代码如下:

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
using namespace std;void test01()
{vector<int>v;for (int i = 0; i < 10; i++){v.push_back(i);}vector<int>::iterator it = find(v.begin(), v.end(), 5);if (it == v.end()){cout << "no find" << endl;}else{cout << "find " << *it << endl;}}class Person
{
public:Person(string name,int age):name(name),age(age){}bool operator==(const Person &p){if (name == p.name && age == p.age){return true;}return false;}string name;int age;
};void test02()
{vector<Person>v;Person p1("Tom", 28);Person p2("Jack", 78);Person p3("Bom",18);Person p4("Lily", 21);Person p5("Mike", 38);v.push_back(p1);v.push_back(p2);v.push_back(p3);v.push_back(p4);v.push_back(p5);vector<Person>::iterator it = find(v.begin(), v.end(), p2);if (it == v.end()){cout << "no find" << endl;}else{cout << "name = " << it->name << " " << "age = " << it->age << endl;}}int main()
{test01();test02();return 0;
}

测试结果:

代码如下:

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
using namespace std;class GreaterFive
{
public:bool operator()(int a){return a > 5;}
};void test01()
{vector<int>v;for (int i = 0; i < 10; i++){v.push_back(i+1);}vector<int>::iterator it = find_if(v.begin(), v.end(), GreaterFive());if (it == v.end()){cout << "no find" << endl;}else{cout << "find elem" << endl;}}class Person
{
public:Person(string name, int age) :name(name), age(age){}bool operator==(const Person & p) {if (this->name == p.name && this->age == p.age){return true;}return false;}string name;int age;
};class Greater20
{
public:bool operator()(Person &p){return p.age > 20;}
};void test02()
{vector<Person> v;Person p1("Tom", 10);Person p2("Jack", 20);Person p3("Bom", 30);Person p4("Mike", 40);v.push_back(p1);v.push_back(p2);v.push_back(p3);v.push_back(p4);vector<Person>::iterator it = find_if(v.begin(), v.end(), Greater20());if (it == v.end()){cout << "no find" << endl;}else{cout << "name = " << it->name << "age = " << it->age << endl;}}int main()
{test01();test02();return 0;
}

测试结果:

代码如下:

#include <iostream>
#include <algorithm>
#include <vector>using namespace std;void test01()
{vector<int>v;v.push_back(1);v.push_back(2);v.push_back(4);v.push_back(5);v.push_back(7);v.push_back(8);v.push_back(5);v.push_back(4);v.push_back(4);vector<int>::iterator it = adjacent_find(v.begin(), v.end());if (it == v.end()){cout << "no find" << endl;}else{cout << "find" << " " << *it << endl;}}int main()
{test01();return 0;
}

测试结果:

总结:

代码如下:

#include <iostream>
#include <algorithm>
#include <vector>using namespace std;void test01()
{vector<int>v;for (int i = 0; i < 10; i++){v.push_back(i);}bool ret = binary_search(v.begin(), v.end(),2);if (ret){cout << "find" << endl;}else{cout << "no find" << endl;}
}int main()
{test01();return 0;
}

测试结果:

总结:

代码如下:

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>using namespace std;void test01()
{vector<int>v;v.push_back(1);v.push_back(2);v.push_back(4);v.push_back(5);v.push_back(7);v.push_back(8);v.push_back(5);v.push_back(4);v.push_back(4);int num = count(v.begin(), v.end(), 4);cout << "4 count = " << num << endl;}class Person
{
public:Person(string name,int age):name(name),age(age){}bool operator==(const Person &p){if (age == p.age) return true;else{return false;}}string name;int age;
};void test02()
{vector<Person> v;Person p1("Tom", 35);Person p2("Mike", 35);Person p3("Lily", 35);Person p4("Bom", 25);Person p5("Jike", 25);v.push_back(p1);v.push_back(p2);v.push_back(p3);v.push_back(p4);v.push_back(p5);Person p("yhf", 35);int num = count(v.begin(), v.end(), p);cout << "num = " << num << endl;
}int main()
{test01();test02();return 0;
}

测试结果:

总结:

代码如下：

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;class Greater20
{
public:bool operator()(int val){return val > 20;}
};void test01()
{vector<int>v;v.push_back(10);v.push_back(40);v.push_back(30);v.push_back(50);v.push_back(20);int num = count_if(v.begin(), v.end(), Greater20());cout << "num = " << num << endl;}class Person
{
public:Person(string name,int age):name(name),age(age){}string name;int age;
};class ageGreater20
{
public:bool operator()(Person &p){return p.age > 20;}
};void test02()
{vector<Person>v;Person p1("Tom", 30);Person p2("Lily", 18);Person p3("Jack", 27);Person p4("Mike", 32);Person p5("Bom", 15);v.push_back(p1);v.push_back(p2);v.push_back(p3);v.push_back(p4);v.push_back(p5);int num = count_if(v.begin(), v.end(), ageGreater20());cout << "age num = " << num << endl;
}int main()
{test01();test02();return 0;
}

测试结果: