KContest - Week 01 (https://pastebin.com/sRSyprjT)
Problem Q
Quadratic Residues — Problem Statistics
Back to problem description| Submissions | 625 |
| Accepted submissions | 135 |
| Submission ratio | 21.60% |
| Authors | 119 |
| Accepted authors | 98 |
| Author ratio | 82.35% |