C++归并排序算法

C++归并排序算法

 *MERGE-SORT
 */
#include<cstdlib>
#include<limits>
#include<iostream>
#include<vector>
#include<iomanip>
using namespace std;
typedef vector<int>::iterator ivecIte;
void merge(vector<int> &ivec, 
				   ivecIte iteB, ivecIte iteMark, ivecIte iteE)
{
	vector<int> v1(iteB, iteMark),
					  v2(iteMark, iteE);
	//哨兵！！！
	v1.push_back(numeric_limits<int>::max());
	v2.push_back(numeric_limits<int>::max());
	ivecIte ite1 = v1.begin(), ite2 = v2.begin();
	for(ivecIte iteTurn = iteB; iteE != iteTurn; ++iteTurn){
		if(*ite2 > *ite1) {*iteTurn = *ite1; ite1++;}
		else{*iteTurn = *ite2; ite2++;}
	}
}
void mergeSort(vector<int> &ivec,
					    ivecIte iteB, ivecIte iteE)
{
	size_t div = iteE - iteB;
	if(1 < div) {
		div /= 2;
		mergeSort(ivec, iteB, iteB + div);
		mergeSort(ivec, iteB + div, iteE);
		merge(ivec, iteB, iteB + div, iteE);
	}
}
		
int main()
{
	vector<int> ivec;
	cout<<"input some integers with end-of-file!"<<endl;
	int inData;
	while(cin>>inData) ivec.push_back(inData);
	ivecIte iteS = ivec.begin(), iteE = ivec.end();
	mergeSort(ivec, iteS, iteE);
	for(iteS = ivec.begin(); iteS != ivec.end(); ++iteS)
		cout<<setw(5)<<*iteS;
	cout<<endl;
	system("PAUSE");
	return EXIT_SUCCESS;
}