Create The Number of Full Rounds You Have Played.java

varunu28 · web-flow · commit 81a563b08772 · 2021-06-20T13:23:09.000-07:00
diff --git a/Medium/The Number of Full Rounds You Have Played.java b/Medium/The Number of Full Rounds You Have Played.java
@@ -0,0 +1,24 @@
+class Solution {
+  public int numberOfRounds(String startTime, String finishTime) {
+    int startMinutes = toMinutes(startTime);
+    int finishMinutes = toMinutes(finishTime);
+    int roundedStart = toNextQuarter(startMinutes);
+    int roundedFinish = toPreviousQuarter(finishMinutes);
+    if (startMinutes < finishMinutes) {
+      return Math.max(0, (roundedFinish - roundedStart) / 15);
+    }
+    return (24 * 60 - roundedStart + roundedFinish) / 15;
+  }
+
+  public static int toMinutes(String s) {
+    return Integer.parseInt(s.substring(0, 2)) * 60 + Integer.parseInt(s.substring(3, 5));
+  }
+
+  public static int toNextQuarter(int time) {
+    return ((time + 14) / 15) * 15;
+  }
+
+  public static int toPreviousQuarter(int time) {
+    return (time / 15) * 15;
+  }
+}
