关于“+”,如何处理'NoneType' and 'float'
def minPathCost_Memo(cost, i, j, memo):
# 请在下面编写代码
if not (memo[i][j]==0):
return memo[i][j]
if (i==0) and (j==0):
memo[i][j]=cost[0][0]
elif i==0 and j>0:
memo[i][j]=minPathCost_Memo(cost,i,j-1,memo)+float(cost[0][j])
elif j==0 and i>0:
memo[i][j]=minPathCost_Memo(cost,i-1,j,memo)+float(cost[i][0])
elif j>0 and i>0:
x=minPathCost_Memo(cost,i-1,j,memo)
y=minPathCost_Memo(cost,i,j-1,memo)
memo[i][j]=min(x,y)+float(cost[i][j])
return memo[i][j]
# 请不要修改下面的代码
TypeError: unsupported operand type(s) for +: 'NoneType' and 'float'