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sort.cc
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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <time.h>
#include <algorithm>
#include <functional>
#include <iostream>
#include <cstdint>
#include <string>
#include "quicksort.h"
#include "dualpivotquick.h"
#include "sort.h"
#include "timsort.h"
#include "drand48.h"
#include "random.h"
#include "slice.h"
template<typename T> struct block {
typedef T value_type;
typedef T* iterator ;
typedef const T * const_iterator;
typedef T& reference;
typedef const T & const_reference;
typedef ptrdiff_t difference_type;
operator T*() {return data_; }
reference operator[](difference_type i) { return data_[i]; }
const_reference operator [](difference_type i) const { return data_[i]; }
iterator begin(){ return data_;}
const_iterator begin() const { return data_;}
iterator end(){ return data_+size_;}
const_iterator end() const { return data_+size_;}
ptrdiff_t size() const { return size_ ;}
block(T data[], size_t size){
data_ = data;
size_ = size;
}
private:
size_t size_;
T* data_;
};
using namespace std;
/**********************************
* BEGIN OF PAUL'S IMPLEMENTATION *
**********************************/
/* Attractive Chaos: I have added inline where necessary. */
/*
Copyright (c) 2004 Paul Hsieh
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
Neither the name of sorttest nor the names of its contributors may be
used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
/*
Recommended flags:
------------------
Intel C/C++:
icl /O2 /G6 /Qaxi /Qxi /Qip sorttest.c
WATCOM C/C++:
wcl386 /otexan /6r sorttest.c
GCC:
gcc -O3 -mcpu=athlon-xp -march=athlon-xp sorttest.c
MSVC:
cl /O2 /Ot /Og /G6 sorttest.c
*/
static inline void sort2 (int * numbers) {
int tmp;
if (numbers[0] <= numbers[1]) return;
tmp = numbers[0];
numbers[0] = numbers[1];
numbers[1] = tmp;
}
static inline void sort3 (int * numbers) {
int tmp;
if (numbers[0] <= numbers[1]) {
if (numbers[1] <= numbers[2]) return;
if (numbers[2] <= numbers[0]) {
tmp = numbers[0];
numbers[0] = numbers[2];
numbers[2] = numbers[1];
numbers[1] = tmp;
return;
}
tmp = numbers[1];
} else {
tmp = numbers[0];
if (numbers[0] <= numbers[2]) {
numbers[0] = numbers[1];
numbers[1] = tmp;
return;
}
if (numbers[2] <= numbers[1]) {
numbers[0] = numbers[2];
numbers[2] = tmp;
return;
}
numbers[0] = numbers[1];
}
numbers[1] = numbers[2];
numbers[2] = tmp;
}
static inline void sort4 (int * num) {
int tmp;
if (num[0] < num[1]) {
if (num[1] < num[2]) {
if (num[1] < num[3]) {
if (num[2] >= num[3]) {
tmp = num[2];
num[2] = num[3];
num[3] = tmp;
}
} else {
tmp = num[1];
if (num[0] < num[3]) {
num[1] = num[3];
} else {
num[1] = num[0];
num[0] = num[3];
}
num[3] = num[2];
num[2] = tmp;
}
} else {
if (num[0] < num[2]) {
if (num[2] < num[3]) {
if (num[1] < num[3]) {
tmp = num[1];
} else {
tmp = num[3];
num[3] = num[1];
}
num[1] = num[2];
num[2] = tmp;
} else {
if (num[0] < num[3]) {
tmp = num[3];
} else {
tmp = num[0];
num[0] = num[3];
}
num[3] = num[1];
num[1] = tmp;
}
} else {
if (num[0] < num[3]) {
tmp = num[0];
num[0] = num[2];
if (num[1] < num[3]) {
num[2] = num[1];
} else {
num[2] = num[3];
num[3] = num[1];
}
num[1] = tmp;
} else {
