add 1904

fishercoder1534 · fishercoder1534 · commit e99f831287b3 · 2021-06-20T15:30:12.000-07:00
diff --git a/README.md b/README.md
@@ -8,6 +8,7 @@ _If you like this project, please leave me a star._ &#9733;
 
 |  #  |      Title     |   Solutions   | Video  | Difficulty  | Tag                   
 |-----|----------------|---------------|--------|-------------|-------------
+|1904|[The Number of Full Rounds You Have Played](https://leetcode.com/problems/the-number-of-full-rounds-you-have-played/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1904.java) ||Medium|String, Greedy|
 |1903|[Largest Odd Number in String](https://leetcode.com/problems/largest-odd-number-in-string/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1903.java) ||Easy|Greedy|
 |1897|[Redistribute Characters to Make All Strings Equal](https://leetcode.com/problems/redistribute-characters-to-make-all-strings-equal/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1897.java) ||Easy|String, Greedy|
 |1886|[Determine Whether Matrix Can Be Obtained By Rotation](https://leetcode.com/problems/determine-whether-matrix-can-be-obtained-by-rotation/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1886.java) ||Easy|Array|
diff --git a/src/main/java/com/fishercoder/solutions/_1904.java b/src/main/java/com/fishercoder/solutions/_1904.java
@@ -0,0 +1,54 @@
+package com.fishercoder.solutions;
+
+public class _1904 {
+    public static class Solution1 {
+        public int numberOfRounds(String startTime, String finishTime) {
+            int rounds = 0;
+            int startHour = Integer.parseInt(startTime.split(":")[0]);
+            int endHour = Integer.parseInt(finishTime.split(":")[0]);
+            int startMin = Integer.parseInt(startTime.split(":")[1]);
+            int endMin = Integer.parseInt(finishTime.split(":")[1]);
+            if (endHour < startHour) {
+                endHour += 24;
+            } else if (endHour == startHour && endMin < startMin) {
+                endHour += 24;
+            }
+            if (startHour == endHour) {
+                if (startMin == 0 && endMin >= 15) {
+                    rounds++;
+                }
+                if (startMin <= 15 && endMin >= 30) {
+                    rounds++;
+                }
+                if (startMin <= 30 && endMin >= 45) {
+                    rounds++;
+                }
+                return rounds;
+            } else {
+                //compute all full rounds in the start hour
+                if (startMin == 0) {
+                    rounds += 4;
+                } else if (startMin <= 15) {
+                    rounds += 3;
+                } else if (startMin <= 30) {
+                    rounds += 2;
+                } else if (startMin <= 45) {
+                    rounds++;
+                }
+
+                //compute all full rounds in the finish hour
+                if (endMin >= 45) {
+                    rounds += 3;
+                } else if (endMin >= 30) {
+                    rounds += 2;
+                } else if (endMin >= 15) {
+                    rounds++;
+                }
+
+                //compute all full rounds in the all full hours between finishHour and startHour
+                rounds += (endHour - startHour - 1) * 4;
+                return rounds;
+            }
+        }
+    }
+}
diff --git a/src/test/java/com/fishercoder/_1904Test.java b/src/test/java/com/fishercoder/_1904Test.java
@@ -0,0 +1,62 @@
+package com.fishercoder;
+
+import com.fishercoder.solutions._1904;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class _1904Test {
+    private static _1904.Solution1 solution1;
+
+    @BeforeClass
+    public static void setup() {
+        solution1 = new _1904.Solution1();
+    }
+
+    @Test
+    public void test1() {
+        assertEquals(1, solution1.numberOfRounds("12:01", "12:44"));
+    }
+
+    @Test
+    public void test2() {
+        assertEquals(95, solution1.numberOfRounds("00:01", "00:00"));
+    }
+
+    @Test
+    public void test3() {
+        assertEquals(40, solution1.numberOfRounds("20:00", "06:00"));
+    }
+
+    @Test
+    public void test4() {
+        assertEquals(55, solution1.numberOfRounds("04:54", "18:51"));
+    }
+
+    @Test
+    public void test5() {
+        assertEquals(0, solution1.numberOfRounds("23:46", "00:01"));
+    }
+
+    @Test
+    public void test6() {
+        assertEquals(39, solution1.numberOfRounds("18:51", "04:54"));
+    }
+
+    @Test
+    public void test9() {
+        assertEquals(39, solution1.numberOfRounds("18:51", "04:50"));
+    }
+
+    @Test
+    public void test7() {
+        assertEquals(2, solution1.numberOfRounds("00:01", "00:57"));
+    }
+
+    @Test
+    public void test8() {
+        assertEquals(6, solution1.numberOfRounds("00:01", "01:57"));
+    }
+
+}
