[JAVA] 백준 3단계

2739 구구단

나의 답) 108ms

import java.io.*;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        
        for (int i = 1; i <= 9; i++) {
            System.out.printf("%d * %d = %d\n", n, i, n * i);
        }
    }
}

 

다른 사람의 답) 100ms

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

---

10950 A  + B - 3

나의 답1) 104ms

import java.io.*;
import java.util.StringTokenizer;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int T = Integer.parseInt(br.readLine());
        
        for (int i = 0; i < T; i++) {
            StringTokenizer st = new StringTokenizer(br.readLine());
            int A = Integer.parseInt(st.nextToken());
            int B = Integer.parseInt(st.nextToken());
            System.out.println(A + B);
        }
    }
}

 

나의 답2) 96ms

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

---

8393 합

나의 답) 104ms

import java.io.*;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int sum = 0;
        
        int n = Integer.parseInt(br.readLine());
        for (int i = 1; i <= n; i++) {
            sum += i;
        }
        System.out.print(sum);
    }
}

 

 

다른 사람의 답) 108ms

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

---

25304 영수증

나의 답) 100ms

import java.io.*;
import java.util.StringTokenizer;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int X = Integer.parseInt(br.readLine());
        int N = Integer.parseInt(br.readLine());
        int amount = 0;
        
        StringTokenizer st;
        for(int i = 0; i < N; i++) {
            st = new StringTokenizer(br.readLine());
            amount += Integer.parseInt(st.nextToken()) * Integer.parseInt(st.nextToken());
        }
        
        String ans = X == amount ? "Yes" : "No";
        System.out.print(ans);
    }
}

---

25314 코딩은 체육과목입니다

나의 답) 104ms

import java.io.*;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        
        int N = Integer.parseInt(br.readLine());
        for (int i = 0; i < (N / 4); i++) {
            sb.append("long ");
        }
        sb.append("int");
        System.out.print(sb);
    }
}

 

다른 사람의 답) 100ms

import java.io.*;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        
        int N = Integer.parseInt(br.readLine());
        
        sb.append("long ".repeat(N / 4));
        sb.append("int");
        
        System.out.print(sb);
    }
}

---

15552 빠른 A + B

나의 답) 724ms

import java.io.*;
import java.util.StringTokenizer;
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));
        StringTokenizer st;
        
        int T = Integer.parseInt(br.readLine());
        
        for (int i = 0; i < T; i++) {
            st = new StringTokenizer(br.readLine());
            bw.write((Integer.parseInt(st.nextToken()) + Integer.parseInt(st.nextToken()) + "\n"));
        }
        bw.flush();
        bw.close();
    }
}

---

11021 A + B - 7

나의 코드1) 136ms

import java.io.*;
import java.util.StringTokenizer;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st;
        int T = Integer.parseInt(br.readLine());
        
        for (int i = 1; i <= T; i++) {
            st = new StringTokenizer(br.readLine());
            System.out.printf("Case #%d: %d\n", i, (Integer.parseInt(st.nextToken()) + Integer.parseInt(st.nextToken())));
        }
    }
}

 

나의 코드2) 100ms

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

---

11022 A + B - 8

나의 코드) 100ms

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

---

2438 별 찍기 - 1

나의 코드/틀린코드) 출력 초과

import java.io.*;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());

        for (int i = 0; i < N; i++) {
            for(int j = 0; j <= i; i++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

 

다른 사람의 코드1) 100ms

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

 

다른 사람의 코드2) 100ms

import java.io.*;
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 N = Integer.parseInt(br.readLine());
        
        for (int i = 0; i < N; i++) {
            for (int j = 0; j <= i; j++) {
                bw.write("*");
            }
            bw.write("\n");
        }
        bw.flush();
        bw.close();
    }
}

---

2439 별 찍기 - 2

나의 답) 108ms

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

 

다른 사람의 답1) 100ms

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

---

 

10952 A + B - 5

나의 답) 100ms

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

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

---

10951 A + B - 4

나의 답) 100ms

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

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 line;
        
        while ((line = br.readLine()) != null) {
            st = new StringTokenizer(line);
            int A = Integer.parseInt(st.nextToken());
            int B = Integer.parseInt(st.nextToken());
            
            sb.append(A + B).append("\n");
        }
        System.out.print(sb);
    }
}