下面记录LeetCode中所有database中的所有free题目。
爱刷题的人从不怕找不到目录：
| Id | Title | Difficulty | Acceptance |
|---|---|---|---|
| 595 | Big Countries | Easy | 71.8% |
| 627 | Swap Salary | Easy | 67.0% |
| 620 | Not Boring Movies | Easy | 59.2% |
| 182 | Duplicate Emails | Easy | 47.3% |
| 175 | Combine Two Tables | Easy | 43.5% |
| 181 | Employees Earning More Than Their Managers | Easy | 40.3% |
| 183 | Customers Who Never Order | Easy | 38.2% |
| 596 | Classes More Than 5 Students | Easy | 31.9% |
| 197 | Rising Temperature | Easy | 31.6% |
| 196 | Delete Duplicate Emails | Easy | 26.4% |
| 176 | Second Highest Salary | Easy | 23.7% |
| 626 | Exchange Seats | Medium | 48.8% |
| 178 | Rank Scores | Medium | 30.8% |
| 180 | Consecutive Numbers | Medium | 28.7% |
| 184 | Department Highest Salary | Medium | 23.6% |
| 177 | Nth Highest Salary | Medium | 21.8% |
| 601 | Human Traffic of Stadium | Hard | 33.5% |
| 185 | Department Top Three Salaries | Hard | 20.6% |
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