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Improved readme
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src/main/java/g3401_3500/s3421_find_students_who_improved/readme.md

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Original file line numberDiff line numberDiff line change
@@ -30,29 +30,29 @@ The result format is in the following example.
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Scores table:
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+------------+----------+-------+------------+
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| student_id | subject | score | exam_date |
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+------------+----------+-------+------------+
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| 101 | Math | 70 | 15-01-2023 |
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| 101 | Math | 85 | 15-02-2023 |
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| 101 | Physics | 65 | 15-01-2023 |
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| 101 | Physics | 60 | 15-02-2023 |
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| 102 | Math | 80 | 15-01-2023 |
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| 102 | Math | 85 | 15-02-2023 |
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| 103 | Math | 90 | 15-01-2023 |
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| 104 | Physics | 75 | 15-01-2023 |
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| 104 | Physics | 85 | 15-02-2023 |
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+------------+----------+-------+------------+
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+------------+----------+-------+------------+
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| student_id | subject | score | exam_date |
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+------------+----------+-------+------------+
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| 101 | Math | 70 | 15-01-2023 |
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| 101 | Math | 85 | 15-02-2023 |
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| 101 | Physics | 65 | 15-01-2023 |
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| 101 | Physics | 60 | 15-02-2023 |
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| 102 | Math | 80 | 15-01-2023 |
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| 102 | Math | 85 | 15-02-2023 |
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| 103 | Math | 90 | 15-01-2023 |
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| 104 | Physics | 75 | 15-01-2023 |
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| 104 | Physics | 85 | 15-02-2023 |
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+------------+----------+-------+------------+
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**Output:**
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+------------+----------+-------------+--------------+
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| student_id | subject | first_score | latest_score |
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+------------+----------+-------------+--------------+
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| 101 | Math | 70 | 85 |
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| 102 | Math | 80 | 85 |
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| 104 | Physics | 75 | 85 |
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+------------+----------+-------------+--------------+
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+------------+----------+-------------+--------------+
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| student_id | subject | first_score | latest_score |
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+------------+----------+-------------+--------------+
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| 101 | Math | 70 | 85 |
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| 102 | Math | 80 | 85 |
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| 104 | Physics | 75 | 85 |
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+------------+----------+-------------+--------------+
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**Explanation:**
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