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Quick Sort 알고리즘 입니다.
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#include <stdio.h> | |
#include <stdbool.h> | |
#define MAX 9 | |
int intArray[MAX] = {15,25,45,65,22,33,9,7,55}; | |
void printline(int count) { | |
int i; | |
for(i = 0;i <count-1;i++) { | |
printf("="); | |
} | |
printf("=\n"); | |
} | |
void display() { | |
int i; | |
printf("["); | |
// navigate through all items | |
for(i = 0;i<MAX;i++) { | |
printf("%d ",intArray[i]); | |
} | |
printf("]\n"); | |
} | |
void swap(int num1, int num2) { | |
int temp = intArray[num1]; | |
intArray[num1] = intArray[num2]; | |
intArray[num2] = temp; | |
} | |
int partition(int left, int right, int pivot) { | |
int leftPointer = left -1; | |
int rightPointer = right; | |
while(true) { | |
while(intArray[++leftPointer] < pivot) { | |
//do nothing | |
} | |
while(rightPointer > 0 && intArray[--rightPointer] > pivot) { | |
//do nothing | |
} | |
if(leftPointer >= rightPointer) { | |
break; | |
} else { | |
printf(" item swapped :%d,%d\n", intArray[leftPointer],intArray[rightPointer]); | |
swap(leftPointer,rightPointer); | |
} | |
} | |
printf(" pivot swapped :%d,%d\n", intArray[leftPointer],intArray[right]); | |
swap(leftPointer,right); | |
printf("Updated Array: "); | |
display(); | |
return leftPointer; | |
} | |
void quickSort(int left, int right) { | |
if(right-left <= 0) { | |
return; | |
} else { | |
int pivot = intArray[right]; | |
int partitionPoint = partition(left, right, pivot); | |
quickSort(left,partitionPoint-1); | |
quickSort(partitionPoint+1,right); | |
} | |
} | |
main() { | |
printf("Input Array: "); | |
display(); | |
printline(50); | |
quickSort(0,MAX-1); | |
printf("Output Array: "); | |
display(); | |
printline(50); | |
} |
Author
cozyplanes
commented
Aug 19, 2017
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