A Simple Math Problem （谢庆皇）

/*Lele now is thinking about a simple function f(x).函数 If x < 10 f(x) = x. If x >= 10 f(x) = a0 * f(x-1) + a1 * f(x-2) + a2 * f(x-3) + …… + a9 * f(x-10); And ai(0<=i<=9) can only be 0 or 1 .spa Now, I

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