一个有趣的IO板子
encore
2019-07-01 14:18:02
```cpp
namespace input{
constexpr StandardType1 _k_max_input_size = 1 << 21;
char buf[_k_max_input_size], *p1 = buf, *p2 = buf;
inline StandardType1 getc(void) {
return __builtin_expect(p1 == p2, 0) && (p2 = (p1 = buf) +
fread(buf, 1, _k_max_input_size, fin),
__builtin_expect(p1 == p2, 0)) ? EOF : *p1++;
}
StandardType1 redi(void) {
StandardType1 x = 0; int f = 0; char ch = getc();
while (!std::isdigit(ch)) {
if (ch == '-') f = 1;
ch = getc();
}
while (std::isdigit(ch)) {
x = x * 10 + ch - 48;
ch = getc();
}
return f ? -x : x;
}
__attribute__((__fastcall__)) StandardType1 redi(StandardType1 &x) {
x = 0; int f = 0; char ch = getc();
while (!std::isdigit(ch)) {
if (ch == '-') f = 1;
ch = getc();
}
while (std::isdigit(ch)) {
x = x * 10 + ch - 48;
ch = getc();
}
return f ? -x : x;
}
template<typename ...Args> __attribute__((__fastcall__)) StandardType1
redi(StandardType1 &x, Args &...args) {
return redi(x), redi(args...);
}
}
namespace output{
constexpr StandardType1 _k_max_output_size = 1 << 21;
char buf[_k_max_output_size], a[20]; int p, p2= -1;
inline __attribute__((destructor)) void
flush(void) {
fwrite (buf, 1, p2 + 1, fout), p2 = -1;
}
inline void putch(const char c) {
if (__builtin_expect(p2 >= _k_max_output_size - 1, 0)) flush();
buf[++p2] = c;
}
inline void print(StandardType1 x) {
if (p2 > _k_max_output_size >> 1) flush();
if (x < 0) buf[++p2] = 45, x = -x;
while(a[++p] = x % 10 + 48, x /= 10);
while(buf[++p2] = a[p], --p);
}
inline void print(const char c, StandardType1 x) {
if (p2 > _k_max_output_size >> 1) flush();
if (x < 0) buf[++p2] = 45, x = -x;
while(a[++p] = x % 10 + 48, x /= 10);
while(buf[++p2] = a[p], --p);
buf[++p2] = c;
}
inline void print_str(const char *_str) {
while(putch(*_str), *(++_str));
}
inline void print_str(std::string x) {
for (char i:x) putch(i);
}
__attribute__((__fastcall__)) __attribute__((format(printf, 1, 2)))
void print(const char *__format, ...) {
va_list ap;
va_start(ap, __format);
std::string ti; bool flag = false;
while (*__format) {
if (flag) {
if (*__format == 'd') ti.append("d"), flag = false;
else if (*__format == 'l') ti.append("l");
else if (*__format == '%' && ti.length() == 2)
putch('%'), ti.clear(), flag = false;
else putch('%'), print_str(ti),
putch(*__format), ti.clear(), flag = false;
} else {
if (*__format == '%') flag = true;
else putch(*__format);
}
if (ti == "d") print(va_arg(ap, int)), ti.clear();
else if (ti == "lld") print(va_arg(ap, long long)), ti.clear();
++__format;
}
va_end(ap);
}
}
using input::getc;
using input::redi;
using output::print;
using output::print_str;
using output::putch;
```
print用法类似printf，其他不解释了。效率应该还不错，不过以有趣为主。