二十五之前我可能会秃头

A - Counterexample Description Your friend has recently learned about coprime numbers. A pair of numbers {a, b} is called coprime if the maximum number that divides both a and b is equal t

A - Night at the Museum Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 731A Description Grigoriy, like the hero of