Editorial for Moving Ball
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Author:kahootist
Editorial
Notice how only the edges of the grid matter when determining whether a ball will go out of bounds or not. Therefore, we only have to check all cells at an edge and determine whether it'll lead the balls out of bounds or not.
Implementation
n, m = map(int, input())
grid = [input().split() for _ in range(n)]
changes = 0
for j in range(m):
if grid[0][j] == 'U':
changes += 1
if grid[n-1][j] == 'D':
changes += 1
for i in range(n):
if grid[i][0] == 'L':
changes += 1
if grid[i][m-1] == 'R':
changes += 1
print(changes)
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