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| '''
Author: NEFU AB-IN
Date: 2024-08-26 21:33:53
FilePath: \LeetCode\42\42.py
LastEditTime: 2024-08-27 21:01:52
'''
import random
from collections import Counter, defaultdict, deque
from datetime import datetime, timedelta
from functools import lru_cache, reduce
from heapq import heapify, heappop, heappush, nlargest, nsmallest
from itertools import combinations, compress, permutations, starmap, tee
from math import ceil, comb, fabs, floor, gcd, hypot, log, perm, sqrt
from string import ascii_lowercase, ascii_uppercase
from sys import exit, setrecursionlimit, stdin
from typing import Any, Callable, Dict, List, Optional, Tuple, TypeVar, Union
TYPE = TypeVar('TYPE')
N = int(2e5 + 10)
M = int(20)
INF = int(1e12)
OFFSET = int(100)
MOD = int(1e9 + 7)
setrecursionlimit(int(2e9))
class Arr:
array = staticmethod(lambda x=0, size=N: [x() if callable(x) else x for _ in range(size)])
array2d = staticmethod(lambda x=0, rows=N, cols=M: [Arr.array(x, cols) for _ in range(rows)])
graph = staticmethod(lambda size=N: [[] for _ in range(size)])
class Math:
max = staticmethod(lambda a, b: a if a > b else b)
min = staticmethod(lambda a, b: a if a < b else b)
class Std:
pass
class Solution:
def trap(self, heights: List[int]) -> int:
ans = 0
stack_ = []
for right, h in enumerate(heights):
while stack_ and h > heights[stack_[-1]]:
mid = heights[stack_.pop()]
if not stack_:
break
left = stack_[-1]
ans += (Math.min(heights[left], h) - mid) * (right - left - 1)
stack_.append(right)
return ans
|