diff --git a/basic/src/main/java/lo/basic/Issue13.java b/basic/src/main/java/lo/basic/Issue13.java
index e1f8aa2..491e40b 100644
--- a/basic/src/main/java/lo/basic/Issue13.java
+++ b/basic/src/main/java/lo/basic/Issue13.java
@@ -4,17 +4,127 @@
 
 public class Issue13 {
 	public static void main(String[] args) {
-		int[] data = {5, 5, 6, 6, 78, 78, 78, 9487, 9487, 9487, 9487, 65535};
+		int[] data = { 5, 5, 6, 6, 78, 78, 78, 9487, 9487, 9487, 9487, 65535 };
 		int[] result = longest(data);
+		int[] result_v4 = longest_v4(data);
+		int[] result_v5 = longest_v5(data);
+		int[] result_v6 = longest_v6(data);
+		int[] result_v7 = longest_v7(data);
 		System.out.println(Arrays.toString(result));
+		System.out.println(Arrays.toString(result_v4));
+		System.out.println(Arrays.toString(result_v5));
+		System.out.println(Arrays.toString(result_v6));
+		System.out.println(Arrays.toString(result_v7));
+		int[] bugTest_2 = { 3, 5, 6, 7, 8, 99, 300 };
+		int[] answer_test_2 = { 3, 1 };
+		System.out.println("第一個數字數量最多的情況： ");
+		System.out.println("數字數量都是 1 的情況： ");
+		System.out.println("修正後為 ：" + test(longest_v5(bugTest_2), answer_test_2));
 	}
 
 	/**
 	 * @param data 已經排序過的 array
 	 * @return result[0] 是最長平台的數字，result[1] 是長度
 	 */
+
 	private static int[] longest(int[] data) {
-		//FIXME
-		return new int[]{9487, 4};
+		int counter = 1;
+		int max_counter = 1;
+		int number = data[0];
+		for (int i = 0; i < data.length - 1; i++) {
+			if (data[i] == data[i + 1]) {
+				counter += 1;
+				if (counter > max_counter) {
+					max_counter = counter;
+					number = data[i];
+				}
+			} else {
+				counter = 1;
+			}
+		}
+		return new int[] { number, max_counter };
+	}
+
+	private static int[] longest_v4(int[] data) {
+		int i = 0;
+		int number = 0;
+		int max_counter = 0;
+		for (int ii = 1; ii < data.length; ii++) {
+			if (ii - i + 1 > max_counter) {
+				max_counter = ii - i;
+				number = data[i];
+				if (data[i] == data[data.length - 1]) {
+					max_counter += 1;
+					number = data[ii];
+				}
+			}
+			if (data[i] != data[ii]) {
+				i = ii;
+			}
+		}
+		return new int[] { number, max_counter };
+	}
+
+	private static int[] longest_v5(int[] data) {
+		int number = data[0];
+		int counter = 1;
+		int max_counter = 1;
+		for (int i = 1; i < data.length; i++) {
+			counter += 1;
+			if (data[i] != data[i - 1]) {
+				counter = 1;
+			}
+			if (counter > max_counter) {
+				max_counter = counter;
+				number = data[i];
+			}
+		}
+		return new int[] { number, max_counter };
+	}
+
+	private static int[] longest_v6(int[] data) {
+		int counter = 0;
+		int number = data[0];
+		int max_counter = 0;
+		int max_number = data[0];
+		for (int i = 0; i < data.length; i++) {
+			counter += 1;
+			if (data[i] == number && counter > max_counter) {
+				max_counter = counter;
+				max_number = number;
+			} else if (data[i] != number) {
+				number = data[i];
+				counter = 1;
+			}
+		}
+		return new int[] { max_number, max_counter };
+	}
+
+	private static int[] longest_v7(int[] data) {
+		int max = 0;
+		int num = data[0];
+		int counter = 1;
+		for (int i = 1; i < data.length; i++) {
+			if (data[i] == data[i - 1]) {
+				counter += 1;
+				continue;
+			}
+			if (counter > max) {
+				max = counter;
+				num = data[i - 1];
+			}
+			counter = 1;
+		}
+		if (counter > max) {
+			max = counter;
+			num = data[data.length - 1];
+		}
+		return new int[] { num, max };
+	}
+
+	private static boolean test(int[] value, int[] answer) {
+		System.out.println("value = " + Arrays.toString(value));
+		System.out.println("answer = " + Arrays.toString(answer));
+		return value[0] == answer[0] && value[1] == answer[1];
 	}
-}
+}
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