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week8 format

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黑墨水鱼
2021-04-29 15:24:27 +08:00
parent 5fb1ec5cef
commit 968416e919
2 changed files with 33 additions and 37 deletions
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46
week8/quicksort.c
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@@ -30,7 +30,7 @@ int main() {
end = clock(); end = clock();
_PrintClockInterval(start, end); _PrintClockInterval(start, end);
if(Check(A1, size_1)){ if (Check(A1, size_1)) {
printf("Checking result... pass\n"); printf("Checking result... pass\n");
} else { } else {
printf("Checking result... fail\n"); printf("Checking result... fail\n");
@@ -58,7 +58,7 @@ int main() {
end = clock(); end = clock();
PrintClockInterval(start, end); PrintClockInterval(start, end);
if(Check(A2, size_2)){ if (Check(A2, size_2)) {
printf("Checking result... pass\n"); printf("Checking result... pass\n");
} else { } else {
printf("Checking result... fail\n"); printf("Checking result... fail\n");
@@ -73,13 +73,13 @@ int main() {
void QuickSort(int *A, int left, int right) { void QuickSort(int *A, int left, int right) {
int q; int q;
if (left >= right){ if (left >= right) {
return; return;
} }
/* q is the position of the pivot */ /* q is the position of the pivot */
q = Partition(A, left, right); q = Partition(A, left, right);
QuickSort(A, left, q-1); QuickSort(A, left, q - 1);
QuickSort(A, q+1, right); QuickSort(A, q + 1, right);
} }
int Partition(int *A, int left, int right) { int Partition(int *A, int left, int right) {
@@ -89,13 +89,13 @@ int Partition(int *A, int left, int right) {
/* use i, j, pivot to locate left, right, and pivot */ /* use i, j, pivot to locate left, right, and pivot */
int i, j, pivot; int i, j, pivot;
Swap(A, p, right); Swap(A, p, right);
i = left, j = right-1, pivot = A[right]; i = left, j = right - 1, pivot = A[right];
while(true){ while (true) {
while (i<right && A[i]<pivot) while (i < right && A[i] < pivot)
i++; i++;
while (j>=left && A[j]>pivot) while (j >= left && A[j] > pivot)
j--; j--;
if (i<j) if (i < j)
Swap(A, i++, j--); Swap(A, i++, j--);
else else
break; break;
@@ -106,29 +106,29 @@ int Partition(int *A, int left, int right) {
int Pivot(int *A, int left, int right) { int Pivot(int *A, int left, int right) {
int middle = 0; int middle = 0;
middle = (left + right)/2; middle = (left + right) / 2;
if(A[left]>A[middle]){ if (A[left] > A[middle]) {
if(A[middle]>A[right]){ if (A[middle] > A[right]) {
middle = middle; middle = middle;
}else if(A[right]>A[left]) { } else if (A[right] > A[left]) {
middle = left; middle = left;
}else{ } else {
middle = right; middle = right;
} }
}else{ } else {
if(A[middle]<A[right]){ if (A[middle] < A[right]) {
middle = middle; middle = middle;
}else if(A[right]<A[left]){ } else if (A[right] < A[left]) {
middle = left; middle = left;
}else{ } else {
middle = right; middle = right;
} }
} }
return middle; return middle;
} }
void Swap(int *A, int x,int y) { void Swap(int *A, int x, int y) {
int tmp; int tmp;
tmp = A[x]; tmp = A[x];
A[x] = A[y]; A[x] = A[y];
@@ -151,13 +151,11 @@ bool Check(int *A, int size) {
} }
void PrintClockInterval(clock_t start, clock_t end) { void PrintClockInterval(clock_t start, clock_t end) {
printf("the time cost of this algorithms is %ld ms\n", (end - start) / (CLOCKS_PER_SEC / 1000)); printf("the time cost of this algorithms is %ld ms\n",
(end - start) / (CLOCKS_PER_SEC / 1000));
} }
/* use this to check small size of data */ /* use this to check small size of data */
void _PrintClockInterval(clock_t start, clock_t end) { void _PrintClockInterval(clock_t start, clock_t end) {
printf("the time cost of this algorithms is %ld ms\n", (end - start)); printf("the time cost of this algorithms is %ld ms\n", (end - start));
} }

8
week8/quicksort.h
View File

@@ -1,9 +1,8 @@
#include <stdbool.h> #include <stdbool.h>
#include <time.h> #include <time.h>
/* Sort array A[left..right] using quick sort
/* Sort array A[left..right] using quick sort */ * Pivot is picked using median-of-3 */
/* Pivot is picked using median-of-3 */
void QuickSort(int *A, int left, int right); void QuickSort(int *A, int left, int right);
/* Sort the array in order */ /* Sort the array in order */
@@ -13,7 +12,7 @@ int Partition(int *A, int left, int right);
int Pivot(int *A, int left, int right); int Pivot(int *A, int left, int right);
/* Swap A[x], A[y] */ /* Swap A[x], A[y] */
void Swap(int *A, int x,int y); void Swap(int *A, int x, int y);
/* create check functions */ /* create check functions */
bool Check(int *A, int size); bool Check(int *A, int size);
@@ -23,4 +22,3 @@ void PrintClockInterval(clock_t start, clock_t end);
/* use this to check small size of data */ /* use this to check small size of data */
void _PrintClockInterval(clock_t start, clock_t end); void _PrintClockInterval(clock_t start, clock_t end);