"병합정렬 구현"의 두 판 사이의 차이

잔글 (봇: 자동으로 텍스트 교체 (-source +syntaxhighlight))
 
(사용자 4명의 중간 판 33개는 보이지 않습니다)
1번째 줄: 1번째 줄:
[[분류: 정렬]]
[[분류: 병합정렬]]
==C==
==C==
[[분류: C]]
[[분류: C]]
{{참고|C 병합정렬 구현}}
{{참고|C 병합정렬 구현}}
<source lang='c'>
<syntaxhighlight lang='c'>
#include <stdio.h>
#include <stdio.h>
void merge(int arr[], int left, int middle, int right) {
void merge_sort(int a[], int left, int right) {
     int temp[right-1], i, j, k;
    if( left>=right ) return;
for(i=left, j=left, k=middle+1; j<=middle && k<=right; i++) {
     int middle = (left+right-1)/2;
if(arr[j]<=arr[k]) temp[i]=arr[j++];
    merge_sort(a, left, middle);
else temp[i]=arr[k++];
    merge_sort(a, middle+1, right);
}
    int n1 = middle + 1 - left;
while(j <= middle) temp[i++]=arr[j++];
    int n2 = right - middle;
while(k <= right) temp[i++]=arr[k++];
    int i, j, k, L[n1], R[n2];
for(i=left; i<=right; i++) arr[i]=temp[i];  
    for(i=0; i<n1; i++) L[i]=a[left+i];
    for(i=0; i<n2; i++) R[i]=a[middle+1+i];
    i=j=0; k=left;
    while( i<n1 && j<n2 ) {
        if( L[i]<=R[j] ) { a[k]=L[i]; i++; k++; }
        else { a[k]=R[j]; j++; k++; }
    }
    while( i<n1 ) { a[k]=L[i]; i++; k++; }
    while( j<n2 ) { a[k]=R[j]; j++; k++; }
}
}
void merge_sort(int arr[], int left, int right) {
int main() {
if(left >= right) return;
    int arr[] = {9,1,22,4,0,-1,1,22,100,100};
int middle = (left+right)/2;
    int size = sizeof(arr)/sizeof(int);
merge_sort(arr, left, middle);
    merge_sort(arr, 0, size-1);
merge_sort(arr, middle+1, right);
    for(int i=0; i<size; i++) printf("%d ", arr[i]);
merge(arr, left, middle, right);
    // -1 0 1 1 4 9 22 22 100 100
}
</syntaxhighlight>
 
==C++==
[[분류: C++]]
{{참고|C++ 병합정렬 구현}}
<syntaxhighlight lang='cpp'>
#include <iostream>
void merge_sort(int a[], int left, int right) {
    if( left>=right ) return;
    int middle = (left+right-1)/2;
    merge_sort(a, left, middle);
    merge_sort(a, middle+1, right);
    int n1 = middle + 1 - left;
    int n2 = right - middle;
    int i, j, k, L[n1], R[n2];
    for(i=0; i<n1; i++) L[i]=a[left+i];
    for(i=0; i<n2; i++) R[i]=a[middle+1+i];
    i=j=0; k=left;
    while( i<n1 && j<n2 ) {
        if( L[i]<=R[j] ) { a[k]=L[i]; i++; k++; }
        else { a[k]=R[j]; j++; k++; }
    }
    while( i<n1 ) { a[k]=L[i]; i++; k++; }
    while( j<n2 ) { a[k]=R[j]; j++; k++; }
}
}
int main() {
int main() {
     int arr[] = {3,4,2,1,7,5,8,9,0,6,100,10};
     int arr[] = {9,1,22,4,0,-1,1,22,100,10};
     int size = sizeof(arr)/sizeof(int);
     int size = sizeof(arr)/sizeof(int);
merge_sort(arr, 0, size-1);
    merge_sort(arr, 0, size-1);
for(int i=0; i<size; i++) printf("%d ", arr[i]);
    for(int x: arr) std::cout << x << " ";
// 0 1 2 3 4 5 6 7 8 9 10 100
    // -1 0 1 1 4 9 10 22 22 100
}
</syntaxhighlight>
 
