Create minimum-number-of-refueling-stops.cpp

Author: kamyu104

C++/minimum-number-of-refueling-stops.cpp

@@ -0,0 +1,25 @@
+// Time:  O(nlogn)
+// Space: O(n)
+
+class Solution {
+public:
+    int minRefuelStops(int target, int startFuel, vector<vector<int>>& stations) {
+        priority_queue<int> max_heap;
+        stations.push_back(vector<int>{target, numeric_limits<int>::min()});
+
+        int result = 0, prev = 0;
+        for (const auto& station : stations) {
+            startFuel -= station[0] - prev;
+            while (!max_heap.empty() && startFuel < 0) {
+                startFuel += max_heap.top(); max_heap.pop();
+                ++result;
+            }
+            if (startFuel < 0) {
+                return -1;
+            }
+            max_heap.emplace(station[1]);
+            prev = station[0];
+        }
+        return result;
+    }
+};