Huawei trial evaluation level

/* Calculate 1! + 2! + ...... + N !. Given n, the function name is also given. You only need to add the function body part. The final result is output in float format, and the format output is e % or something. An example of the output is provided: 3, the output is 3.20.00e + 000 */# include <iostream> # include <vector> using namespace std; float f (int n) {int I; int r; r = 1; int rr; rr = 0; for (I = 1; I <n + 1; I ++) {r * = I; rr + = r;} return (float) rr;} int main (void) {int n; vector <float> v; while (cin> n) {float r = f (n); v. push_back (r);} int I; for (I = 0; I <n; I ++) {printf ("% e \ n", v [I]);} return 0 ;}