说明

算法提高&nbsp 复数求和&nbsp  
时间限制：1.0s&nbsp  &nbsp 内存限制：512.0MB
 &nbsp  &nbsp
从键盘读入n个复数（实部和虚部都为整数）用链表存储，遍历链表求出n个复数的和并输出。
样例输入:&nbsp
3&nbsp
3&nbsp 4
5&nbsp 2
1&nbsp 3
样例输出:
9+9i
样例输入:&nbsp
7
1&nbsp 2
3&nbsp 4
2&nbsp 5
1&nbsp 8
6&nbsp 4
7&nbsp 9
3&nbsp 7
样例输出:
23+39i