示例代码：

#include <bits/stdc++.h>
using namespace std;
int a[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int main() {
    partial_sum(a, a+11, a);
    // a已经变为了原来的a的前缀和了
    for (int i = 0; i <= 10; i ++)
        cout << a[i] << endl;
    return 0;
}