STL查找算法实例

#include<algorithm>
#include<vector>
#include<iostream>
#include<string>
#include<utility>
using namespace std;
int main()
{
	//create a vector of strings
	vector<string> s;
	vector<string>::iterator iter1;
	vector<string>::iterator iter2;

	s.push_back("juice");
	s.push_back("apples");
	s.push_back("rice");
	s.push_back("juice");
	s.push_back("bread");
	s.push_back("oranges");
	s.push_back("juice");
	s.push_back("milk");
	s.push_back("ice cream");
	s.push_back("carrots");

	//display the vector
	for(iter1=s.begin();iter1!=s.end();iter1++)
	{
		cout<<*iter1<<endl;
	}
	//sort the vector
	sort(s.begin(),s.end());
	cout<<"sorted vector :"<<endl;
	for(iter1=s.begin();iter1!=s.end();iter1++)
	{
		cout<<*iter1<<endl;
	}
	string str("juice");
	//perform binary search for item
	//display whether item was found or not 
	cout<<endl<<"binary search :"
		<<bool(binary_search(s.begin(),s.end(),str))<<endl;

	//find range of equal items with lower and upper bounds
	iter1=lower_bound(s.begin(),s.end(),str);
	iter2=upper_bound(s.begin(),s.end(),str);
        int i=0;
	for(iter1;iter1!=iter2;iter1++)
		i++;
	cout<<i<<" occurrences of "<<*(--iter1)<<endl;
	//find range of equal items with equal_range
	pair<vector<string>::iterator,vector<string>::iterator> 
		eq=equal_range(s.begin(),s.end(),str);
	//display occurences of item
	cout<<endl<<"Finding equal_range for "<<str<<" : "<<endl;
	i=0;
	for(eq.first;eq.first!=eq.second;eq.first++)
		i++;
	cout<<i<<" occurrences of "<<*(--eq.first)<<endl;
	return 0;

}