if (num[2] < num[3]) {
tmp = num[0];
num[0] = num[2];
num[2] = tmp;
tmp = num[1];
num[1] = num[3];
} else {
tmp = num[1];
num[1] = num[2];
num[2] = num[0];
num[0] = num[3];
}
num[3] = tmp;
}
}
}
} else {
tmp = num[0];
if (tmp < num[2]) {
if (tmp < num[3]) {
num[0] = num[1];
num[1] = tmp;
if (num[2] >= num[3]) {
tmp = num[2];
num[2] = num[3];
num[3] = tmp;
}
} else {
if (num[1] < num[3]) {
num[0] = num[1];
num[1] = num[3];
} else {
num[0] = num[3];
}
num[3] = num[2];
num[2] = tmp;
}
} else {
if (num[1] < num[2]) {
if (num[2] < num[3]) {
num[0] = num[1];
num[1] = num[2];
if (tmp < num[3]) {
num[2] = tmp;
} else {
num[2] = num[3];
num[3] = tmp;
}
} else {
if (num[1] < num[3]) {
num[0] = num[1];
num[1] = num[3];
} else {
num[0] = num[3];
}
num[3] = tmp;
}
} else {
if (num[1] < num[3]) {
num[0] = num[2];
if (tmp < num[3]) {
num[2] = tmp;
} else {
num[2] = num[3];
num[3] = tmp;
}
} else {
if (num[2] < num[3]) {
num[0] = num[2];
num[2] = num[1];
num[1] = num[3];
num[3] = tmp;
} else {
num[0] = num[3];
num[3] = tmp;
tmp = num[1];
num[1] = num[2];
num[2] = tmp;
}
}
}
}
}
}
static inline void sortAlt2 (int * numbers, int * altNumbers) {
if (numbers[0] <= numbers[1]) {
altNumbers[0] = numbers[0];
altNumbers[1] = numbers[1];
} else {
altNumbers[0] = numbers[1];
altNumbers[1] = numbers[0];
}
}
static inline void sortAlt3 (int * numbers, int * altNumbers) {
if (numbers[0] <= numbers[1]) {
if (numbers[1] <= numbers[2]) {
altNumbers[0] = numbers[0];
altNumbers[1] = numbers[1];
altNumbers[2] = numbers[2];
} else if (numbers[2] <= numbers[0]) {
altNumbers[0] = numbers[2];
altNumbers[1] = numbers[0];
altNumbers[2] = numbers[1];
} else {
altNumbers[0] = numbers[0];
altNumbers[1] = numbers[2];
altNumbers[2] = numbers[1];
}
} else {
if (numbers[0] <= numbers[2]) {
altNumbers[0] = numbers[1];
altNumbers[1] = numbers[0];
altNumbers[2] = numbers[2];
} else if (numbers[2] <= numbers[1]) {
altNumbers[0] = numbers[2];
altNumbers[1] = numbers[1];
altNumbers[2] = numbers[0];
} else {
altNumbers[0] = numbers[1];
altNumbers[1] = numbers[2];
altNumbers[2] = numbers[0];
}
}
}
/*
* Insert Sort
*/
inline void insertSort (int numbers[], int qty) {
int i, j, idx, q4;
int tmp;
if (qty <= 4) {
if (qty == 4) sort4 (numbers);
else if (qty == 3) sort3 (numbers);
else if (qty == 2) sort2 (numbers);
return;
}
q4 = qty - 4;
for (i=0; i < q4; i++) {
idx = i;
for (j=i+1; j < qty; j++) {
if (numbers[j] < numbers[idx]) idx = j;
}
if (idx != i) {
tmp = numbers[idx];
numbers[idx] = numbers[i];
numbers[i] = tmp;
}
}
sort4 (numbers + q4);
}
/*
* Heap Sort
*/
/* Assure the heap property for entries from top to last */
static void siftDown (int numbers[], int top, int last) {
int tmp = numbers[top];
int maxIdx = top;
while (last >= (maxIdx += maxIdx)) {
/* This is where the comparison occurrs and where a sufficiently
good compiler can use a computed conditional result rather
than using control logic. */
if (maxIdx != last && numbers[maxIdx] < numbers[maxIdx + 1]) maxIdx++;
if (tmp >= numbers[maxIdx]) break;
numbers[top] = numbers[maxIdx];
top = maxIdx;
}
numbers[top] = tmp;
}
/* Peel off the top siftDown operation since its parameters are trivial to
fill in directly (and this saves us some moves.) */
