hdu数学

wlzhouzhuan · 2019-02-05 21:16:41 · 个人记录

hdu1695

求\sum_{i=a}^{b}\sum_{j=c}^{d}gcd(i,j)==k,a=c=1

a,b,c,d <=100000,k<=100000

Time: 3000ms, Memory: 32768K