摘要：
We know what a base of a number is and what the properties are. For example, we use decimal number system, where the base is 10 and we use the symbols 阅读全文
摘要：
Problem Description Here is a function f(x): int f ( int x ) { if ( x == 0 ) return 0; return f ( x / 10 ) + x % 10; } Now, you want to know, in a giv 阅读全文