C++中对vector所有元素求和
#include <iostream>
#include <vector>
#include <numeric>
using namespace std;
template<typename T>
T SumVector(vector<T>& vec)
{
T res = 0;
for (size_t i=0; i<vec.size(); i++)
{
res += vec[i];
}
return res;
}
int main()
{
vector<int> v = { 1, 2, 3, 4, 5 };
cout << "sum1: " << SumVector(v) << endl;
cout << "sum2: " << accumulate(v.begin(), v.end(), 0) << endl;
cout << "sum3: " << accumulate(v.begin(), v.end(), 5) << endl;
return 0;
}