11using NUnit . Framework ;
2+ using System ;
23using System . Collections . Generic ;
34using System . Linq ;
45
@@ -66,6 +67,24 @@ int[] MoveZeros(int[] arrayOfNumbers)
6667 return listOfElements . ToArray ( ) ;
6768 }
6869
70+ int GetTrappingRainWater ( int [ ] elevationMap )
71+ {
72+ if ( elevationMap == null || elevationMap . Length == 0 )
73+ return 0 ;
74+ int waterToDrop = 0 ;
75+ int level = 0 ;
76+ int left = 0 ;
77+ int right = elevationMap . Length - 1 ;
78+ while ( left < right )
79+ {
80+ int lower = elevationMap [ elevationMap [ left ] < elevationMap [ right ] ? left ++ : right -- ] ;
81+ level = Math . Max ( lower , level ) ;
82+ waterToDrop += level - lower ;
83+ Console . WriteLine ( $ "left{ left } right{ right } lower { lower } level { level } waterToDrop { waterToDrop } ") ;
84+ }
85+ return waterToDrop ;
86+ }
87+ 6988 [ Test ]
7089 public void RemoveDuplicatesFromSortedArray_1 ( )
7190 {
@@ -110,5 +129,16 @@ public void MoveZeros_4()
110129
111130 Assert . AreEqual ( expectedArrayWithZerosInTheEnd , arrayWithRemoveElement ) ;
112131 }
132+ 133+ [ Test ]
134+ public void TrappingRainWater_6 ( )
135+ {
136+ var elevationMap = new int [ ] { 0 , 1 , 0 , 2 , 1 , 0 , 1 , 3 , 2 , 1 , 2 , 1 } ;
137+ var expectedValue = 6 ;
138+ 139+ var rainWaterValue = GetTrappingRainWater ( elevationMap ) ;
140+ 141+ Assert . AreEqual ( expectedValue , rainWaterValue ) ;
142+ }
113143 }
114144}
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