Strange Grid

 def main():

     r,c = map(int, raw_input().split(' '))

     if r % 2 != 0:
         base = 5*(r-1)
     else:
         base = 5*(r-2) + 1 

     col = (c-1) * 2

     print base + col 

 main()

Link:

　　https://www.hackerrank.com/challenges/strange-grid/submissions/code/11668215

学习：

　　本质就是找各个纬度的逻辑关系