백준 #2 조건문 - Java 풀이 모음 (1330, 9498, 2753, 14681, 2884, 2525, 2480)

안녕하세요. 맹꽁이입니다. 이번엔 백준 사이트 단계별 문제풀이의 조건문 풀어볼게요.

 

입출력 어려운 분들은 아래 1# 입출력과 사칙연산 참고하시길!

https://rb-cloud.tistory.com/4

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#2557 - 두 수 비교하기

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.BufferedReader;
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 a = Integer.parseInt(st.nextToken());
        int b = Integer.parseInt(st.nextToken());

        if(a>b) System.out.print(">");
        else if(a<b) System.out.print("<");
        else System.out.print("==");
    }
}

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#9498 - 시험 성적

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

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

        int a = Integer.parseInt(br.readLine());
        String score = "F";

        if(a>=90) score = "A";
        else if(a>=80) score = "B";
        else if(a>=70) score = "C";
        else if(a>=60) score = "D";

        System.out.print(score);
    }
}

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#2753 - 윤년

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

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

        int a = Integer.parseInt(br.readLine());

        if((a%4==0 && a%100!=0) || a%400==0) System.out.print("1");
        else System.out.print("0");
    }
}

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#14681 - 사분면 고르기

이번에는 한 줄에 두 정수가 있는게 아니기 때문에 tokenizer 없이 readLine()할 것이다.

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

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

        int a = Integer.parseInt(br.readLine());
        int b = Integer.parseInt(br.readLine());

        if(a>0) {
            if(b>0) System.out.print("1");
            else System.out.print("4");
        }

        else {
            if(b>0) System.out.print("2");
            else System.out.print("3");
        }
    }
}

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#2884 - 알람 시계

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.BufferedReader;
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 a = Integer.parseInt(st.nextToken());
        int b = Integer.parseInt(st.nextToken());
        
        if(b>=45) {
            System.out.print(a+" "+(b-45));
        }
        else {
            if(a==0) System.out.print("23 "+(60+b-45));
            else System.out.print((a-1)+" "+(60+b-45));
        }
    }
}

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#2525 - 오븐 시계

주의할 점은 B+C가 120분을 넘어갈 수 있다는 것! 나처럼 틀릴 수 있다! 

그래서 B+C를 60으로 나눈 몫을 plus 변수로 두고, 변화된 시, 분에 적용했다.

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.BufferedReader;
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 a = Integer.parseInt(st.nextToken());
        int b = Integer.parseInt(st.nextToken());

        int c = Integer.parseInt(br.readLine());

        if(b+c<60) {
            System.out.print(a+" "+(b+c));
        }
        else {
            int plus = (b+c)/60;
            if(a+plus>=24) System.out.print((a+plus-24)+" "+(b+c-60*plus));
            else System.out.print((a+plus)+" "+(b+c-60*plus));
        }
    }
}

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#2480 - 주사위 세개

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.BufferedReader;
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 a = Integer.parseInt(st.nextToken());
        int b = Integer.parseInt(st.nextToken());
        int c = Integer.parseInt(st.nextToken());

        int prize;
        
        if(a==b && b==c) prize = 10000 + a*1000;
        else if(a==b || a==c) prize = 1000 + a*100;
        else if(b==c) prize = 1000 + b*100;
        else{
            int max = a;
            if(b>max) max = b;
            if(c>max) max = c;
            prize = max*100;
        }
        
        System.out.print(prize);
    }
}