Trapping Rain Water leetcode Python 2016 new season
Givennnon-negativeintegersrepresentinganelevationmapwherethewidthofeachbaris1,computehowmuchwateritisabletotrapafterraining.Forexample,Given[0,1,0,2,1,0,1,3,2,1,2,1],return6.Theaboveelevationmapisrepr