연구소3 파이썬 백준 17142
문제
input
첫째 줄에 연구소의 크기 N(4 ≤ N ≤ 50), 놓을 수 있는 바이러스의 개수 M(1 ≤ M ≤ 10)이 주어진다.
둘째 줄부터 N개의 줄에 연구소의 상태가 주어진다. 0은 빈 칸, 1은 벽, 2는 바이러스를 놓을 수 있는 위치이다. 2의 개수는 M보다 크거나 같고, 10보다 작거나 같은 자연수이다.
output
연구소의 모든 빈 칸에 바이러스가 있게 되는 최소 시간을 출력한다. 바이러스를 어떻게 놓아도 모든 빈 칸에 바이러스를 퍼뜨릴 수 없는 경우에는 -1을 출력한다.
TODO
바이러스 위치
연구소의 빈공간 개수 #나중에 다 해치웟는지 확인하기 위함
바이러스 중 m개 뽑기 -> combination
전파시키기 -> bfs
answer = 가장 빠르게 전파시킨 시간
CODE
import sys
from collections import deque
def input_data() :
n,m = map(int,sys.stdin.readline().split())
lab = [list(map(int,sys.stdin.readline().split())) for _ in range(n)]
virus = deque()
len_virus = 0
empty_cnt = 0
for i in range(n) :
for j in range(n):
if lab[i][j] == 2 :
virus.append((i,j,0))
len_virus +=1
elif lab[i][j] == 0 :
empty_cnt+=1
return n,m,lab,virus,len_virus,empty_cnt
def make_combination(index,cnt,m,combination,len_virus,temp_save,virus):
if cnt == m :
temp = deque()
for temp_s in temp_save :
temp.append(temp_s)
combination.append(temp)
for i in range(len_virus) :
if i <= index :
continue
temp_save.append(virus[i])
make_combination(i,cnt+1,m,combination,len_virus,temp_save,virus)
temp_save.pop()
return combination
def diffusion(vi,time_limit):
dx = [0,0,-1,1]
dy = [-1,1,0,0]
c = [[False for _ in range(n)] for _ in range(n)]
cnt = 0
while vi :
x,y,t = vi.popleft()
if time_limit <= t :
return float("inf")
c[x][y] = True
for px,py in zip(dx,dy):
nx,ny = x+px, y+py
if 0<=nx<n and 0<=ny<n and not c[nx][ny] and lab[nx][ny] != 1 :
if lab[nx][ny] == 0:
cnt+=1
c[nx][ny] = True
vi.append((nx,ny,t+1))
if cnt == empty_cnt :
return t+1
return float('inf')
if __name__ == "__main__":
t=float('inf')
n,m,lab,virus,len_virus,empty_cnt = input_data()
if not empty_cnt :
t=0
combination = make_combination(-1,0,m,deque(),len_virus,deque(),virus)
while combination :
vi = combination.popleft()
t = min(t,diffusion(vi,t))
if t == float('inf'):
t=-1
print(t)회고
미치는줄 알았다.
처음 생각한 방법은 모든 바이러스가 1초뒤 전파되는걸 저장하고 조합을 구해서 연구소에 0이 없으면 끝내고, 모든 바이러스가 다 퍼진 경우를 세기위한 배열을 만든다음 계산해서 배열 내에 변화가 없고, 0이 존재하면 -1을 출력하는 방법으로 진행했다.
시간초과가 나오길래 코드를 조금씩 수정하고 dict도 쓰고 초기화 되던거 꾸역꾸역 다시 사용하고.. 했지만 결국 70%에서 시간초과를 넘길 수 없었다.
가장 오래 걸릴것이라 예상되는 예제도 직접 만들어가며 테스트했다. 하도 안돼서 처음부터 다시 구현했고 이게 더 빠를까 싶었던걸로 구현해봤더니 훨씬 빨랐다. 속상하네..
예제
3 1
0 1 1
1 1 1
1 1 2
-1
5 1
2 0 0 0 0
1 1 1 1 0
0 0 0 0 0
0 1 1 1 1
0 0 0 0 0
16
5 2
2 0 0 0 0
1 1 1 1 0
0 0 0 0 0
0 1 1 1 1
0 0 0 0 2
8
3 1
0 1 1
1 1 1
1 0 2
-1
7 3
2 0 2 0 1 1 0
0 0 1 0 1 0 0
0 1 1 1 1 0 0
2 1 0 0 0 0 2
1 0 0 0 0 1 1
0 1 0 0 0 0 0
2 1 0 0 2 0 2
7
50 1
2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
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0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0
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0 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 1 0 1 0 1 0
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0 1 0 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 1 0
0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0
0 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0
0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
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1298
50 1
2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
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1274
50 4
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-1
Author And Source
이 문제에 관하여(연구소3 파이썬 백준 17142), 우리는 이곳에서 더 많은 자료를 발견하고 링크를 클릭하여 보았다 https://velog.io/@ifelifelse/연구소3-파이썬-백준-17142저자 귀속: 원작자 정보가 원작자 URL에 포함되어 있으며 저작권은 원작자 소유입니다.
우수한 개발자 콘텐츠 발견에 전념
(Collection and Share based on the CC Protocol.)
좋은 웹페이지 즐겨찾기
