C++容器求和

可以使用STL中的容器来求和。以下是一些常用容器的示例：

1. vector：

#include <iostream>
#include <vector>

using namespace std;

int main()
{
    vector<int> numbers = {1, 2, 3, 4, 5};
    int sum = 0;
    for(int i = 0; i < numbers.size(); i++){
        sum += numbers[i];
    }
    cout << "The sum is: " << sum << endl;
    return 0;
}

2. list：

#include <iostream>
#include <list>

using namespace std;

int main()
{
    list<int> numbers = {1, 2, 3, 4, 5};
    int sum = 0;
    for(auto it = numbers.begin(); it != numbers.end(); it++){
        sum += *it;
    }
    cout << "The sum is: " << sum << endl;
    return 0;
}

3. set：

#include <iostream>
#include <set>

using namespace std;

int main()
{
    set<int> numbers = {1, 2, 3, 4, 5};
    int sum = 0;
    for(auto it = numbers.begin(); it != numbers.end(); it++){
        sum += *it;
    }
    cout << "The sum is: " << sum << endl;
    return 0;
}

4. map：

#include <iostream>
#include <map>

using namespace std;

int main()
{
    map<string, int> numbers = {{"one", 1}, {"two", 2}, {"three", 3}, {"four", 4}, {"five", 5}};
    int sum = 0;
    for(auto it = numbers.begin(); it != numbers.end(); it++){
        sum += it->second;
    }
    cout << "The sum is: " << sum << endl;
    return 0;
}

以上示例中，我们使用了不同类型的容器来存储数值，并使用循环遍历容器中的元素进行求和。