第十章 習題10-31-習題10-40

習題10-31

#include <iostream>
#include<algorithm>
#include <vector>
#include<iterator>
using namespace std;
int main()
{
	istream_iterator<int> int_in(cin), int_eof;
	ostream_iterator<int> out(cout, " ");
	vector<int> vec(int_in, int_eof);
	sort(vec.begin(), vec.end());
	unique_copy(vec.begin(), vec.end(), out);
	cout << endl;
}

習題10-32

略，前三章沒寫；

習題10-33

#include <iostream>
#include<fstream>
#include<algorithm>
#include <vector>
#include<iterator>
using namespace std;
int main()
{
	ifstream file1("data1.txt");
	ofstream file2("data2.txt"), file3("data3.txt");
	istream_iterator<int> int_in(file1), int_eof;
	ostream_iterator<int> out_1(file2, " "), out_2(file3, "\n");
	vector<int> vec(int_in, int_eof);
	for (auto it = vec.begin(); it != vec.end(); ++it)
	{
		if (*it % 2 != 0)
			*out_1++ = *it;
		else
			*out_2++ = *it;
	}
}

習題10-34

#include <iostream>
#include <vector>
using namespace std;
int main()
{
	vector<int> vec = { 1,2,3,4,5,6,7,8,9 };
	for (auto iter = vec.rbegin(); iter != vec.rend(); ++iter)
		cout << *iter << "  ";
	cout << endl;

}

習題10-35

#include <iostream>
#include <vector>
using namespace std;
int main()
{
	vector<int> vec = { 1,2,3,4,5,6,7,8,9 };
	for (auto iter = vec.end(); iter != vec.begin(); --iter)
		cout << *(iter-1) << "  ";
	cout << endl;
}

習題10-36

#include <iostream>
#include <list>
using namespace std;
int main()
{
	list<int> lst = { 1,0,2,0,3,0,4};
	auto zero = find(lst.rbegin(), lst.rend(), 0);
	cout << *zero << endl;
	cout << *(--zero) << endl;
	cout << *(++zero) << endl;
	cout << *(++zero) << endl;
}

習題10-37

#include <iostream>
#include<algorithm>
#include <list>
#include<vector>
using namespace std;
int main()
{
	vector<int> vec = { 1,2,3,4,5,6,7,8,9,10};
	list<int> lst(5);
	copy(vec.rbegin() + 3, vec.rbegin() + 8, lst.begin());
	for (auto iter = lst.begin(); iter != lst.end(); ++iter)
		cout << *iter << "  ";
}

習題10-38

略，看書

需要注意的事隨機訪問迭代器是可以加整數的，其他的不可以

習題10-39

list：雙向迭代器。vector：隨機訪問迭代器

list迭代器是雙向迭代器，不能加整數，vector可以；

習題10-40

copy的三個參數，第一二個數輸入迭代器，第三個是輸出迭代器；

reverse要求雙向迭代器的；

unique要求前向迭代器；