[백준/JAVA] 단계별로 풀어보기(3단계) 코드 모음

문제 2739번) 구구단

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

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        StringBuilder sb = new StringBuilder();
        for(int i=1;i<=9;i++) {
            sb.append(N + " * " + i + " = " + i*N).append("\n");
        }
        System.out.print(sb);
    }
}

문제 10950번) A+B-3

import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
        int T = Integer.parseInt(br.readLine());
        StringTokenizer st;
        StringBuilder sb = new StringBuilder();
        int num1, num2;
        for(int i=0;i<T;i++) {
            st = new StringTokenizer(br.readLine());
            num1 = Integer.parseInt(st.nextToken());
            num2 = Integer.parseInt(st.nextToken());
            sb.append(num1+num2).append("\n");
        }
        System.out.print(sb);
    }
}

문제 8393번) 합

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

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int num = Integer.parseInt(br.readLine());
        num = (num*(num+1))/2;
        System.out.println(num);
    }
}

문제 15552번) 빠른 A+B

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

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        int T = Integer.parseInt(br.readLine());
        StringBuilder sb = new StringBuilder();
        StringTokenizer st;
        int num1, num2;
        for(int i=0;i<T;i++) {
            st = new StringTokenizer(br.readLine());
            num1 = Integer.parseInt(st.nextToken());
            num2 = Integer.parseInt(st.nextToken());
            sb.append(num1+num2).append("\n");
        }
        bw.write(sb.toString());
        bw.flush();
    }
}

문제 2741번) N 찍기

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

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        int num = Integer.parseInt(br.readLine());
        for(int i=1;i<=num;i++) {
            sb.append(i).append("\n");
        }
        System.out.print(sb);
    }
}

문제 2742번) 기찍 N

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

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        StringBuilder sb = new StringBuilder();
        for(int i =N;i>=1 ; i--) {
            sb.append(i).append("\n");
        }
        System.out.print(sb);
    }
}

문제 11021번) A+B-7

import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException{

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int T = Integer.parseInt(br.readLine());
        StringTokenizer st;
        int num1, num2;
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<T;i++) {
            st = new StringTokenizer(br.readLine());
            num1 = Integer.parseInt(st.nextToken());
            num2 = Integer.parseInt(st.nextToken());
            sb.append("Case #").append(i+1).append(": ").append(num1+num2).append("\n");
        }
        System.out.print(sb);
    }
}

문제 11022번) A+B-8

import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int T = Integer.parseInt(br.readLine());
        StringBuilder sb = new StringBuilder();
        StringTokenizer st;
        int num1, num2;
        for(int i=0;i<T;i++) {
            st = new StringTokenizer(br.readLine());
            num1 = Integer.parseInt(st.nextToken());
            num2 = Integer.parseInt(st.nextToken());
            sb.append("Case #").append(i+1).append(": ").append(num1).append(" + ").append(num2).append(" = ").append(num1+num2).append("\n");
        }
        System.out.print(sb);
    }
}

문제 2438번) 별 찍기-1

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

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<N;i++) {
            for(int j=0;j<=i;j++) {
                sb.append("*");
            }
            sb.append("\n");
        }
        System.out.print(sb);
    }
}

문제 2439번) 별 찍기-2

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

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<N;i++) {
            for(int j=1;j<N-i;j++) {
                sb.append(" ");
            }
            for(int j=0;j<=i;j++) {
                sb.append("*");
            }
            sb.append("\n");
        }
        System.out.print(sb);
    }
}

문제 10871번) X보다 작은 수

import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());
        int N = Integer.parseInt(st.nextToken());
        int X = Integer.parseInt(st.nextToken());
        StringBuilder sb = new StringBuilder();
        st = new StringTokenizer(br.readLine());
        int num;
        for(int i=0;i<N;i++) {
            num = Integer.parseInt(st.nextToken());
            if(num<X) {
                sb.append(num).append(" ");
            }
        }
        System.out.println(sb);
    }
}

문제 10952번) A+B-5

import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        int num1, num2;
        StringTokenizer st = new StringTokenizer(br.readLine());
        while(true) {
            num1 = Integer.parseInt(st.nextToken());
            num2 = Integer.parseInt(st.nextToken());
            if(num1 == 0 && num2 ==0)
                break;
            sb.append(num1+num2).append("\n");
            st = new StringTokenizer(br.readLine());
        }
        System.out.print(sb);
    }
}

문제 10951번) A+B-4

import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        StringTokenizer st;
        String input;
        int num1, num2;
        while((input=br.readLine())!=null) {
            st = new StringTokenizer(input);
            num1 = Integer.parseInt(st.nextToken());
            num2 = Integer.parseInt(st.nextToken());
            sb.append(num1+num2).append("\n");
        }
        System.out.print(sb);
    }
}

문제 1110번) 더하기 사이클

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

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int num = Integer.parseInt(br.readLine());
        int temp = num;
        int i = 0;
        while(true) {
            temp = (temp/10 + temp%10)%10 + temp%10*10;
            i++;
            if(temp==num)
                break;
        }
        System.out.println(i);
    }
}