static void siftDown0 (int numbers[], int last) {
int tmp;
if (numbers[0] < numbers[1]) {
tmp = numbers[1];
numbers[1] = numbers[0];
siftDown (numbers, 1, last);
} else {
tmp = numbers[0];
}
numbers[0] = numbers[last];
numbers[last] = tmp;
}
void heapSort (int numbers[], int qty) {
int i;
if (qty <= 4) {
if (qty == 4) sort4 (numbers);
else if (qty == 3) sort3 (numbers);
else if (qty == 2) sort2 (numbers);
return;
}
i = qty / 2;
/* Enforce the heap property for each position in the tree */
for ( qty--; i > 0; i--) siftDown (numbers, i, qty);
for (i = qty; i >= 4; i--) siftDown0 (numbers, i);
sort4 (numbers);
}
/*
* Quick Sort
*/
static int medianOf3 (int * numbers, int i, int j) {
int tmp;
if (numbers[0] <= numbers[i]) {
if (numbers[j] <= numbers[0]) return numbers[0]; /* j 0 i */
if (numbers[i] <= numbers[j]) j = i; /* 0 i j */
/* 0 j i */
} else {
if (numbers[0] <= numbers[j]) return numbers[0]; /* i 0 j */
if (numbers[j] <= numbers[i]) j = i; /* j i 0 */
/* i j 0 */
}
tmp = numbers[j];
numbers[j] = numbers[0];
numbers[0] = tmp;
return tmp;
}
static void quickSortRecurse (int * numbers, int left, int right) {
int pivot, lTmp, rTmp;
qsrStart:;
#if defined(__GNUC__)
if (right <= left + 8) {
insertSort (numbers + left, right - left + 1);
return;
}
#else
if (right <= left + 3) {
if (right == left + 1) {
sort2 (numbers + left);
} else if (right == left + 2) {
sort3 (numbers + left);
} else if (right == left + 3) {
sort4 (numbers + left);
}
return;
}
#endif
lTmp = left;
rTmp = right;
pivot = medianOf3 (numbers + left, (right-left) >> 1, right-1-left);
goto QStart;
while (1) {
do {
right--;
if (left >= right) goto QEnd;
QStart:;
} while (numbers[right] > pivot);
numbers[left] = numbers[right];
do {
left++;
if (left >= right) {
left = right;
goto QEnd;
}
} while (numbers[ left] < pivot);
numbers[right] = numbers[left];
}
QEnd:;
numbers[left] = pivot;
/* Only recurse the smaller partition */
if (left-1 - lTmp <= rTmp - left - 1) {
if (lTmp < left) quickSortRecurse (numbers, lTmp, left-1);
/* Set up for larger partition */
left++;
right = rTmp;
} else {
if (rTmp > left) quickSortRecurse (numbers, left+1, rTmp);
/* Set up for larger partition */
right = left - 1;
left = lTmp;
}
/* Rerun with larger partition (recursion not required.) */
goto qsrStart;
}
void quickSort (int numbers[], int qty) {
if (qty < 2) return;
quickSortRecurse (numbers, 0, qty - 1);
}
/*
* Merge Sort
*/
static void mergesortInPlace (int * numbers, int * altNumbers, int qty);
/* Perform mergesort, but store results in altNumbers */
static void mergesortExchange (int * numbers, int * altNumbers, int qty) {
int half, i0, i1, i;
if (qty == 2) {
sortAlt2 (numbers, altNumbers);
return;
}
if (qty == 3) {
sortAlt3 (numbers, altNumbers);
return;
}
half = (qty + 1)/2;
mergesortInPlace (numbers, altNumbers, half);
mergesortInPlace (numbers + half, altNumbers, qty - half);
i0 = 0; i1 = half;
for (i=0; i < qty; i++) {
if (i1 >= qty || (i0 < half && numbers[i0] < numbers[i1])) {
altNumbers[i] = numbers[i0];
i0++;
} else {
altNumbers[i] = numbers[i1];
i1++;
}
}
}
/* Perform mergesort and store results in numbers */
static void mergesortInPlace (int * numbers, int * altNumbers, int qty) {
int half, i0, i1, i;
