2025-11-06CF补题
Problem - 515C - Codeforces(1400)(string+a little factorial)
这题妙在把各个数字阶乘转换成仅含有2 3 5 7 数字,然后直接求解
要对每个数的阶乘进行换算[!tip]9 is 7!*8*9=7!*3!*3!*2!8 is …
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