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threeBuckets.c
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threeBuckets.c
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#include <stdio.h>
void threeBuckets(int *array, int length, int low, int high);
void swap(int *arra, int a, int b);
void printArray(int *array, int length);
int main(void) {
int array[10] = {1, 7, 2, 5};
int length = 4;
int lowPivotValue = 3;
int highPivotValue = 7;
printArray(array, length);
threeBuckets(array, length, lowPivotValue, highPivotValue);
printArray(array, length);
return 1;
}
void threeBuckets(int *array, int length, int low, int high) {
int i = 0;
int lowIndex = 0; // initial low pivot index
int highIndex = length-1; // initial high pivot index
int temp = 0;
for(i = 0; i < length; i++) {
// when two pivot indices met
if (lowIndex == highIndex) {
break;
}
if (low < array[i]) {
// swap(array, lowIndex+1, i);
printf("low swap: ");
printArray(array, length);
temp = array[lowIndex+1];
array[lowIndex+1] = array[i];
array[i] = temp;
printf("low swap: ");
printArray(array, length);
lowIndex++;
}
if (array[i] < high) {
// swap(array, highIndex-1, i);
printf("high swap: ");
printArray(array, length);
temp = array[highIndex-1];
array[highIndex-1] = array[i];
array[i] = temp;
printf("high swap: ");
printArray(array, length);
highIndex--;
}
}
}
void swap(int *array, int a, int b) {
int temp = *(array + a);
*(array + a) = *(array + b);
*(array + b) = temp;
}
void printArray(int *array, int length) {
int i = 0;
for (i = 0; i < length; i++) {
printf("%d ", array[i]);
}
printf("\n");
}