Create maximum-building-height.cpp

Author: kamyu104

C++/maximum-building-height.cpp

@@ -0,0 +1,22 @@
+// Time:  O(nlogn)
+// Space: O(1)
+
+class Solution {
+public:
+    int maxBuilding(int n, vector<vector<int>>& restrictions) {
+        restrictions.push_back({1, 0});
+        restrictions.push_back({n, n - 1});
+        sort(begin(restrictions), end(restrictions));
+        for (int i = size(restrictions) - 2; i >= 0; --i) {
+            restrictions[i][1] = min(restrictions[i][1], restrictions[i + 1][1] + (restrictions[i + 1][0] - restrictions[i][0]));
+        }
+        int result = 0;
+        for (int i = 1; i < size(restrictions); ++i) {
+            restrictions[i][1] = min(restrictions[i][1], restrictions[i - 1][1] + (restrictions[i][0] - restrictions[i - 1][0]));
+            int left = restrictions[i - 1][0], h1 = restrictions[i - 1][1];
+            int right = restrictions[i][0], h2 = restrictions[i][1];
+            result = max(result, max(h1, h2) + ((right - left) - abs(h1 - h2)) / 2);
+        }
+        return result;
+    }
+};