Deep introduction to the sort algorithm-hill sort

Source: Internet
Author: User

# Include <stdio. h>

/* Sort by hill

Basic Idea: Hill sorting, also known as downgrading incremental sorting, optimizes simple insertion sorting. (External group gap, sorting of group insertion !!)

Features: an unstable sorting

*/

Void shellsort (INT array [], int Len ){

Int I, J;

Int gap; // gap

Int temp;

For (Gap = Len/2; Gap> 0; Gap = gap/2) {// The core is to compare array [J + Gap] With array [J] Until Gap = 1

For (I = gap; I <Len; I ++) {// I: Gap ~ <Len (I ++) 4, 3, 2, 1...

Temp = array [I];

For (j = I-gap; j> = 0; j-= gap) {// J: I-gap ~ > = 0 (j = J-gap)

If (temp <array [J]) {

Array [J + Gap] = array [J]; // If the element to be inserted <the previous sequence, the elements are removed.

}

Else

Break;

}

Array [J + Gap] = temp; // fill in the elements to be inserted.

}

}

}

Int main (INT argc, const char * argv [])

{

Int I = 0;

Int A [] = };

Int Len = sizeof (a)/sizeof (A [0]);

// Sort by hill

Shellsort (A, Len );

For (I = 0; I <Len; I ++ ){

Printf ("% d", a [I]);

}

Printf ("\ n ");

Return0;

}

Deep introduction to the sort algorithm-hill sort

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