2021.11.3 接雨水
作者:互联网
class Solution:
def trapRainWater(self, heightMap: List[List[int]]) -> int:
if len(heightMap) <= 2 or len(heightMap[0]) <= 2:
return 0
m, n = len(heightMap), len(heightMap[0])
visited = [[0 for _ in range(n)] for _ in range(m)]
pq = []
for i in range(m):
for j in range(n):
if i == 0 or i == m - 1 or j == 0 or j == n - 1:
visited[i][j] = 1
heapq.heappush(pq, (heightMap[i][j], i * n + j))
res = 0
dirs = [-1, 0, 1, 0, -1]
while pq:
height, position = heapq.heappop(pq)
for k in range(4):
nx, ny = position // n + dirs[k], position % n + dirs[k + 1]
if nx >= 0 and nx < m and ny >= 0 and ny < n and visited[nx][ny] == 0:
if height > heightMap[nx][ny]:
res += height - heightMap[nx][ny]
visited[nx][ny] = 1
heapq.heappush(pq, (max(height, heightMap[nx][ny]), nx * n + ny))
return res
标签:heightMap,pq,2021.11,雨水,height,nx,ny,range 来源: https://blog.csdn.net/q535030343/article/details/121132297