cb40a_c++_STL_算法_交换swap_ranges

cb40a_c++_STL_算法_交换swap_ranges
swap_ranges(b,e,b2);
如果两个容器的数据数量不一致时，只交换一部分数据，
a里面3个，b里面5个，则只会交换3个，b里面还有两个不变

注意：下列两种方法也是交换算法
1.容器的swap()成员函数
2.赋值操作

  1 /*cb40a_c++_STL_算法_交换swap_ranges
  2 swap_ranges(b,e,b2);
  3 如果两个容器的数据数量不一致时，只交换一部分数据，
  4 a里面3个，b里面5个，则只会交换3个，b里面还有两个不变
  5 
  6 注意：下列两种方法也是交换算法
  7 1.容器的swap()成员函数
  8 2.赋值操作
  9 
 10 */
 11 
 12 #include <iostream>
 13 #include <algorithm>
 14 #include <vector>
 15 #include <deque>
 16 
 17 using namespace std;
 18 
 19 int main()
 20 {
 21     vector<int> ivec;
 22     deque<int> ideq;
 23 
 24     for (int i = 1; i <= 9; ++i)
 25         ivec.push_back(i);
 26     for (int i = 11; i <= 23; ++i)
 27         ideq.push_back(i);
 28     cout << "vector数据" << endl;
 29     for (vector<int> ::iterator iter = ivec.begin(); iter != ivec.end(); ++iter)
 30         cout << *iter << ' ';
 31     cout << endl;
 32     cout << "deque的数据" << endl;
 33     for (deque<int>::iterator iter = ideq.begin(); iter != ideq.end(); ++iter)
 34         cout << *iter << ' ';
 35     cout << endl;
 36     cout << "vector与deque的数据交换" << endl;
 37 
 38     swap_ranges(ivec.begin(), ivec.end(), ideq.begin());
 39 
 40 
 41 
 42     //再次显示：
 43     cout << "vector数据" << endl;
 44     for (vector<int> ::iterator iter = ivec.begin(); iter != ivec.end(); ++iter)
 45         cout << *iter << ' ';
 46     cout << endl;
 47     cout << "deque的数据" << endl;
 48     for (deque<int>::iterator iter = ideq.begin(); iter != ideq.end(); ++iter)
 49         cout << *iter << ' ';
 50     cout << endl;
 51 
 52 
 53     deque<int>::iterator pos;
 54     pos = swap_ranges(ivec.begin(), ivec.end(), ideq.begin());
 55     if (pos != ideq.end())
 56     {
 57         cout << "还存在没有交换完的数据： 位置是：" << *pos << endl;
 58     }
 59 
 60     //再次显示：
 61     cout << "vector数据" << endl;
 62     for (vector<int> ::iterator iter = ivec.begin(); iter != ivec.end(); ++iter)
 63         cout << *iter << ' ';
 64     cout << endl;
 65     cout << "deque的数据" << endl;
 66     for (deque<int>::iterator iter = ideq.begin(); iter != ideq.end(); ++iter)
 67         cout << *iter << ' ';
 68     cout << endl;
 69 
 70     cout << "ideq里面：前面的三个数据和后面的三个数据相互交换" << endl;
 71     swap_ranges(ideq.begin(), ideq.begin()+ 3, ideq.rbegin());
 72     for (deque<int>::iterator iter = ideq.begin(); iter != ideq.end(); ++iter)
 73         cout << *iter << ' ';
 74     cout << endl;
 75 
 76     vector<int>ivec1;
 77     vector<int>ivec2;
 78     ivec1.push_back(1);
 79     ivec1.push_back(2);
 80     ivec1.push_back(3);
 81 
 82     ivec2.push_back(10);
 83     ivec2.push_back(20);
 84     ivec2.push_back(30);
 85 
 86     cout << "交换前vector1的数据：" << endl;
 87     for (vector<int> ::iterator iter = ivec1.begin(); iter != ivec1.end(); ++iter)
 88         cout << *iter << ' ';
 89     cout << endl;
 90     cout << "交换前vector2的数据：" << endl;
 91 
 92     for (vector<int> ::iterator iter = ivec2.begin(); iter != ivec2.end(); ++iter)
 93         cout << *iter << ' ';
 94     cout << endl;
 95 
 96     ivec1.swap(ivec2);
 97     cout << "ivec1.swap(ivec2);实际交换的是指针---,速度快。" << endl;
 98 
 99     cout << "交换后vector1的数据：" << endl;
100     for (vector<int> ::iterator iter = ivec1.begin(); iter != ivec1.end(); ++iter)
101         cout << *iter << ' ';
102     cout << endl;
103     cout << "交换后vector2的数据：" << endl;
104 
105     for (vector<int> ::iterator iter = ivec2.begin(); iter != ivec2.end(); ++iter)
106         cout << *iter << ' ';
107     cout << endl;
108 
109 
110 
111     return 0;
112 }

 

posted @ 2020-02-23 17:14  txwtech  阅读(333)  评论(0)  编辑  收藏  举报