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March 26, 2018 16:51
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quicksort with c language.
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#include <stdio.h> | |
#include <stdlib.h> | |
#define STRINGS_SIZE 32 | |
#define DATA_SIZE 10000000 | |
#define SWAP(a,b) {int temp; temp = a; a = b; b = temp;} | |
void quick_sort(int *, int); | |
void quick_sort_sub(int *, int, int); | |
void quick_sort(int *data, int data_size) | |
{ | |
quick_sort_sub(data, 0, data_size - 1); | |
} | |
void quick_sort_sub(int *data, int left, int right) | |
{ | |
int left_index = left; | |
int right_index = right; | |
int pivot = data[(left + right) / 2]; | |
while (left_index <= right_index) { | |
for ( ; data[left_index] < pivot; left_index++) | |
; | |
for ( ; data[right_index] > pivot; right_index--) | |
; | |
if (left_index <= right_index) { | |
SWAP(data[left_index], data[right_index]); | |
left_index++; | |
right_index--; | |
} | |
} | |
if (right_index > left) { | |
quick_sort_sub(data, left, right_index); | |
} | |
if (left_index < right) { | |
quick_sort_sub(data, left_index, right); | |
} | |
} | |
int main(int argc, char *argv[]) | |
{ | |
int i = 0; | |
int data[DATA_SIZE]; | |
char str[STRINGS_SIZE]; | |
FILE *fp; | |
if ((fp = fopen("print", "r")) == NULL) { | |
printf("file open error.\n"); | |
return 1; | |
} | |
while (fgets(str, STRINGS_SIZE, fp) != NULL) { | |
data[i] = atoi(str); | |
i++; | |
} | |
fclose(fp); | |
quick_sort(data, DATA_SIZE); | |
for (i = 0; i < DATA_SIZE; i++) { | |
printf("%d\n", data[i]); | |
} | |
return 0; | |
} |
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ruby -e"1.step(10000000, 1){|i| puts rand(10000000)}" > print |
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