반복문 [Java]

2739번 구구단

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        for(int i = 1; i < 10; i++)
            System.out.println(n + " * " + i + " = " + (n * i));

        sc.close();
    }
}

10950번 A+B-3

문제

풀이

import java.util.Scanner;

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

8393번 합

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        int n = sc.nextInt();
        int sum = 0;
        
        for(int i = 1; i <= n; i++) {
            sum += i;
        }
        System.out.println(sum);
        
        sc.close();
    }
}

25304번 영수증

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int sum =  sc.nextInt();
        int n = sc.nextInt();

        for(int i = 0; i < n; i++){
            int money = sc.nextInt();
            int num = sc.nextInt();

            sum -= money * num;
        }

        if(sum == 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

        sc.close();
    }
}

15552번 빠른 A+B

문제

풀이

import java.io.*;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
            StringTokenizer st;
            
            int n = Integer.parseInt(br.readLine());
            int a = 0;
            int b = 0;
            int sum = 0;

            for(int i = 0; i < n; i ++) {
                st = new StringTokenizer(br.readLine());
                a = Integer.parseInt(st.nextToken());
                b = Integer.parseInt(st.nextToken());

                sum = a + b;
                bw.write(sum + "\n");
            }

            bw.flush();
            bw.close();
        }
        catch (IOException e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }
    }
}

11021번 A+B - 7

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        int a = 0;
        int b = 0;

        for(int i = 1; i <= n; i++) {
            a = sc.nextInt();
            b = sc.nextInt();

            System.out.println("Case #" + i + ": " + (a + b));
        }

        sc.close();
    }
}

11022번 A+B - 8

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        int a = 0;
        int b = 0;

        for(int i = 1; i <= n; i++) {
            a = sc.nextInt();
            b = sc.nextInt();

            System.out.println("Case #" + i +": " + a + " + " + b + " = " + (a + b));
        }
        
        sc.close();
    }
}

2438번 별 찍기 - 1

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        for(int i = 0; i < n; i++) {
            for(int j = 0; j < i + 1; j++) {
                System.out.print("*");
            }      
            System.out.print("\n");
        }

        sc.close();
    }
}

2439번 별 찍기 - 2

문제

풀이

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        
		int n = sc.nextInt();
		
		for (int i = 1; i <= n; i++) {	
			for (int j = n; j > i; j--) {
				System.out.print(" ");
			}
			for (int j = 1; j <= i; j++) {	
				System.out.print("*");
			} 
			System.out.println();
		} 
        
        sc.close();
	} 
}

10871번 X보다 작은 수

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        int a = sc.nextInt();
        int[] arr = new int[n];

        for(int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }

        for(int i = 0; i < n; i++) {
            if(arr[i] < a) {
                System.out.print(arr[i] + " ");
            }
        }

        sc.close();
    }
}

10952번 A+B - 5

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        int a = 0;
        int b = 0;
        
        while(true) {
            a = sc.nextInt();
            b = sc.nextInt();
            
            if(a == 0 && b == 0) {
                break;
            } else {
                System.out.println(a + b);
            } 
        }
        
        sc.close();
    }
}

10951번 A+B - 4

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int a = 0;
        int b = 0;

        while(sc.hasNextInt()) {
            a = sc.nextInt();
            b = sc.nextInt();

            System.out.println(a + b);
        }

        sc.close();
    }
}

1110번 더하기 사이클

문제

풀이

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        int nn = n;
        int cnt = 0;
        int a = 0;
        int b = 0;

        while(true) {
            a = nn / 10;
            b = nn % 10;

            nn = b * 10 + (a + b) % 10;
            cnt++;

            if(nn == n)  {
                break;
            }
        }
        System.out.println(cnt);

        sc.close();
    }
}