1+
2+ internal class Program
3+ {
4+ private static string _GetRange ( int first , int last )
5+ {
6+ return ( Convert . ToInt32 ( first ) != last ) ? $ "{ first } ->{ last } ": $ "{ first } ";
7+ }
8+ 9+ public static IList < string > SummaryRanges ( int [ ] nums )
10+ {
11+ if ( nums == null || nums . Length == 0 )
12+ {
13+ return [ ] ;
14+ }
15+ 16+ IList < string > result = new List < string > ( ) ;
17+ string firstItemInRange = string . Empty ;
18+ 19+ for ( int i = 0 ; i < nums . Length ; i ++ )
20+ {
21+ if ( string . IsNullOrWhiteSpace ( firstItemInRange ) )
22+ {
23+ firstItemInRange = $ "{ nums [ i ] } ";
24+ }
25+ 26+ if ( nums [ i ] < int . MaxValue && nums . Contains ( nums [ i ] + 1 ) )
27+ {
28+ continue ;
29+ }
30+ 31+ string range = _GetRange ( Convert . ToInt32 ( firstItemInRange ) , nums [ i ] ) ;
32+ 33+ result . Add ( range ) ;
34+ firstItemInRange = string . Empty ;
35+ }
36+ 37+ return result ;
38+ }
39+ 40+ private static void Main ( string [ ] args )
41+ {
42+ int [ ] nums = [ - 2147483648 , - 2147483647 , 2147483647 ] ;
43+ 44+ Console . WriteLine ( string . Join ( ',' , SummaryRanges ( nums ) ) ) ;
45+ 46+ Console . ReadKey ( ) ;
47+ }
48+ }
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