#if 0
if (qty == 2) {
sort2 (numbers);
return;
}
if (qty == 3) {
sort3 (numbers);
return;
}
if (qty == 4) {
sort4 (numbers);
return;
}
#else
if (qty <= 12) {
insertSort (numbers, qty);
return;
}
#endif
half = (qty + 1)/2;
mergesortExchange (numbers, altNumbers, half);
mergesortExchange (numbers + half, altNumbers + half, qty - half);
i0 = 0; i1 = half;
for (i=0; i < qty; i++) {
if (i1 >= qty || (i0 < half && altNumbers[i0] < altNumbers[i1])) {
numbers[i] = altNumbers[i0];
i0++;
} else {
numbers[i] = altNumbers[i1];
i1++;
}
}
}
#include <stdlib.h>
void mergeSort (int numbers[], int qty) {
int * tmpArray;
if (qty <= 12) {
insertSort (numbers, qty);
return;
}
tmpArray = (int *) malloc (qty * sizeof (int));
mergesortInPlace (numbers, tmpArray, qty);
free (tmpArray);
}
/********************************
* END OF PAUL'S IMPLEMENTATION *
********************************/
/*****************************************
* BEGIN OF Jon Bentley'S IMPLEMENTATION *
*****************************************/
typedef int DType;
int randint(int l, int u)
{
return l + (RAND_MAX*rand() + rand()) % (u-l+1);
}
inline void Bentleyswap(DType*x,int i, int j)
{
DType t = x[i];
x[i] = x[j];
x[j] = t;
}
void isort3(DType*data,int n)
{
int i, j;
DType t;
for (i = 1; i < n; i++) {
t = data[i];
for (j = i; j > 0 && data[j-1] > t; j--)
data[j] = data[j-1];
data[j] = t;
}
}
/* qsort3 + randomization + isort small subarrays + swap inline */
int cutoff = 32;
void qsort4(DType*data, int l, int u)
{
int i, j;
DType t;
if (u - l < cutoff)
return;
Bentleyswap(data,l, randint(l, u));
t = data[l];
i = l;
j = u+1;
for (;;) {
do i++; while (i <= u && data[i] < t);
do j--; while (data[j] > t);
if (i > j)
break;
//temp = data[i]; data[i] = data[j]; data[j] = temp;
Bentleyswap(data,i, j);
}
Bentleyswap(data,l, j);
qsort4(data,l, j-1);
qsort4(data,j+1, u);
}
void qsort5(DType*data, int l, int u)
{
int i, j;
DType t;
if (u - l < cutoff){
isort3(data+l,u-l+1);
return;
}
Bentleyswap(data,l, randint(l, u));
t = data[l];
i = l;
j = u+1;
for (;;) {
do i++; while (i <= u && data[i] < t);
do j--; while (data[j] > t);
if (i > j)
break;
//temp = data[i]; data[i] = data[j]; data[j] = temp;
Bentleyswap(data,i, j);
}
Bentleyswap(data,l, j);
qsort5(data,l, j-1);
qsort5(data,j+1, u);
}
//// copy from stl
//template<class _RanIt> inline
//void Med3(_RanIt _First, _RanIt _Mid, _RanIt _Last)
//{ // sort median of three elements to middle
// if (*_Mid < *_First)
// std::iter_swap(_Mid, _First);
//
// if (*_Last < *_Mid){ // swap middle and last, then test first again
// std::iter_swap(_Last, _Mid);
// if (*_Mid < * _First)
// std::iter_swap(_Mid, _First);
// }
//}
//
//template<class _RanIt> inline
//void Median(_RanIt _First, _RanIt _Mid, _RanIt _Last)
//{ // sort median element to middle
// if (40 < _Last - _First){ // median of nine
// size_t _Step = (_Last - _First + 1) / 8;
// Med3(_First, _First + _Step, _First + 2 * _Step);
// Med3(_Mid - _Step, _Mid, _Mid + _Step);
// Med3(_Last - 2 * _Step, _Last - _Step, _Last);
// Med3(_First + _Step, _Mid, _Last - _Step);
// }else
// Med3(_First, _Mid, _Last);
//}
template<class _RanIt> inline
_RanIt Med3(_RanIt _First, _RanIt _Mid, _RanIt _Last)
{
return (*_First < *_Mid)?
