Create minimum-number-of-vertices-to-reach-all-nodes.cpp

Author: kamyu104

C++/minimum-number-of-vertices-to-reach-all-nodes.cpp

@@ -0,0 +1,19 @@
+// Time:  O(e)
+// Space: O(n)
+
+class Solution {
+public:
+    vector<int> findSmallestSetOfVertices(int n, vector<vector<int>>& edges) {
+        vector<int> result;
+        unordered_set<int> lookup;
+        for (const auto& e: edges) {
+            lookup.emplace(e[1]);
+        }
+        for (int i = 0; i < n; ++i) {
+            if (!lookup.count(i)) {
+                result.emplace_back(i);
+            }
+        }
+        return result;
+    }
+};