题目要求找到在[1, n]范围内，经过k次特定操作（将数字变为二进制1的个数）后变成1的特殊数字的数量。通过递推关系和数位DP方法解决，最终对结果取模10^9 + 7。"
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C. Travelling Salesman and Special Numbers
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
The Travelling Salesman spends a lot of time travelling so he tends to get bored. To pass time, he likes to perform operations on numbers. One such operation is to take a positive integer x and reduce it to the number of bits set to 1 in the binary representation of x. For example for number 13 it's true that
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