Small Tricks Collection

1. Whether one letter is uppercase or lowercase, (?). &31) is where it is located in the alphabet. This simple method can be used for the question of the usurper , for example: Vigenère password.

2. Decimal to R binary, R is negative, or follow the normal operation, pay attention to one point:

When the remainder <0, then quotient +1, remainder +| r|

Code:

        k=x%R;  Remainder        x=x/R;  Business          if(k<0) {            x+ +;            K-=R        ;        }

3 . The original always thought long long int is not much slower than int, when I really because long long int was card time to discover, the time difference between the two really many ...

Small Tricks Collection