Simple C# Solution
\n    public class Solution\n    {\n        public string DestCity(IList<IList<string>> paths)\n        {\n            ISet<string> fromSet = new HashSet<string
```\n    public class Solution\n    {\n        public string DestCity(IList<IList<string>> paths)\n        {\n            ISet<string> fromSet = new HashSet<string>();\n            foreach (var p in paths)\n            {\n                fromSet.Add(p[0]);\n            }\n\n            foreach (var p in paths)\n            {\n                if (!fromSet.Contains(p[1]))\n                {\n                    return p[1];\n                }\n            }\n\n            return "";\n        }\n    }\n```
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