Create the-number-of-full-rounds-you-have-played.cpp

Author: kamyu104

C++/the-number-of-full-rounds-you-have-played.cpp

@@ -0,0 +1,32 @@
+// Time:  O(1)
+// Space: O(1)
+
+class Solution {
+public:
+    int numberOfRounds(string startTime, string finishTime) {
+        int start = stoi(startTime.substr(0, 2)) * 60 + stoi(startTime.substr(3));
+        int finish = stoi(finishTime.substr(0, 2)) * 60 + stoi(finishTime.substr(3));
+        if (start > finish) {
+            finish += 1440;
+        }
+        return max(finish / 15 - (start + 15 - 1) / 15, 0);
+    }
+};
+
+
+// Time:  O(1)
+// Space: O(1)
+class Solution2 {
+public:
+    int numberOfRounds(string startTime, string finishTime) {
+        int h1 = stoi(startTime.substr(0, 2));
+        int m1 = stoi(startTime.substr(3));
+        int h2 = stoi(finishTime.substr(0, 2));
+        int m2 = stoi(finishTime.substr(3));
+        if (m1 > m2) {
+            --h2;
+            m2 += 60;
+        }
+        return max((h2 - h1 + 24) % 24 * 4 + m2 / 15 - (m1 + 15 - 1) / 15, 0);
+    }
+};