【迷宫】2019CB-E-迷宫(同为A组D题)

ditu=[
    '1111111111111111111111111111111111111111111111111111',
    '1010101010010110010010101100101101001000010001010101',
    '1000010001000001010100100001000000010011001101001011',
    '1011110110100100010000011010010111000110000000100001',
    '1010000000010101000110100001010000010101010110010111',
    '1000111110000001010000100101000101000001011000000001',
    '1110010001101010000101011000110100110101010111101111',
    '1000110110101010010010010100000010001010011100000001',
    '1101000001010001001101010101111100110000100001110101',
    '1001110000010101000011000100000010001010011000010011',
    '1110001101000011100100010010101010101010100011010001',
    '1000100001001000001010010101011101000101010100001011',
    '1111001001010010010000100000101010101001001000101001',
    '1000000100000001010110011110100011000001010101000111',
    '1101010100111000010000110000101100111101101000010001',
    '1101010101000011010101001010000101000001110111010011',
    '1100000001011000100001011001011010010111000000001001',
    '1101010010000000101001000010001000001000111101010011',
    '1001010010101011010010101000110101011011100001101011',
    '1110010100001000011000000101001010000010001110000101',
    '1000010001100001101011010000001001010010010000111011',
    '1101001010001010000000011101100101101011010101000011',
    '1001010000100001101010100001000100010010001000101011',
    '1101000010001100100010000101010010101010111110100101',
    '1000001001010000001100101001010010000010000000000101',
    '1110100000010011101110010010000111010010110111010001',
    '1000001101000100010001000000010000111010000001100111',
    '1101010001010001000100011111000101010010100000010001',
    '1100000101001010010101100000001001010100010111010001',
    '1001111000010000100000001101110000000010000000010111',
    '1100000011001110101110100010001101110101011011110001',
    '1111111111111111111111111111111111111111111111111111'
]
start=(1,1)
end=(30,50)
queue=[[start]]
zouguo=[start]
def bfs(queue):
    if end in queue[-1]:
        return queue
    nows=[]
    for now in queue[-1]:
        hang,lie=now
        if ditu[hang+1][lie]=='0' and ((hang+1,lie) not in zouguo):
            nows.append((hang+1,lie))
            zouguo.append((hang+1,lie))
        if ditu[hang][lie-1]=='0' and ((hang,lie-1) not in zouguo):
            nows.append((hang,lie-1))
            zouguo.append((hang,lie-1))
        if ditu[hang][lie+1]=='0' and ((hang,lie+1) not in zouguo):
            nows.append((hang,lie+1))
            zouguo.append((hang,lie+1))
        if ditu[hang-1][lie]=='0' and ((hang-1,lie) not in zouguo):
            nows.append((hang-1,lie))
            zouguo.append((hang-1,lie))
    queue.append(nows)
    return bfs(queue)
queue=bfs(queue)
zouguo2=[start]
stack=[start]
while stack[-1] != end:
    hang,lie=stack[-1]
    keneng=queue[len(stack)]
    if (hang+1,lie) in keneng and (hang+1,lie) not in zouguo2:
        stack.append((hang+1,lie))
        zouguo2.append((hang+1,lie))
        continue
    elif (hang,lie-1) in keneng and (hang,lie-1) not in zouguo2:
        stack.append((hang,lie-1))
        zouguo2.append((hang,lie-1))
        continue
    elif (hang,lie+1) in keneng and (hang,lie+1) not in zouguo2:
        stack.append((hang,lie+1))
        zouguo2.append((hang,lie+1))
        continue
    elif (hang-1,lie) in keneng and (hang-1,lie) not in zouguo2:
        stack.append((hang-1,lie))
        zouguo2.append((hang-1,lie))
        continue
    else:stack.pop()
txt=''
for i in range(len(stack)-1):
    if stack[i+1][0]>stack[i][0]:
        txt+='D'
    elif stack[i+1][0]<stack[i][0]:
        txt+='U'
    if stack[i+1][1]>stack[i][1]:
        txt+='R'
    if stack[i+1][1]<stack[i][1]:
        txt+='L'
print(txt)