题解 | #求路径#
求路径
http://www.nowcoder.com/practice/166eaff8439d4cd898e3ba933fbc6358
class Solution:
def uniquePaths(self , m , n ):
# write code here
dict = {}
for k in range(n):
dict[(0,k)] = 1
for v in range(m):
dict[(v, 0)] = 1
for i in range(1, m):
for j in range(1, n):
dict [(i,j)] = dict[(i-1, j)] + dict[(i, j-1)]
return dict[(m-1,n-1)] 