题目：
题解：
class Solution:def calculateMinimumHP(self, dungeon: List[List[int]]) -> int:n, m = len(dungeon), len(dungeon[0])BIG = 10**9dp = [[BIG] * (m + 1) for _ in range(n + 1)]dp[n][m - 1] = dp[n - 1][m] = 1for i in range(n - 1, -1, -1):for j in range(m - 1, -1, -1):minn = min(dp[i + 1][j], dp[i][j + 1])dp[i][j] = max(minn - dungeon[i][j], 1)return dp[0][0]
