chore: solved medium day 7 task

Medium/Day7/Solution.cpp

@@ -1 +1,53 @@
 // Write Your code here--
+
+  #include<bits/stdc++.h>
+using namespace std;
+
+vector<vector<int>> adj;
+vector<bool> visited;
+
+int bfs(int start, int fuel) {
+    queue<pair<int, int>> q; // Queue to store current city and remaining fuel
+    q.push({start, fuel});
+    int cities_visited = 0;
+
+    while (!q.empty()) {
+        int city = q.front().first;
+        int remaining_fuel = q.front().second;
+        q.pop();
+
+        if (visited[city]) // Skip already visited cities
+            continue;
+
+        visited[city] = true;
+        cities_visited++;
+
+        for (int neighbor : adj[city]) {
+            if (!visited[neighbor] && remaining_fuel > 0) {
+                q.push({neighbor, remaining_fuel - 1});
+            }
+        }
+    }
+
+    return cities_visited;
+}
+
+int main() {
+    int n, m, fuel, start;
+    cin >> n >> m >> fuel >> start;
+
+    adj.resize(n + 1); // Indexing from 1
+    visited.resize(n + 1, false); // Initialize visited array
+
+    for (int i = 0; i < m; i++) {
+        int u, v;
+        cin >> u >> v;
+        adj[u].push_back(v);
+        adj[v].push_back(u);
+    }
+
+    int total_cities = bfs(start, fuel);
+    cout << total_cities << endl;
+
+    return 0;
+}