Create 2045. Second Minimum Time to Reach Destination (#540)

Author: Chayandas07

2045. Second Minimum Time to Reach Destination

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+class Solution {
+public:
+    int secondMinimum(int n, vector<vector<int>>& edges, int time, int change) {
+        vector<vector<int>>adj(n+1);
+        for(auto it : edges) {
+            adj[it[0]].push_back(it[1]);
+            adj[it[1]].push_back(it[0]);
+        }
+        vector<int>mn(n+1,1e9), smn(n+1,1e4);
+
+        queue<pair<int,int>>q;
+        mn[1] = 0;
+        q.push({1,0});
+        while(q.size()){
+            int node = q.front().first;
+            int wt = q.front().second;
+            q.pop();
+            for(auto it : adj[node]){
+                if(mn[it] > wt+1){
+                    mn[it] = wt+1;
+                    q.push({it, wt+1});
+                }
+                
+            }
+        }
+        q.push({1,0});
+        while(q.size()){
+            int node = q.front().first;
+            int wt = q.front().second;
+            q.pop();
+            for(auto it : adj[node]){
+               
+                if(wt+1>mn[it] && wt+1<smn[it]){
+                    smn[it] = wt+1;
+                    q.push({it, wt+1});
+                
+                }
+                else if(wt+1 == mn[it]) q.push({it, wt+1});
+                
+            }
+        }
+        int ans = 0;
+        while(smn[n]--){
+            ans += time;
+            cout<<ans<<" ";
+            if((ans / change)%2 && smn[n]){
+                ans += (change - ans%change);
+                cout<<ans<<" , ";
+            }
+        }
+        return ans;
+    }
+};