How python [internally] retrieves elements from array and finds minimum -


for question http://www.spoj.com/problems/acpc10d/ on spoj, wrote python solution below:

count = 1 while true:     no_rows = int(raw_input())      if no_rows == 0:         break      grid = [[none x in range(3)] y in range(2)]      input_arr = map(int, raw_input().split())      grid[0][0] = 10000000     grid[0][1] = input_arr[1]     grid[0][2] = input_arr[1] + input_arr[2]      r = 1     in range(0, no_rows-1):         input_arr = map(int, raw_input().split())         _r = r ^ 1         grid[r][0] = input_arr[0] + min(grid[_r][0], grid[_r][1])         grid[r][1] = input_arr[1] + min(min(grid[_r][0], grid[r][0]), min(grid[_r][1], grid[_r][2]))         grid[r][2] = input_arr[2] + min(min(grid[_r][1], grid[r][1]), grid[_r][2])           r = _r          print str(count) + ". " + str(grid[(no_rows -1) & 1][1])          count += 1

the above code exceeds time limit. however, when change line

grid[r][2] = input_arr[2] + min(min(grid[_r][1], grid[r][1]), grid[_r][2])

to 

grid[r][2] = input_arr[2] + min(min(grid[_r][1], grid[_r][2]), grid[r][1])

the solution accepted. if notice difference, first line compares, grid[_r][1], grid[r][1] minimum (i.e. row number different) , second line compares grid[_r][1], grid[_r][2] minimum(i.e. row number same)

this consistent behaviour. want understand, how python processing 2 lines - 1 results in exceeding time limit, while other fine.


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