輸入優化模板

丟一個模板在這裡以免忘記

inline char readchar()

{

static const size_t bufsize = 65536;

static char buf[bufsize];

static char *p = buf, *end = buf;

if (p == end) end = buf + fread_unlocked(buf, 1, bufsize, stdin), p = buf;

return *p++;

}

template <class T> void input(T& a)

{

static char p;

while ((p = readchar()) < '0') ;

a = p ^ '0';

while ((p = readchar()) >= '0') a *= 10, a += p ^ '0';

}

可能會用到的題目:TIOJ 1930 , ZJ c223 , TIOJ 2026