排序算法之歸併排序(C語言)

#include <stdio.h>
#include <stdlib.h>
void swap(int* p1,int* p2){
    int tmp=*p1;
    *p1=*p2;
    *p2=tmp;
}

void printArray(const int* array,int size){
    for(int i=0;i<size;i++)
        printf("%d ",array[i]);
    printf("\n");
}

void selectionSort(int* array,int size){
    int minv,min;
    for(int i=0;i<size-1;i++){
        minv=array[i];
        min=i;
        for(int j=i+1;j<size;j++){
            if (array[j]<minv)
            {
                minv=array[j];
                min=j;
            }
        }
        if(min-i) swap(&array[i],&array[min]);
        printf("%d: ",i);
        printArray(array,6);
    }
}

void insertionSort(int* array,int size){
    int x;
    for(int i=1,j;i<size;i++){
        x=array[i];
        for(j=i;j>0 && array[j-1]>x;j--){
            array[j]=array[j-1];
        }
        array[j]=x;
        printf("%d: ",i);
        printArray(array,size);
    }
}
void merge(int* array,int* tmp,int left,int mid,int right){
    int leftend,ti,t;
    leftend=mid-1;
    t=ti=left;
    while(left<=leftend && mid<=right){
        if(array[left]<=array[mid]) tmp[ti++]=array[left++];    // 穩定排序
        else    tmp[ti++]=array[mid++];
    }
    while(left<=leftend)    tmp[ti++]=array[left++];
    while(mid<=right)   tmp[ti++]=array[mid++];
    for(int i=t;i<=right;i++)
        array[i]=tmp[i];
}
void msort(int* array,int* tmp,int left,int right){
    if(left>=right) return;
    int mid=(left+right)/2;
    msort(array,tmp,left,mid);
    msort(array,tmp,mid+1,right);
    merge(array,tmp,left,mid+1,right);  // merge two parts
}
void mergeSort(int* array,int size){
    int* tmp;
    tmp=(int*)malloc(sizeof(int)*size);
    if(!tmp)    return;
    msort(array,tmp,0,size-1);
    free(tmp);
}

int main(){
    int array[]={5,4,3,2,999,1,0,-100};
//    printArray(array,6);
//    printf("\n------selectionSort------\n");
//    selectionSort(array,6);
//    printf("\n------insertionSort------\n");
//    insertionSort(array,6);
    printf("%d\n",sizeof(array)/sizeof(int));
    mergeSort(array,sizeof(array)/sizeof(int));
    printArray(array,sizeof(array)/sizeof(int));
    return 0;
}