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F 自己做出来的一道2300的题。要求两个数都在[l,r]之间的数位dp。第一步肯定是容斥转换成每个数都是[0,x]之间的，ans=solve(r,r)-2*solve(l-1,r)+solve(l-1,l-1)，之后两个数一起dp就好了。