((*_Mid < *_Last)? _Mid: (*_First < *_Last) ? _Last:_First):
((*_Mid > *_Last)? _Mid: (*_First < *_Last) ? _First:_Last);
}
template<class _RanIt> inline
_RanIt Median(_RanIt _First, _RanIt _Mid, _RanIt _Last)
{ // sort median element to middle
if (40 < _Last - _First){ // median of nine
size_t _Step = (_Last - _First + 1) / 8;
_RanIt p1 = Med3(_First, _First + _Step, _First + 2 * _Step);
_RanIt p2 = Med3(_Mid - _Step, _Mid, _Mid + _Step);
_RanIt p3 = Med3(_Last - 2 * _Step, _Last - _Step, _Last);
return Med3(p1,p2,p3);
}else
return Med3(_First, _Mid, _Last);
}
void qsort6(DType*data, int l, int u)
{
int i, j;
DType t;
if (u - l < cutoff){
isort3(data+l,u-l+1);
return;
}
int Mid = l + (u + 1 - l) / 2; // sort median to _Mid
DType *pm = Med3(data+l, data+Mid, data+u);
t = *pm; *pm=data[l]; data[l]=t; //swap
i = l;
j = u+1;
for (;;) {
do i++; while (i <= u && data[i] < t);
do j--; while (data[j] > t);
if (i > j)
break;
Bentleyswap(data,i, j);
}
Bentleyswap(data,l, j);
qsort6(data,l, j-1);
qsort6(data,j+1, u);
}
void qsort6_1_0(DType*data, int l, int u)
{ //median of 3, without guard, final insertion sort
if (u - l < cutoff){
//isort3(data+l,u-l+1);
return;
}
int Mid = l + (u + 1 - l) / 2;
DType *pm = Med3(data+l, data+Mid, data+u);
DType t = *pm;
////3
int i = l, j = u+1;
for (;;)
{
while (data[i] < t) ++i;
--j;
while (t < data[j]) --j;
if(i>=j)
break;
Bentleyswap(data,i, j);
++i;
}
qsort6_1_0(data,l, i-1);
qsort6_1_0(data,i, u);
}
void qsort6_1_1(DType*data, int l, int u)
{ //median of 3, without guard, final insertion sort
// using SortBench_STLPORT::__median
if (u - l < cutoff)
return;
int Mid = l + (u + 1 - l) / 2; // sort median to _Mid
DType t = SortBench_STLPORT::__median3(data[l],data[Mid],data[u]);
int i = l, j = u+1;
for (;;)
{
while (data[i] < t) ++i;
--j;
while (t < data[j]) --j;
if(i>=j)
break;
Bentleyswap(data,i, j);
++i;
}
qsort6_1_1(data,l, i-1);
qsort6_1_1(data,i, u);
}
void qsort6_1_2(DType*data, int l, int u)
{ //median of 3, without guard, final insertion sort
//using SortBench_STLPORT::__unguarded_partition
if (u - l < cutoff)
return;
int Mid = l + (u + 1 - l) / 2;
DType t = *(Med3(data+l, data+Mid, data+u));
DType* cut = SortBench_STLPORT::__unguarded_partition(data+l,data+u+1,t);
int i = cut-data;
qsort6_1_2(data,l, i-1);
qsort6_1_2(data,i, u);
}
inline DType* partition6_1_2_0(DType*first,DType*last,DType pivot)
{
// manually implement SortBench_STLPORT::__unguarded_partition
for(;;){
while( *first < pivot) ++first;
do --last; while (pivot < *last);
if(first >= last)
return first;
std::iter_swap(first, last);
++first;
}
}
void qsort6_1_2_0(DType*data, int l, int u)
{ //median of 3, without guard, final insertion sort
// using partition6_1_2_0,
if (u - l < cutoff)
return;
int Mid = l + (u + 1 - l) / 2;
DType t = *(Med3(data+l, data+Mid, data+u));
DType* cut = partition6_1_2_0(data+l,data+u+1,t);
int i = cut-data;
qsort6_1_2_0(data,l, i-1);
qsort6_1_2_0(data,i, u);
}
void qsort6_1_3(DType*data, int l, int u)
{ //median of 3, without guard, final insertion sort
