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sort/bigInteger
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package bigInteger; | ||
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import java.io.BufferedReader; | ||
import java.io.IOException; | ||
import java.io.InputStreamReader; | ||
import java.math.BigInteger; | ||
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/* | ||
* 작성일 : 2018년 07월 15일 | ||
* 내 용 : 큰 수 A+B | ||
* A+B를 계산하시오. | ||
*/ | ||
public class Code_10757 { | ||
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public static void main(String[] args) throws IOException { | ||
// TODO Auto-generated method stub | ||
BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | ||
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String[] arr=br.readLine().split(" "); | ||
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BigInteger a = new BigInteger(arr[0]); | ||
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BigInteger b = new BigInteger(arr[1]); | ||
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System.out.println(a.add(b)); | ||
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//Scanner를 이용하면 좀 더 편히 구현할 수 있다. | ||
// BigInteger a = sc.nextBigInteger(); 로 입력받는 순간 변수에 넣을 수 있음. | ||
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} | ||
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} |
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package bigInteger; | ||
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import java.io.BufferedReader; | ||
import java.io.IOException; | ||
import java.io.InputStreamReader; | ||
import java.math.BigInteger; | ||
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/* | ||
* 작성일 : 2018년 07월 15일 | ||
* 내 용 : 피보나치 수 4 | ||
* n이 주어졌을 때, n번째 피보나치 수를 구하는 프로그램을 작성하시오. | ||
* n은 10,000보다 작거나 같은 자연수 또는 0이다. | ||
*/ | ||
public class Code_10826 { | ||
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static BigInteger[] arr = new BigInteger[10000]; | ||
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public static void main(String[] args) throws NumberFormatException, IOException { | ||
// TODO Auto-generated method stub | ||
BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | ||
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int num = Integer.parseInt(br.readLine()); | ||
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System.out.println(pibonacci(num)); | ||
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} | ||
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static BigInteger pibonacci(int num) { | ||
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if(arr[num]!=null) return arr[num]; | ||
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else { | ||
System.out.println(num); | ||
BigInteger i = new BigInteger(String.valueOf(num)); | ||
if(i.equals(BigInteger.ZERO) || i.equals(BigInteger.ONE)) { | ||
return arr[num] = i; | ||
} | ||
else { | ||
BigInteger e = pibonacci(num-1).add(pibonacci(num-2)); | ||
return arr[num] = e; | ||
} | ||
} | ||
} | ||
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} |
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package bigInteger; | ||
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import java.math.BigDecimal; | ||
import java.util.Scanner; | ||
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/* | ||
* 작성일 : 2018년 07월 15일 | ||
* 내 용 : a^b | ||
* 실수 a와 정수 b가 주어졌을 때, a의 b제곱을 정확하게 계산하는 프로그램을 작성. | ||
*/ | ||
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public class Code_10827 { | ||
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public static void main(String[] args) { | ||
// TODO Auto-generated method stub | ||
Scanner input = new Scanner(System.in); | ||
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String[] arr = input.nextLine().split(" "); | ||
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BigDecimal a = new BigDecimal(arr[0]); | ||
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int b = Integer.parseInt(arr[1]); | ||
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BigDecimal c = a.pow(b); | ||
System.out.println(c.toPlainString()); | ||
//toPlainString() : BigDecimal를 표현할 때 과학적 표기를 사용하지 않음. | ||
//toString() : BigDecimal를 표현할 때 과학적 표기를 사용함. | ||
} | ||
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} |
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package sort; | ||
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import java.io.BufferedReader; | ||
import java.io.IOException; | ||
import java.io.InputStreamReader; | ||
import java.util.ArrayList; | ||
import java.util.Collections; | ||
import java.util.Comparator; | ||
import java.util.List; | ||
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/* | ||
* 작성일 : 2018년 07월 15일 | ||
* 내 용 : 백준11650 -2차원 평면 위의 점 N개가 주어진다. | ||
* 좌표를 x좌표가 증가하는 순으로, x좌표가 같으면 y좌표가 증가하는 순서로 | ||
* 정렬한 다음 출력하는 프로그램을 작성하시오. | ||
*/ | ||
public class Code_11650_Comparable { | ||
