[백준/JAVA] 단계별로 풀어보기(4단계) 코드 모음

문제 10818) 최소, 최대

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 N = Integer.parseInt(br.readLine());
        StringTokenizer st = new StringTokenizer(br.readLine());
        int min = 1000000;
        int max = -1000000;
        int num;
        for(int i=0;i<N;i++) {
            num = Integer.parseInt(st.nextToken());
            if(min> num)
                min = num;
            if(max<num)
                max = num;
        }
        System.out.println(min + " " + max);
    }
}

문제 2562) 최댓값

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 max =0;
        int i = 1;
        int num;
        for(int j=1;j<=9;j++) {
            num = Integer.parseInt(br.readLine());
            if(max<num) {
                max = num;
                i = j;
            }
        }
        StringBuilder sb = new StringBuilder();
        sb.append(max).append("\n").append(i).append("\n");
        System.out.print(sb);
    }
} 

문제 2577) 숫자의 개수

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 A = Integer.parseInt(br.readLine());
        int B = Integer.parseInt(br.readLine());
        int C = Integer.parseInt(br.readLine());
        int word[] = new int[10];
        String num = Integer.toString(A*B*C);
        for(int i=0;i<num.length();i++) {
            word[((int)num.charAt(i)-'0')]++;
        }
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<word.length;i++) {
            sb.append(word[i]).append("\n");
        }
        System.out.print(sb);
    }
}

문제 3052) 나머지

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 result[] = new int[42];
        int num;
        int count = 0;
        for(int i=0;i<10;i++) {
            num = Integer.parseInt(br.readLine())%42;
            result[num]++;
            if(result[num]==1)
                count++;
        }
        System.out.println(count);
    }
}

문제 1546) 평균

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 N = Integer.parseInt(br.readLine());
        int arr[] = new int[N];
        StringTokenizer st = new StringTokenizer(br.readLine());
        int M = 0;
        double result =0;
        for(int i=0;i<arr.length;i++) {
            arr[i] = Integer.parseInt(st.nextToken());
            if(M < arr[i]) {
                M = arr[i];
            }
        }
        for(int i=0;i<arr.length;i++) {
            result += (double)arr[i]/M*100;
        }
        result/=arr.length;
        System.out.println(result);
    }
}

문제 8958) OX퀴즈

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 T = Integer.parseInt(br.readLine());
        String input;
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<T;i++) {
            int score = 1;
            int result = 0;
            input = br.readLine();
            for(int j=0;j<input.length();j++) {
                if(input.charAt(j)=='O') {
                    result+=score;
                    score++;
                }
                else {
                    score=1;
                }
            }
            sb.append(result).append("\n");
        }
        System.out.print(sb);
    }
}

문제 4344) 평균은 넘겠지

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 C = Integer.parseInt(br.readLine());
        int N;
        StringTokenizer st;
        StringBuilder sb = new StringBuilder();
        int student[];
        for(int i=0;i<C;i++) {
            st = new StringTokenizer(br.readLine());
            N = Integer.parseInt(st.nextToken());
            student = new int[N];
            double average = 0;
            int score;
            int t =0;
            for(int j=0;j<N;j++) {
                score = Integer.parseInt(st.nextToken());
                average+=score;
                student[j]=score;
            }
            average/=N;
            for(int j =0;j<N;j++) {
                if(student[j]>average) {
                    t++;
                }
            }
            sb.append(String.format("%.3f", Math.round((double)t/N*1000*100)/(double)1000)).append("%\n");
        }
        System.out.print(sb);
    }
}