EducationalCodeforcesRound80(CF1288)A.Deadline题意给出正整数\(n,d\)，求不等式\(x+\lceil\frac{d}{x+1}\rceil\len\)是否有非负整数解。思路先不考虑上取整，\[x+\frac{d}{x+1}=x+1+\frac{d}{x+1}-1\ge2\sqrtd-1\]当且仅当\(x+1=\frac{d}{x+1}\)即\(