模板-常数优化

void readint() {}
template<class T1, class ...T2>
void readint(T1 &i, T2&... rest){
    i=0;char c;bool f=false;
    while (!isdigit(c=getchar())) f=c=='-';
    do i=(i<<3)+(i<<1)+c-'0'; while (isdigit(c=getchar()));
    if (f) i=-i;
    readint(rest...);
}

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