==C#==
[[분류: csharp]]
{{참고|C샵 병합정렬 구현}}
<syntaxhighlight lang='csharp'>
using System;
class Program {
    static void merge_sort(int[] a) {
        merge_sort(a,0,a.Length-1);
    }
    static void merge_sort(int[] a, int left, int right) {
        if( left>=right ) return;
        int middle = (left+right-1)/2;
        merge_sort(a, left, middle);
        merge_sort(a, middle+1, right);
        int n1 = middle + 1 - left;
        int n2 = right - middle;
        int[] L=new int[n1], R=new int[n2];
        int i, j, k;
        for(i=0; i<n1; i++) L[i]=a[left+i];
        for(i=0; i<n2; i++) R[i]=a[middle+1+i];
        i=j=0; k=left;
        while( i<n1 && j<n2 ) {
            if( L[i]<=R[j] ) { a[k]=L[i]; i++; k++; }
            else { a[k]=R[j]; j++; k++; }
        }
        while( i<n1 ) { a[k]=L[i]; i++; k++; }
        while( j<n2 ) { a[k]=R[j]; j++; k++; }
    }
    static void Main() {
        int[] arr = {9,1,22,4,0,-1,1,22,100,10};
        merge_sort(arr);
        Console.Write(string.Join(",",arr));
        // -1,0,1,1,4,9,10,22,22,100
    }
}
}
</source>
</syntaxhighlight>


==Java==
==Java==
[[분류: Java]]
[[분류: Java]]
{{참고|Java 병합정렬 구현}}
{{참고|Java 병합정렬 구현}}
<source lang='Java'>
<syntaxhighlight lang='Java'>
</source>
public class MyClass {
    static void merge(int[] arr, int left, int middle, int right) {
        int n1 = middle - left + 1;
        int n2 = right - middle;
        int L[] = new int[n1];
        int R[] = new int[n2];
        int i, j, k;
        for(i=0; i<n1; ++i) L[i]=arr[left+i];
        for(j=0; j<n2; ++j) R[j]=arr[middle+j+1];
        i=0; j=0; k=left;
        while( i<n1 && j<n2) {
            if(L[i] <= R[j]) { arr[k] = L[i]; i++; }
            else { arr[k] = R[j]; j++; }
            k++;
        }
        while( i < n1 ) { arr[k] = L[i]; i++; k++; }
        while( j < n2 ) { arr[k] = R[j]; j++; k++; }
    }
    static void merge_sort(int arr[], int left, int right) {
        if(left >= right) return;
        int middle = (left+right)/2;
        merge_sort(arr, left, middle);
        merge_sort(arr , middle+1, right);
        merge(arr, left, middle, right);
    }
    public static void main(String args[]) {
        int[] arr = {9,1,22,4,0,-1,1,22,100,10};
        merge_sort(arr, 0, arr.length-1);
        for(int x: arr) System.out.format("%d ",x);
        // -1 0 1 1 4 9 10 22 22 100
    }
}
</syntaxhighlight>
 
==Perl==
[[분류:Perl]]
{{참고|Perl 병합정렬 구현}}
<syntaxhighlight lang='perl'>
sub merge_sort {
    my ($a) = @_;
    $size = @$a;
    return if $size < 2;
    $bound = int $size/2;
    my @L = @$a[0 .. $bound-1];
    my @R = @$a[$bound .. $size-1];
    merge_sort( \@L );
    merge_sort( \@R );
    for $i (@$a) {
        $i = !@R ? shift @L : !@L ? shift @R
            : @R[0]<@L[0] ? shift @R : shift @L;
    }
}
@arr = (9,1,22,4,0,-1,1,22,100,10);
merge_sort( \@arr );
print join(',',@arr);
# -1,0,1,1,4,9,10,22,22,100
</syntaxhighlight>
 
==PHP==
[[분류: PHP]]
{{참고|PHP 병합정렬 구현}}
<syntaxhighlight lang='php'>
<?php
function merge_sort(&$a) {
    $size = count($a);
    if( $size<2 ) return;
    $bound = intdiv($size,2);
    $L = array_slice($a, 0, $bound);
    $R = array_slice($a, $bound, $size);
    merge_sort( $L );
    merge_sort( $R );
    foreach( $a as &$x ) {
        if(empty($R)) { $x=array_shift($L); continue; }
        if(empty($L)) { $x=array_shift($R); continue; }
        $x = ($R[0]<$L[0])? array_shift($R): array_shift($L);
    }
}
$arr = [9,1,22,4,0,-1,1,22,100,10];
merge_sort( $arr );
echo implode(',',$arr);
# -1,0,1,1,4,9,10,22,22,100
</syntaxhighlight>


