.write("Case #" + Integer.toString(i+1)+ ": " +A[0] + " + " + A[1] + " = ");
			bfw.write(Integer.toString(Integer.parseInt(A[0])+Integer.parseInt(A[1])));
			bfw.newLine();
			

			
		}
		bfw.flush();
		bfw.close();
		bfr.close();
	}
}

 

9

2438

별 찍기 - 1

Java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int T = Integer.parseInt(bfr.readLine());
		
		for(int i=1;  i < T+1; i++) {
			for(int j=0; j<i; j++)
				bfw.write("*");
			bfw.newLine();
		}
		bfw.flush();
		bfw.close();
		bfr.close();
	}
}

 

10

2439

별 찍기 - 2

Java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int T = Integer.parseInt(bfr.readLine());
		for(int i=1; i<=T; i++) {
			for(int j=0; j<T-i; j++) 
				bfw.write(" ");
			for(int z = 0; z<i; z++)
				bfw.write("*");
			
			bfw.newLine();
		}
		bfw.flush();
		bfw.close();
		bfr.close();
	}
}

 

11

10871

X보다 작은 수

Java

import java.util.Scanner;

public class Main {
	public static void main(String[] args)  {
		Scanner scanner = new Scanner(System.in);
		int A = scanner.nextInt();
		int X = scanner.nextInt();
		int C[] = new int [A];
		for(int i=0; i<A; i++) {
			int N = scanner.nextInt();
			if(N<X) {
				C[i] = N;
			}
		}
		for(int i=0; i<A; i++)
			if(C[i] != 0)
				System.out.print(C[i] + " ");
	}
}