3342. Find Minimum Time to Reach Last Room II.cpp

3342. Find Minimum Time to Reach Last Room II.cpp

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+class Solution {
+public:
+    vector<vector<int>>directions{{1,0},{-1,0},{0,1},{0,-1}};
+    typedef pair<int,pair<int,int>>P;
+    int minTimeToReach(vector<vector<int>>& moveTime) {
+        int m=moveTime.size(),n=moveTime[0].size();
+
+        priority_queue<P,vector<P>,greater<P>>pq;
+        vector<vector<int>>result(m,vector<int>(n,INT_MAX));
+
+        result[0][0]=0;
+        pq.push({0,{0,0}});
+
+        while(!pq.empty()){
+            int currTime=pq.top().first;
+            auto cell=pq.top().second;
+
+            int i=cell.first;
+            int j=cell.second;
+
+            pq.pop();
+            if(i==m-1 && j==n-1) return currTime;
+
+            for(auto &dir:directions){
+                int i_=i+dir[0];
+                int j_=j+dir[1];
+
+                if(i_>=0 && i_<m && j_>=0 && j_<n){
+                    int moveCost=(i_+j_)%2==0?2:1;
+                    int wait=max(moveTime[i_][j_]-currTime,0);
+                    int arrTime=currTime+wait+moveCost;
+
+                    if(result[i_][j_]>arrTime){
+                        result[i_][j_]=arrTime;
+                        pq.push({arrTime,{i_,j_}});
+                    }
+                }
+            }
+        }
+        return -1;
+    }
+};