==Python==
==Python==
[[분류: Python]]
[[분류: Python]]
{{참고|Python 병합정렬 구현}}
{{참고|Python 병합정렬 구현}}
<source lang='Python'>
<syntaxhighlight lang='Python'>
def merge(arr, left, middle, right):
def merge_sort(a, left=0, right=-1):
n1 = middle - left + 1
    def merge(a, left, middle, right):
n2 = right - middle
    n1 = middle + 1 - left  
L = [0] * (n1)
    n2 = right - middle
R = [0] * (n2)
    L = [0] * (n1)
for i in range(0 , n1):
    R = [0] * (n2)
L[i] = arr[left + i]
    for i in range(0, n1): L[i]=a[left+i]
for j in range(0 , n2):
    for j in range(0, n2): R[j]=a[middle+1+j]
R[j] = arr[middle + 1 + j]
    i = j = 0
i = j = 0
    k = left
k = left
    while i<n1 and j<n2:
while i < n1 and j < n2 :
    if L[i]<=R[j]: a[k]=L[i]; i+=1; k+=1
if L[i] <= R[j]:
    else: a[k]=R[j]; j+=1; k+=1
arr[k] = L[i]
    while i<n1: a[k]=L[i]; i+=1; k+=1
i += 1
    while j<n2: a[k]=R[j]; j+=1; k+=1
else:
    if right==-1: right=len(a)-1
arr[k] = R[j]
    if left>=right: return
j += 1
    middle = (left+right-1)//2
k += 1
    merge_sort(a, left, middle)
while i < n1:
    merge_sort(a, middle+1, right)
arr[k] = L[i]
    merge(a, left, middle, right)
i += 1
arr = [9,1,22,4,0,-1,1,22,100,10]
k += 1
merge_sort(arr)
while j < n2:
arr[k] = R[j]
j += 1
k += 1
def merge_sort(arr, left, right):
if left < right:
middle = int((left+(right-1))/2)
merge_sort(arr, left, middle)
merge_sort(arr, middle+1, right)
merge(arr, left, middle, right)
arr = [3,4,2,1,7,5,8,9,0,6,100,10]
merge_sort(arr, 0, len(arr)-1)
print( arr )
print( arr )
# [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100]
# [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100]
</source>
</syntaxhighlight>
 
==Ruby==
[[분류: Ruby]]
{{참고|Ruby 병합정렬 구현}}
<syntaxhighlight lang='ruby'>
def merge_sort(a, left=0, right=-1)
    def merge(a, left, middle, right)
        n1 = middle+1-left
        n2 = right-middle
        l = Array.new(n1,0)
        r = Array.new(n2,0)
        for i in (0...n1); l[i]=a[left+i]; end
        for i in (0...n2); r[i]=a[middle+1+i]; end
        i=j=0; k=left
        while i<n1 and j<n2
            if l[i]<=r[j] then a[k]=l[i]; i+=1; k+=1
            else a[k]=r[j]; j+=1; k+=1 end
        end
        while i<n1; a[k]=l[i]; i+=1; k+=1; end
        while j<n2; a[k]=r[j]; j+=1; k+=1; end
    end
    right=a.size-1 if right==-1
    return if left>=right
    middle = (left+right-1)/2
    merge_sort(a, left, middle)
    merge_sort(a, middle+1, right)
    merge(a, left, middle, right)
end
arr = [9,1,22,4,0,-1,1,22,100,10]
merge_sort(arr)
print arr
# [-1, 0, 1, 1, 4, 9, 10, 22, 22, 100]
</syntaxhighlight>


==같이 보기==
==같이 보기==
* [[병합정렬]]
* [[정렬 구현]]
* [[정렬 구현]]
* [[병합정렬]]
 
==참고==
* https://www.geeksforgeeks.org/merge-sort/
* https://www.interviewbit.com/tutorial/merge-sort-algorithm/

