STL_算法（24）_删除_(3)uinique() unique

本文介绍了C++标准库中的unique算法使用方法，通过实例展示了如何去除容器中连续重复元素，并探讨了不同比较条件的应用场景。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

remove()

remove_if()

remove_copy()

// 删除连续的重复的算法，只留下唯一的

uinique()

unique_copy()

unique(b, e)

unique(b, e, p)

unique_copy(b1, e1, b2)

unique_copy(b1, e1, b2, p)

注意：

1，没有unique_if()

2, 没有unique_copy_if()

#include<iostream>
#include<algorithm>
#include<list>
//
//#include<functional>
#include<iterator>

using namespace std;

int main()
{
	int source[] = {1, 4, 4, 6, 1, 2, 2, 3, 1, 6, 6, 6, 5, 7, 5, 4, 4};
	int sourceNum = sizeof(source) / sizeof(source[0]);

	list<int> ilist;
	copy(source, source + sourceNum, back_inserter(ilist));

	for(list<int>::iterator iter = ilist.begin(); iter != ilist.end(); iter++)
		cout<<*iter<< ' ';
	cout<<endl;
	
	list<int>::iterator pos;

	// 把连续的数据进行删除
	pos = unique(ilist.begin(), ilist.end());
	
	for(list<int>::iterator iter = ilist.begin(); iter != pos; iter++)
		cout<<*iter<< ' ';
	cout<<endl;

	//
	system("pause");
	return 0;
}

#include<iostream>
#include<algorithm>
#include<list>
//
//#include<functional>
#include<iterator>
bool differeceOne(int elem1, int elem2)
{
	return elem1 + 1 == elem2 || elem1 -1 == elem2;
}

using namespace std;

int main()
{
	int source[] = {1, 4, 4, 6, 1, 2, 2, 3, 1, 6, 6, 6, 5, 7, 5, 4, 4};
	int sourceNum = sizeof(source) / sizeof(source[0]);

	list<int> ilist;
	copy(source, source + sourceNum, back_inserter(ilist));

	for(list<int>::iterator iter = ilist.begin(); iter != ilist.end(); iter++)
		cout<<*iter<< ' ';
	cout<<endl;
	
	list<int>::iterator pos;

	// 把连续的数据进行删除
	pos = unique(ilist.begin(), ilist.end());
	
	for(list<int>::iterator iter = ilist.begin(); iter != pos; iter++)
		cout<<*iter<< ' ';
	cout<<endl;

	copy(source, source + sourceNum, ilist.begin());
	for(list<int>::iterator iter = ilist.begin(); iter != ilist.end(); iter++)
		cout<<*iter<< ' ';
	cout<<endl;

	//若前面的数字不后面的数字大，把后面的数字删除
	pos = unique(ilist.begin(), ilist.end(), greater<int>());
	for(list<int>::iterator iter = ilist.begin(); iter != pos; iter++)
		cout<<*iter<<' ';
	cout<<endl;

	copy(source, source + sourceNum, ilist.begin());
	for(list<int>::iterator iter = ilist.begin(); iter != ilist.end(); iter++)
		cout<<*iter<< ' ';
	cout<<endl;
	//将数据复制到另外的数组里
	unique_copy(ilist.begin(), ilist.end(), ostream_iterator<int>(cout, " "));
	cout<<endl;	

	unique_copy(ilist.begin(), ilist.end(), ostream_iterator<int>(cout, " "), differeceOne);
	//
	system("pause");
	return 0;
}