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add heapsort

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koseokkyu 2017-11-12 02:55:38 +09:00
parent 03a0e01950
commit 19a2def4a9
1 changed files with 67 additions and 0 deletions
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Sorts/HeapSort.c Normal file
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#include <stdio.h>
void heapify(int *unsorted, int index, int heap_size);
void heap_sort(int *unsorted, int n);
int main() {
int n = 0;
int i = 0;
char s[50];
char oper;
int* unsorted;
printf("Enter the size of the array you want\n");
scanf("%d", &n);
unsorted = (int*)malloc(sizeof(int) * n);
while (getchar() != '\n');
printf("Enter numbers separated by a comma:\n");
gets(s);
char *ptr = strtok(s, ",");
while (ptr != NULL && i < n) {
*(unsorted + i) = atoi(ptr);
i++;
ptr = strtok(NULL, ",");
}
heap_sort(unsorted, n);
printf("[");
printf("%d", *(unsorted));
for (int i = 1; i < n; i++) {
printf(", %d", *(unsorted + i));
}
printf("]");
}
void heapify(int *unsorted, int index, int heap_size) {
int temp;
int largest = index;
int left_index = 2 * index;
int right_index = 2 * index + 1;
if (left_index < heap_size && *(unsorted + left_index) > *(unsorted + largest)) {
largest = left_index;
}
if (right_index < heap_size && *(unsorted + right_index) > *(unsorted + largest)) {
largest = right_index;
}
if (largest != index) {
temp = *(unsorted + largest);
*(unsorted + largest) = *(unsorted + index);
*(unsorted + index) = temp;
heapify(unsorted, largest, heap_size);
}
}
void heap_sort(int *unsorted, int n) {
int temp;
for (int i = n / 2 - 1; i > -1; i--) {
heapify(unsorted, i, n);
}
for (int i = n - 1; i > 0; i--) {
temp = *(unsorted);
*(unsorted) = *(unsorted + i);
*(unsorted + i) = temp;
heapify(unsorted, 0, i);
}
}