@@ -110,9 +110,44 @@ int[] GetMinimumSizeSubarraySum(int[] inputArray, int n)
110110 return null ;
111111 }
112112
113- List < string > GetSummaryRanges ( int [ ] inputArray )
113+ string [ ] GetSummaryRanges ( int [ ] inputArray )
114114 {
115- return null ;
115+ if ( inputArray == null || inputArray . Length == 0 )
116+ throw new ArgumentNullException ( "inputArray needs to have elements" ) ;
117+ 118+ var listOfAnswers = new List < string > ( ) ;
119+ 120+ for ( int index = 0 ; index < inputArray . Length ; index ++ )
121+ {
122+ var firstString = string . Empty ;
123+ bool found = false ;
124+ for ( int insideIndex = index ; insideIndex < inputArray . Length ; insideIndex ++ )
125+ {
126+ if ( insideIndex + 1 < inputArray . Length && ( inputArray [ insideIndex + 1 ] - inputArray [ insideIndex ] == 1 ) )
127+ {
128+ if ( ! found )
129+ {
130+ firstString = $ "{ inputArray [ insideIndex ] } ";
131+ }
132+ found = true ;
133+ }
134+ else
135+ {
136+ if ( found )
137+ {
138+ string endString = inputArray [ insideIndex ] . ToString ( ) ;
139+ listOfAnswers . Add ( $ "{ firstString } ->{ endString } ") ;
140+ index = insideIndex ;
141+ break ;
142+ }
143+ else
144+ {
145+ listOfAnswers . Add ( $ "{ inputArray [ insideIndex ] } ") ;
146+ }
147+ }
148+ }
149+ }
150+ return listOfAnswers . ToArray ( ) ;
116151 }
117152
118153 [ Test ]
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