sigma (((a*x+b)/c)^k)    l<=x<=r     1<=a,b,c<=10^9    1<=k<=50

how to solve??

http://www.lydsy.com/JudgeOnline/problem.php?id=3913

Interesting, most people hit WA2 then AC, but I skipped WA2 and jumped right to WA3, seem to be the first to hit it.   Can't find the error....switched to java & BigInteger thinking numerical overflow in c++ may be the issue but still WA3.   Argh.

New problem 1797 was added to the Problem set. Thanks to Xie Lingxi.