feat: add cpp solution to lc problem: No.0332 (#1776)

Author: xzhseh

solution/0300-0399/0332.Reconstruct Itinerary/README.md

@@ -98,6 +98,44 @@ class Solution {
 }
 ```
 
+### **C++**
+
+```cpp
+class Solution {
+public:
+    vector<string> findItinerary(vector<vector<string>>& tickets) {
+        unordered_map<string, priority_queue<string, vector<string>, greater<string>>> g;
+        vector<string> ret;
+
+        // Initialize the graph
+        for (const auto& t : tickets) {
+            g[t[0]].push(t[1]);
+        }
+
+        findItineraryInner(g, ret, "JFK");
+
+        ret = {ret.rbegin(), ret.rend()};
+
+        return ret;
+    }
+
+    void findItineraryInner(unordered_map<string, priority_queue<string, vector<string>, greater<string>>>& g, vector<string>& ret, string cur) {
+        if (g.count(cur) == 0) {
+            // This is the end point
+            ret.push_back(cur);
+            return;
+        } else {
+            while (!g[cur].empty()) {
+                auto front = g[cur].top();
+                g[cur].pop();
+                findItineraryInner(g, ret, front);
+            }
+            ret.push_back(cur);
+        }
+    }
+};
+```
+
 ### **...**
 
 ```

solution/0300-0399/0332.Reconstruct Itinerary/README_EN.md

@@ -88,6 +88,44 @@ class Solution {
 }
 ```
 
+### **C++**
+
+```cpp
+class Solution {
+public:
+    vector<string> findItinerary(vector<vector<string>>& tickets) {
+        unordered_map<string, priority_queue<string, vector<string>, greater<string>>> g;
+        vector<string> ret;
+
+        // Initialize the graph
+        for (const auto& t : tickets) {
+            g[t[0]].push(t[1]);
+        }
+
+        findItineraryInner(g, ret, "JFK");
+
+        ret = {ret.rbegin(), ret.rend()};
+
+        return ret;
+    }
+
+    void findItineraryInner(unordered_map<string, priority_queue<string, vector<string>, greater<string>>>& g, vector<string>& ret, string cur) {
+        if (g.count(cur) == 0) {
+            // This is the end point
+            ret.push_back(cur);
+            return;
+        } else {
+            while (!g[cur].empty()) {
+                auto front = g[cur].top();
+                g[cur].pop();
+                findItineraryInner(g, ret, front);
+            }
+            ret.push_back(cur);
+        }
+    }
+};
+```
+
 ### **...**
 
 ```

solution/0300-0399/0332.Reconstruct Itinerary/Solution.cpp

@@ -0,0 +1,33 @@
+class Solution {
+public:
+    vector<string> findItinerary(vector<vector<string>>& tickets) {
+        unordered_map<string, priority_queue<string, vector<string>, greater<string>>> g;
+        vector<string> ret;
+
+        // Initialize the graph
+        for (const auto& t : tickets) {
+            g[t[0]].push(t[1]);
+        }
+
+        findItineraryInner(g, ret, "JFK");
+
+        ret = {ret.rbegin(), ret.rend()};
+
+        return ret;
+    }
+
+    void findItineraryInner(unordered_map<string, priority_queue<string, vector<string>, greater<string>>>& g, vector<string>& ret, string cur) {
+        if (g.count(cur) == 0) {
+            // This is the end point
+            ret.push_back(cur);
+            return;
+        } else {
+            while (!g[cur].empty()) {
+                auto front = g[cur].top();
+                g[cur].pop();
+                findItineraryInner(g, ret, front);
+            }
+            ret.push_back(cur);
+        }
+    }
+};