|시간 제한||메모리 제한||제출||정답||맞은 사람||정답 비율|
|5 초||512 MB||57||35||30||62.500%|
You have a 2D rectangular grid. Each grid cell contains either an apple, an obstacle, or is empty. Empty cells are denoted as ’.’, apples as ’a’, and obstacles as ’#’. You are to implement a simulation of gravity, based on the following rules:
Print out the final configuration of the board after all apples reach their final locations. Merely iterating the gravity rule, a step at a time, will likely take too long on large datasets.
The input begins with a line containing integers R and C, designating the number of rows and columns of the grid, such that 1 ≤ R ≤ 50 000 and 1 ≤ C ≤ 10. The first line is followed by R additional lines, each designating a row of the grid, from top to bottom. Each line has C characters, each of which is either ’.’, ’a’, or ’#’.
Output R grid lines displaying the final state.
3 3 aaa #.. ..#
a.. #.a .a#
4 5 aaa.a aa.a. a.a.. ...a.
..... a.... aaaa. aaaaa