2020년 11월 2일 (월) 02:31 기준 최신판

1 C[ | ]

#include <stdio.h>
void merge_sort(int a[], int left, int right) {
    if( left>=right ) return;
    int middle = (left+right-1)/2;
    merge_sort(a, left, middle);
    merge_sort(a, middle+1, right);
    int n1 = middle + 1 - left;
    int n2 = right - middle;
    int i, j, k, L[n1], R[n2];
    for(i=0; i<n1; i++) L[i]=a[left+i];
    for(i=0; i<n2; i++) R[i]=a[middle+1+i];
    i=j=0; k=left;
    while( i<n1 && j<n2 ) {
        if( L[i]<=R[j] ) { a[k]=L[i]; i++; k++; }
        else { a[k]=R[j]; j++; k++; }
    }
    while( i<n1 ) { a[k]=L[i]; i++; k++; }
    while( j<n2 ) { a[k]=R[j]; j++; k++; }
}
int main() {
    int arr[] = {9,1,22,4,0,-1,1,22,100,100};
    int size = sizeof(arr)/sizeof(int);
    merge_sort(arr, 0, size-1);
    for(int i=0; i<size; i++) printf("%d ", arr[i]);
    // -1 0 1 1 4 9 22 22 100 100 
}

2 C++[ | ]

#include <iostream>
void merge_sort(int a[], int left, int right) {
    if( left>=right ) return;
    int middle = (left+right-1)/2;
    merge_sort(a, left, middle);
    merge_sort(a, middle+1, right);
    int n1 = middle + 1 - left;
    int n2 = right - middle;
    int i, j, k, L[n1], R[n2];
    for(i=0; i<n1; i++) L[i]=a[left+i];
    for(i=0; i<n2; i++) R[i]=a[middle+1+i];
    i=j=0; k=left;
    while( i<n1 && j<n2 ) {
        if( L[i]<=R[j] ) { a[k]=L[i]; i++; k++; }
        else { a[k]=R[j]; j++; k++; }
    }
    while( i<n1 ) { a[k]=L[i]; i++; k++; }
    while( j<n2 ) { a[k]=R[j]; j++; k++; }
}
int main() {
    int arr[] = {9,1,22,4,0,-1,1,22,100,10};
    int size = sizeof(arr)/sizeof(int);
    merge_sort(arr, 0, size-1);
    for(int x: arr) std::cout << x << " ";
    // -1 0 1 1 4 9 10 22 22 100 
}

3 C#[ | ]

using System;
class Program {
    static void merge_sort(int[] a) {
        merge_sort(a,0,a.Length-1);
    }
    static void merge_sort(int[] a, int left, int right) {
        if( left>=right ) return;
        int middle = (left+right-1)/2;
        merge_sort(a, left, middle);
        merge_sort(a, middle+1, right);
        int n1 = middle + 1 - left;
        int n2 = right - middle;
        int[] L=new int[n1], R=new int[n2];
        int i, j, k;
        for(i=0; i<n1; i++) L[i]=a[left+i];
        for(i=0; i<n2; i++) R[i]=a[middle+1+i];
        i=j=0; k=left;
        while( i<n1 && j<n2 ) {
            if( L[i]<=R[j] ) { a[k]=L[i]; i++; k++; }
            else { a[k]=R[j]; j++; k++; }
        }
        while( i<n1 ) { a[k]=L[i]; i++; k++; }
        while( j<n2 ) { a[k]=R[j]; j++; k++; }
    }
    static void Main() {
        int[] arr = {9,1,22,4,0,-1,1,22,100,10};
        merge_sort(arr);
        Console.Write(string.Join(",",arr));
        // -1,0,1,1,4,9,10,22,22,100
    }
}

4 Java[ | ]

public class MyClass {
    static void merge(int[] arr, int left, int middle, int right) {
        int n1 = middle - left + 1;
        int n2 = right - middle;
        int L[] = new int[n1];
        int R[] = new int[n2];
        int i, j, k;
        for(i=0; i<n1; ++i) L[i]=arr[left+i];
        for(j=0; j<n2; ++j) R[j]=arr[middle+j+1];
        i=0; j=0; k=left;
        while( i<n1 && j<n2) {
            if(L[i] <= R[j]) { arr[k] = L[i]; i++; }
            else { arr[k] = R[j]; j++; }
            k++;
        }
        while( i < n1 ) { arr[k] = L[i]; i++; k++; }
        while( j < n2 ) { arr[k] = R[j]; j++; k++; }
    }
    static void merge_sort(int arr[], int left, int right) {
        if(left >= right) return;
        int middle = (left+right)/2;
        merge_sort(arr, left, middle);
        merge_sort(arr , middle+1, right);
        merge(arr, left, middle, right);
    }
    public static void main(String args[]) {
        int[] arr = {9,1,22,4,0,-1,1,22,100,10};
        merge_sort(arr, 0, arr.length-1);
        for(int x: arr) System.out.format("%d ",x);
        // -1 0 1 1 4 9 10 22 22 100 
    }
}

