why always in this problem http://mirror.codeforces.com/problemset/problem/233/B x is in range sqrt(n)-100 and sqrt(n)+100
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x= -s(x)/2 +_ sqrt(s(x)*s(x)+4*n)/2 here s(x)<100 since x**2 < n.
so x is in between -s(x)/2 + sqrt(n) and sqrt(n) +s(x)/2