Every one will meet some difficult

###Description 求方程 ∑ i = 1 m x i < = s \sum_{i=1}^{m}xi<=s ∑i=1m​xi<=s且对于i=1~n, x i < = t xi<=t xi<=t的正整数解数。 n,m<=1e9,nt<=s<=1e18,m-n<=1e3html ###Beat the Challeng ####Part 1 答案等于 ∑ i = 0
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