CodingTest/Softeer

[softeer] 소프티어(파이썬): 동계 테스트 시점 예측★★★

JunJangE 2021. 9. 24. 12:22

문제

 

Softeer

제한시간 : C/C++(1초), Java/Python(2초) | 메모리 제한 : 128MB 입력형식 첫째 줄에는 격자 화면의 크기를 나타내는 두 개의 정수 N, M (5 ≤ N, M ≤ 100)이 주어진다. 그 다음 N개의 줄에는 격자 화면 위에

softeer.ai

알고리즘

- bfs 탐색을 통해 문제를 수행한다.

- 상/하/좌/우를 탐색하고 탐색하는 곳이 얼음이면 방문 여부를 카운트한다.

- 얼음이 아니고 탐색하지 않은 곳이라면 탐색한다.

- 모든 공간을 한 번씩 탐색했다면 2번 탐색한 얼음을 녹여준다.

- 위 과정을 모든 얼음이 녹을 때까지 반복해준다.

코드

import sys
from collections import deque


# bfs 탐색
def bfs():
    dx = [1, -1, 0, 0]
    dy = [0, 0, 1, -1]
    queue = deque([[0, 0]])
    visited[0][0] = 1

    while queue:
        a, b = queue.popleft()

        # 상/하/좌/우 탐색
        for i in range(4):
            x = a + dx[i]
            y = b + dy[i]
    
            if 0 <= x < n and 0 <= y < m:
                # 탐색하는 곳이 얼음이면 방문 여부 카운트
                if graph[x][y] == 1:
                    visited[x][y] += 1

                # 얼음이 아니고 탐색하지 않았다면 탐색
                elif visited[x][y] == 0:
                    queue.append([x, y])
                    visited[x][y] = 1

    # 한시간이 지나면 얼음을 2번 이상 방문한 곳을 녹인다.
    for i in range(n):
        for j in range(m):
            if visited[i][j] >= 2:
                graph[i][j] = 0


n, m = map(int, sys.stdin.readline().split())
graph = [list(map(int, sys.stdin.readline().split())) for _ in range(n)]
cnt = 0

# 모든 얼음이 녹을 때까지 반복한다.
while True:
    # 모든 얼음이 녹았다면 반복을 멈춘다.
    if graph.count(graph[0]) == n:
        break
    
    visited = [[0] * m for _ in range(n)] # 탐색 여부
    bfs() # bfs 탐색
    cnt += 1 # 시간 카운트

# 시간을 출력
print(cnt)

 

실패한 코드..

import sys
from collections import deque


def bfs():
    dx = [1, -1, 0, 0]
    dy = [0, 0, 1, -1]
    queue = deque([[0, 0]])
    visited[0][0] = 1

    while queue:
        # print(visited)
        a, b = queue.popleft()

        for i in range(4):
            x = a + dx[i]
            y = b + dy[i]

            if 0 <= x < n and 0 <= y < m:
                # 탐색하는 곳이 얼음이면 방문 여부 카운트
                if graph[x][y] == 1:
                    visited[x][y] += 1

                # 얼음이 아니고 탐색하지 않았다면 탐색
                elif visited[x][y] == 0:
                    queue.append([x, y])
                    visited[x][y] = 1

    # 한시간이 지나면 얼음을 2번 이상 방문한 곳을 녹인다.
    for i in range(n):
        for j in range(m):
            if visited[i][j] >= 2:
                graph[i][j] = 0


n, m = map(int, sys.stdin.readline().split())
graph = [list(map(int, sys.stdin.readline().split())) for _ in range(n)]
cnt = 0

while True:
    visited = [[0] * m for _ in range(n)]
    bfs()
    cnt += 1
    if graph.count(graph[0]) == n:
        break

print(cnt)

테스트 케이스랑 다른 여러 테스트 케이스를 실행을 해도 잘 실행되는 거 같은데 어디서 잘못된 건지 찾기가 너무 힘든 것 같다.. 혹시나 힌트나 반례를 주실 수 있으시다면 댓글 달아주세요!

21.10.31 --->  테스트 케이스에서 얼음이 없는 경우를 생각하지 못해서 틀렸다. 위 코드에서 얼음의 유무를 확인하기전에 cnt를 카운트했기 때문에 얼음이 없는 경우에도 카운트된 것이다. 간단한 문제였는데, 좀 더 집중해서 문제를 풀어야 할 것 같다.

테스트 케이스

100 100
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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 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 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 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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4 4
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GitHub - junjange/CodingTest: 내가 푼 코딩 테스트 문제와 해결법

내가 푼 코딩 테스트 문제와 해결법. Contribute to junjange/CodingTest development by creating an account on GitHub.

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