PB25000027 (插座也会求偏导)
UID: 943, Registered at 2025-9-26 14:11:19, last login at 2025-10-12 18:47:19, currently offline.
Solved 16 problems, RP: 111.25 (No. 42)
UID: 943, Registered at 2025-9-26 14:11:19, last login at 2025-10-12 18:47:19, currently offline.
Solved 16 problems, RP: 111.25 (No. 42)