还有一个大案例，那个就不急了，完结撒花，起码C++是打代码没什么大问题的完结，不像C，还要我返工/笑哭

常用算数生成算法

属于小算法，头文件 #include <numeric> 
accumulate  //计算容器累计总和
fill  //容器中添加元素

ACCUMULATE

accumulate  //计算容器累计总和 
accumulate(begin,end,val)           /val==累加起始值

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<numeric>
using namespace std;
/*
accumulate(begin,end,val)  //val==起始值
*/
void myprint(int val) {cout << val << "  ";
}
void test01() {vector<int>v;for (int i = 0; i <= 100; i++) {v.push_back(i);}int sum=accumulate(v.begin(), v.end(), 0);cout <<sum<< endl;sum = accumulate(v.begin(), v.end(), 1000);cout << sum << endl;}
void test02() {}
int main() {test01();test02();return 0;
}

FILL

fill  //容器中添加元素       fill(begin,end,val) 

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<numeric>
using namespace std;
/*
fill(begin,end,val)  
*/
void myprint(int val) {cout << val << "  ";
}
void test01() {vector<int>v;v.resize(10);fill(v.begin(), v.end(), 1000);for_each(v.begin(), v.end(), myprint);cout << endl;
}
void test02() {}
int main() {test01();test02();return 0;
}

常用集合算法

set_intersection  //交集
set_union  //并集
set_difference  //差集 
都必须是有序数列，返回迭代器

SET_INTERECTION

set_intersection  //交集      set_intersection(beg1,end1,beg2,end2,iterator dest)返回迭代器

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
//#include<numeric>
using namespace std;
/*
set_intersection(beg1,end1,beg2,end2,iterator dest)
*/
void myprint(int val) {cout << val << "  ";
}
void test01() {vector<int>v;vector<int>v1;vector<int>v2;for (int i = 0; i < 10; i++) {v.push_back(i);v1.push_back(i+5);}//v2.resize(v.size() < v1.size()?v.size():v1.size());//提前开辟v2.resize(min(v.size(), v1.size()));vector<int>::iterator iEnd = set_intersection(v.begin(), v.end(), v1.begin(), v1.end(), v2.begin());for_each(v2.begin(), v2.end(), myprint);cout << endl;for_each(v2.begin(), iEnd, myprint);//用返回的迭代器打印输出
}
void test02() {}
int main() {test01();test02();return 0;
}

SET_UNION

set_union  //并集       set_intersection(beg1,end1,beg2,end2,iterator dest)

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;void myprint(int val) {cout << val << "  ";
}
void test01() {vector<int>v;vector<int>v1;vector<int>v2;for (int i = 0; i < 10; i++) {v.push_back(i);v1.push_back(i+5);}v2.resize(v.size()+v1.size());vector<int>::iterator iEnd = set_union(v.begin(), v.end(), v1.begin(), v1.end(), v2.begin());for_each(v2.begin(), v2.end(), myprint);cout << endl;for_each(v2.begin(), iEnd, myprint);//用返回的迭代器打印输出
}
void test02() {}
int main() {test01();test02();return 0;
}

SET_DIFFERENCE

set_difference  //差集     set_difference(beg1,end1,beg2,end2,iterator dest)

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;void myprint(int val) {cout << val << "  ";
}
void test01() {vector<int>v;vector<int>v1;vector<int>v2;for (int i = 0; i < 10; i++) {v.push_back(i);v1.push_back(i+5);}v2.resize(v.size());vector<int>::iterator iEnd = set_difference(v.begin(), v.end(), v1.begin(), v1.end(), v2.begin());for_each(v2.begin(), v2.end(), myprint);cout << endl;for_each(v2.begin(), iEnd, myprint);//用返回的迭代器打印输出cout << endl;fill(v2.begin(), v2.end(), 0);for_each(v2.begin(), v2.end(), myprint);cout << endl;iEnd = set_difference(v1.begin(), v1.end(), v.begin(), v.end(), v2.begin());for_each(v2.begin(), iEnd, myprint);//用返回的迭代器打印输出cout << endl;
}
void test02() {}
int main() {test01();test02();return 0;
}