// using SortBench_STLPORT::__median
// using SortBench_STLPORT::__unguarded_partition
if (u - l < cutoff)
return;
int Mid = l + (u + 1 - l) / 2; // sort median to _Mid
DType t = SortBench_STLPORT::__median3(data[l],data[Mid],data[u]);
DType* cut = SortBench_STLPORT::__unguarded_partition(data+l,data+u+1,t);
int i = cut-data;
qsort6_1_3(data,l, i-1);
qsort6_1_3(data,i, u);
}
void qsort7(DType*data, int l, int u)
{
int i, j;
DType t;
if (u - l < cutoff){
isort3(data+l,u-l+1);
return;
}
//if (u <= l){return;}
int Mid = l + (u + 1 - l) / 2; // sort median to _Mid
DType *pm = Median(data+l, data+Mid, data+u);
t = *pm; *pm=data[l]; data[l]=t; //swap
i = l;
j = u+1;
for (;;) {
do i++; while (i <= u && data[i] < t);
do j--; while (data[j] > t);
if (i > j)
break;
Bentleyswap(data,i, j);
}
Bentleyswap(data,l, j);
qsort7(data,l, j-1);
qsort7(data,j+1, u);
}
void qsort8(DType*data, int l, int r)
{
DType t;
if (r - l < cutoff){
isort3(data+l,r-l+1);
return;
}
//if (r <= l){return;}
int Mid = l + (r + 1 - l) / 2; // sort median to _Mid
DType *pm = Median(data+l, data+Mid, data+r);
t = *pm; *pm=data[r]; data[r]=t; //swap
int i = l-1, j = r, p = l-1, q = r;
for (;;){
while (data[++i] < t);
while (t < data[--j]) if (j == l) break;
if(i>=j) break;
Bentleyswap(data,i, j);
if (data[i] == t) { p++; Bentleyswap(data, p, i); }
if (t == data[j]) { q--; Bentleyswap(data,j, q); }
}
Bentleyswap(data,i, r); j = i-1; i = i+1;
for (int k = l; k < p; k++, j--) Bentleyswap(data,k, j);
for (int k = r-1; k > q; k--, i++) Bentleyswap(data,i, k);
qsort8(data,l, j);
qsort8(data,i, r);
}
/***************************************
* END OF Jon Bentley'S IMPLEMENTATION *
***************************************/
struct intcmp_t {
inline int operator() (int a, int b) const {
return a < b? -1 : a > b? 1 : 0;
}
};
int compare_int(int a, int b)
{
return a < b? -1 : a > b? 1 : 0;
}
int compare(const void *a, const void *b)
{
return *((int*)a) - *((int*)b);
}
void recur_msort(int n, int *b, int *buf)
{
int *b0 = buf, *b1, *b2 ;
int n1, n2 ;
n1 = n / 2 ; n2 = n - n1 ;
b1 = b ; b2 = b + n1 ;
if (n1 > 1) recur_msort(n1, b1, buf);
if (n2 > 1) recur_msort(n2, b2, buf);
if (*(b2-1) <= *b2) return;
while (n1 > 0 && n2 > 0)
if (*b1 < *b2)
{ n1-- ; *b0++ = *b1++ ; }
else
{ n2-- ; *b0++ = *b2++ ; }
if (n1 > 0) memcpy(b0, b1, n1 * sizeof (int)) ;
memcpy(b, buf, (n - n2) * sizeof (int)) ;
}
// Comb sort, adapted from D codes on this page:
// http://www.digitalmars.com/d/archives/digitalmars/D/announce/Sorting_algorithms_benchmark_7661.html
template<class TYPE>
void algo_combsort(size_t n, TYPE a[])
{
const double shrink_factor = 1.2473309501039786540366528676643474234433714124826;
int do_swap;
size_t i, gap = n;
TYPE tmp;
do {
if (gap > 1) {
gap = (size_t)(gap / shrink_factor);
if (gap == 9 || gap == 10) gap = 11;
}
do_swap = 0;
for (i = 0; i < n - gap; ++i) {
size_t j = i + gap;
if (a[j] < a[i]) {
tmp = a[i]; a[i] = a[j]; a[j] = tmp;
do_swap = 1;
}
}
} while (do_swap || gap > 1);
}
void doSort(int* a, int left, int right);