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public static void main(String[] args) throws IOException { | ||
// TODO Auto-generated method stub | ||
BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | ||
List<Point> list = new ArrayList<Point>(); | ||
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String [] arr = new String[2]; | ||
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int num = Integer.parseInt(br.readLine()); | ||
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for(int i=0; i<num; ++i) { | ||
arr = br.readLine().split(" "); | ||
Point p = new Point(Integer.parseInt(arr[0]),Integer.parseInt(arr[1])); | ||
list.add(p); | ||
} | ||
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Collections.sort(list); | ||
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/** | ||
34줄과 같은 결과 | ||
Collections.sort(list, new Comparator<Point>() { | ||
@Override | ||
public int compare(Point p1, Point p2) { | ||
return p1.compareTo(p2); | ||
} | ||
}); | ||
**/ | ||
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for(Point p : list) | ||
System.out.println(p.toString()); | ||
} | ||
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} | ||
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class Point implements Comparable<Point>{ | ||
int x; | ||
int y; | ||
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public Point(int x, int y) { | ||
this.x = x; | ||
this.y = y; | ||
} | ||
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public int getX() { | ||
return x; | ||
} | ||
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public void setX(int x) { | ||
this.x = x; | ||
} | ||
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public int getY() { | ||
return y; | ||
} | ||
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public void setY(int y) { | ||
this.y = y; | ||
} | ||
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@Override | ||
public String toString() { | ||
return x + " " + y ; | ||
} | ||
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@Override | ||
public int compareTo(Point p) { | ||
int r = this.x - p.x; | ||
if(r!=0) return r; | ||
else return this.y - p.y; | ||
} | ||
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} | ||
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package test; | ||
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import java.io.BufferedReader; | ||
import java.io.IOException; | ||
import java.io.InputStreamReader; | ||
import java.util.ArrayList; | ||
import java.util.Collections; | ||
import java.util.Comparator; | ||
import java.util.List; | ||
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/* | ||
* 작성일 : 2018년 07월 15일 | ||
* 내 용 : 백준11650 -2차원 평면 위의 점 N개가 주어진다. | ||
* 좌표를 x좌표가 증가하는 순으로, x좌표가 같으면 y좌표가 증가하는 순서로 | ||
* 정렬한 다음 출력하는 프로그램을 작성하시오. | ||
*/ | ||
public class Code_11650_Comparator { | ||
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public static void main(String[] args) throws IOException { | ||
// TODO Auto-generated method stub | ||
BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | ||
List<Point> list = new ArrayList<Point>(); | ||
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String [] arr = new String[2]; | ||
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int num = Integer.parseInt(br.readLine()); | ||
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for(int i=0; i<num; ++i) { | ||
arr = br.readLine().split(" "); | ||
Point p = new Point(Integer.parseInt(arr[0]),Integer.parseInt(arr[1])); | ||
list.add(p); | ||
} | ||
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Collections.sort(list, new PointComparator()); | ||
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for(Point p : list) | ||
System.out.println(p.toString()); | ||
} | ||
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} | ||
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class Point{ | ||
int x; | ||
int y; | ||
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public Point(int x, int y) { | ||
this.x = x; | ||
this.y = y; | ||
} | ||
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public int getX() { | ||
return x; | ||
} | ||
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public void setX(int x) { | ||
this.x = x; | ||
} | ||
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public int getY() { | ||
return y; | ||
} | ||
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public void setY(int y) { | ||
this.y = y; | ||
} | ||
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@Override | ||
public String toString() { | ||
return x + " " + y ; | ||
} | ||
} | ||
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class PointComparator implements Comparator<Point>{ | ||
@Override | ||
public int compare(Point p1, Point p2) { | ||
int r = p1.x - p2.x; | ||
if(r!=0) return r; | ||
else return p1.y-p2.y; | ||
} | ||
} |
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