50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
#include <stdio.h>
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void swap(int* data, unsigned int i, unsigned int j) {
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int tmp = data[i];
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data[i] = data[j];
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data[j] = tmp;
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}
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void siftdown(int* data, unsigned int n, unsigned int i) {
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unsigned int left, right, ip;
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while( i < n ) {
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left = 2 * i + 1;
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right = 2 * i + 2;
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if( !(left < n) ) break;
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ip = left;
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if( right < n && data[ip] < data[right] ) ip = right;
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if( data[ip] < data[i] ) break;
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swap(data,i,ip);
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i = ip;
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}
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}
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void heapcreate(int* data, unsigned int n) {
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for(unsigned int i = n/2; i > 0; i--) {
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siftdown(data, n, i);
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}
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siftdown(data, n, 0);
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}
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void heapsort(int* data, unsigned int n) {
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heapcreate(data, n);
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for(unsigned int heapsize = n-1; heapsize > 0; heapsize--) {
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swap(data,0,heapsize);
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siftdown(data,heapsize,0);
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}
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}
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int main( int argc, char *argv[] ) {
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int data[10] = { 3,7,5,1,2,8,9,0,4,6 };
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heapsort(data, 10);
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for(unsigned int i = 0; i < 10; i++) printf("%d ", data[i]);
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printf("\n");
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return 0;
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}
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