Problem Description As is known to all, Sempr(Liangjing Wang) had solved more than 1400 problems on POJ, but nobody know the days and nights he had spent on s...
Problem Description Happy new year to everybody! Now, I want you to guess a minimum number x betwwn 1000 and 9999 to let (1) x % a = 0; (2) (x+1) % b = ...
Problem Description As you know, Gardon trid hard for his love-letter, and now he’s spending too much time on choosing flowers for Angel. When Gardon entere...
Problem Description Goldbach’s Conjecture: For any even number n greater than or equal to 4, there exists at least one pair of prime numbers p1 and p2 such th...