C++ Tutorial/STL Algorithms Non modifying sequence operations/equal
Версия от 14:21, 25 мая 2010; (обсуждение)
equal algorithm: a deque and the first 2 elements of a list are not equal in all corresponding positions
#include <iostream>
#include <cassert>
#include <algorithm>
#include <string>
#include <list>
#include <deque>
#include <vector>
using namespace std;
int main()
{
list<string> driver_list;
vector<string> vec;
deque<string> deq;
driver_list.insert(driver_list.end(), "AAA");
driver_list.insert(driver_list.end(), "BBBB");
driver_list.insert(driver_list.end(), "CCCCC");
deq.insert(deq.end(), "AAA");
deq.insert(deq.end(), "DDDDDD");
cout << (equal(deq.begin(), deq.end(),driver_list.begin()));
return 0;
}0
equal algorithm: a list and the first 3 elements of a vector are equal in all corresponding positions
#include <iostream>
#include <cassert>
#include <algorithm>
#include <string>
#include <list>
#include <deque>
#include <vector>
using namespace std;
int main()
{
list<string> driver_list;
vector<string> vec;
deque<string> deq;
driver_list.insert(driver_list.end(), "AAA");
driver_list.insert(driver_list.end(), "BBBB");
driver_list.insert(driver_list.end(), "CCCCC");
vec.insert(vec.end(), "AAA");
vec.insert(vec.end(), "BBBB");
vec.insert(vec.end(), "CCCCC");
vec.insert(vec.end(), "DDDDDD");
cout<< (equal(driver_list.begin(), driver_list.end(),vec.begin()));
return 0;
}1
Use std::equal to compare vectors v1 and v2 for equality
#include <iostream>
using std::cout;
using std::endl;
#include <algorithm>
#include <vector>
#include <iterator>
int main()
{
int a1[ 10 ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int a2[ 10 ] = { 1, 2, 3, 4, 9, 6, 7, 8, 9, 10 };
std::vector< int > v1( a1, a1 + 10 );
std::vector< int > v2( a1, a1 + 10 );
std::vector< int > v3( a2, a2 + 10 );
std::ostream_iterator< int > output( cout, " " );
cout << "Vector v1 contains: ";
std::copy( v1.begin(), v1.end(), output );
cout << "\nVector v2 contains: ";
std::copy( v2.begin(), v2.end(), output );
cout << "\nVector v3 contains: ";
std::copy( v3.begin(), v3.end(), output );
// compare vectors v1 and v2 for equality
bool result = std::equal( v1.begin(), v1.end(), v2.begin() );
cout << "\n\nVector v1 " << ( result ? "is" : "is not" )
<< " equal to vector v2.\n";
return 0;
}Vector v1 contains: 1 2 3 4 5 6 7 8 9 10 Vector v2 contains: 1 2 3 4 5 6 7 8 9 10 Vector v3 contains: 1 2 3 4 9 6 7 8 9 10 Vector v1 is equal to vector v2.