5 Perl[ | ]

sub merge_sort {
    my ($a) = @_;
    $size = @$a;
    return if $size < 2;
    $bound = int $size/2;
    my @L = @$a[0 .. $bound-1];
    my @R = @$a[$bound .. $size-1];
    merge_sort( \@L );
    merge_sort( \@R );
    for $i (@$a) {
        $i = !@R ? shift @L : !@L ? shift @R
            : @R[0]<@L[0] ? shift @R : shift @L;
    }
}
@arr = (9,1,22,4,0,-1,1,22,100,10);
merge_sort( \@arr );
print join(',',@arr);
# -1,0,1,1,4,9,10,22,22,100

6 PHP[ | ]

<?php
function merge_sort(&$a) {
    $size = count($a);
    if( $size<2 ) return;
    $bound = intdiv($size,2);
    $L = array_slice($a, 0, $bound);
    $R = array_slice($a, $bound, $size);
    merge_sort( $L );
    merge_sort( $R );
    foreach( $a as &$x ) {
        if(empty($R)) { $x=array_shift($L); continue; }
        if(empty($L)) { $x=array_shift($R); continue; }
        $x = ($R[0]<$L[0])? array_shift($R): array_shift($L);
    }
}
$arr = [9,1,22,4,0,-1,1,22,100,10];
merge_sort( $arr );
echo implode(',',$arr);
# -1,0,1,1,4,9,10,22,22,100

7 Python[ | ]

def merge_sort(a, left=0, right=-1):
    def merge(a, left, middle, right):
    	n1 = middle + 1 - left 
    	n2 = right - middle
    	L = [0] * (n1)
    	R = [0] * (n2)
    	for i in range(0, n1): L[i]=a[left+i]
    	for j in range(0, n2): R[j]=a[middle+1+j]
    	i = j = 0
    	k = left
    	while i<n1 and j<n2:
    		if L[i]<=R[j]: a[k]=L[i]; i+=1; k+=1
    		else: a[k]=R[j]; j+=1; k+=1
    	while i<n1: a[k]=L[i]; i+=1; k+=1
    	while j<n2:	a[k]=R[j]; j+=1; k+=1
    if right==-1: right=len(a)-1
    if left>=right: return
    middle = (left+right-1)//2
    merge_sort(a, left, middle)
    merge_sort(a, middle+1, right)
    merge(a, left, middle, right)
arr = [9,1,22,4,0,-1,1,22,100,10]
merge_sort(arr)
print( arr )
# [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100]

8 Ruby[ | ]

def merge_sort(a, left=0, right=-1)
    def merge(a, left, middle, right)
        n1 = middle+1-left
        n2 = right-middle
        l = Array.new(n1,0)
        r = Array.new(n2,0)
        for i in (0...n1); l[i]=a[left+i]; end
        for i in (0...n2); r[i]=a[middle+1+i]; end
        i=j=0; k=left
        while i<n1 and j<n2
            if l[i]<=r[j] then a[k]=l[i]; i+=1; k+=1
            else a[k]=r[j]; j+=1; k+=1 end
        end
        while i<n1; a[k]=l[i]; i+=1; k+=1; end
        while j<n2; a[k]=r[j]; j+=1; k+=1; end
    end
    right=a.size-1 if right==-1
    return if left>=right
    middle = (left+right-1)/2
    merge_sort(a, left, middle)
    merge_sort(a, middle+1, right)
    merge(a, left, middle, right)
end
arr = [9,1,22,4,0,-1,1,22,100,10]
merge_sort(arr)
print arr
# [-1, 0, 1, 1, 4, 9, 10, 22, 22, 100]

9 같이 보기[ | ]

10 참고[ | ]

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