@@ -56,13 +56,65 @@ Clearly the destination city is "A".
5656### ** Python3**
5757
5858``` python
59- 59+ class Solution :
60+ def destCity (self paths : List[List[str ]]) -> str :
61+ mp = {a: b for a, b in paths}
62+ a = paths[0 ][0 ]
63+ while mp.get(a):
64+ a = mp[a]
65+ return a
6066```
6167
6268### ** Java**
6369
6470``` java
71+ class Solution {
72+ public String destCity (List<List<String > > paths ) {
73+ Map<String , String > mp = new HashMap<> ();
74+ for (List<String > path : paths) {
75+ mp. put(path. get(0 ), path. get(1 ));
76+ }
77+ String a = paths. get(0 ). get(0 );
78+ while (mp. get(a) != null ) {
79+ a = mp. get(a);
80+ }
81+ return a;
82+ }
83+ }
84+ ```
85+ 86+ ### ** C++**
87+ 88+ ``` cpp
89+ class Solution {
90+ public:
91+ string destCity(vector<vector<string >>& paths) {
92+ unordered_map<string, string> mp;
93+ for (auto& path : paths) mp[ path[ 0]] = path[ 1] ;
94+ string a = paths[ 0] [ 0 ] ;
95+ while (mp.find(a) != mp.end()) a = mp[ a] ;
96+ return a;
97+ }
98+ };
99+ ```
65100
101+ ### **Go**
102+
103+ ```go
104+ func destCity(paths [][]string) string {
105+ mp := make(map[string]string)
106+ for _, path := range paths {
107+ mp[path[0]] = path[1]
108+ }
109+ a := paths[0][0]
110+ for true {
111+ if _, ok := mp[a]; !ok {
112+ return a
113+ }
114+ a = mp[a]
115+ }
116+ return ""
117+ }
66118```
67119
68120### ** ...**
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