_HappyCoder_'s Competition History
| Date | Contest | Rank | Performance | New Rating | Diff | |
|---|---|---|---|---|---|---|
| AtCoder Beginner Contest 417 | 6336 | 519 |  27 |
- | ||
| AtCoder Beginner Contest 421 | 10247 | - | - | - | ||
| AtCoder Beginner Contest 435 | 6444 | 445 | 76 |
+49 | ||
| AtCoder Beginner Contest 438 | 8672 | 176 | 90 |
+14 | ||
| AtCoder Beginner Contest 447 | 7709 | 224 |  107 |
+17 |