Function clearIthBit

CPP/bitmasking/bit-functions.cpp:16–19

    n=(n|mask);
}
void clearIthBit(int &n,int i){
    int mask =~(1<<i);
    n=n&mask;
}
void updateIthBit(int &n,int i,int v){
    clearIthBit(n,i);
    int mask=(v<<i);