常用算术生成算法

accumulate

• accumulate(iterator beg, iterator end, value);
• value: 起始累加值

title:Important
collapse:open

#include <iostream>
#include <numeric>
using namespace std;
 
void print(vector<int>& v)
{
    for(vector<int>::iterator it = v.begin(); it != v.end(); it++)
    {
        cout << *it << " ";
    }
    cout << endl;
}
 
int main()
{
   vector<int>v1;
    
    for(int i = 0; i < 10; i++)
    {
        v1.push_back(i);
    }
    print(v1);
    int total = accumulate(v1.begin(), v1.end(), 0);
    cout << total << endl;
    return 0;
}
/*output:
0 1 2 3 4 5 6 7 8 9
55
 
*/

fill

• fill(iterator beg, iterator end, value);

title:Example
collapse:open

#include <iostream>
#include <numeric>
using namespace std;
 
void print(vector<int>& v)
{
    for(vector<int>::iterator it = v.begin(); it != v.end(); it++)
    {
        cout << *it << " ";
    }
    cout << endl;
}
 
int main()
{
   vector<int>v1;
    
    v1.resize(10);
    fill(v1.begin(), v1.end(), 100);
    print(v1);
    return 0;
}
/*output:
100 100 100 100 100 100 100 100 100 100 
 
*/