initial commit: 603 added

Author: MaxineXiong

.gitignore

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+PDF/
+*.docx
+Challenging Problems on LeetCode.txt

603-consecutive-available-seats/603-consecutive-available-seats.sql

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+----Solution to LeetCode Database question 603: Consecutive Available Seats

603-consecutive-available-seats/README.md

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+### 603. Consecutive Available Seats
+
+Table: cinema
+
+```markdown
++-------------+------+
+| Column Name | Type |
+| seat_id     | int  |
++-------------+------+
+seat_id is an auto-increment primary key column for this table.
+Each row of this table indicates whether the ith seat is free or not. 1 means free while 0 means occupied.
+```
+
+Write an SQL query to report all the consecutive available seats in the cinema.
+
+Return the result table ordered by `seat_id` in ascending order.
+
+The test cases are generated so that more than two seats are consecutively available.
+
+The query result format is in the following example.
+
+**Example 1:**
+
+```markdown
+Cinema table:
++---------+------+
+| seat_id | free |
++---------+------+
+| 1       | 1    |
+| 2       | 0    |
+| 3       | 1    |
+| 4       | 1    |
+| 5       | 1    |
++---------+------+
+
+output:
++---------+
+| seat_id |
++---------+
+| 3       |
+| 4       |
+| 5       |
++---------+
+```