C++ FastIO

一个基于 fread 和 fwrite 的 C++ 快速输入输出模板（Fast I/O）。

# 源码

#include <bits/stdc++.h>

using namespace std;

namespace fastio {
    static constexpr int SZ = 1 << 20;
    char inbuf[SZ], outbuf[SZ], *p1 = inbuf, *p2 = inbuf, *p3 = outbuf;
    
    inline char gc() {
        return p1 == p2 && (p2 = (p1 = inbuf) + fread(inbuf, 1, SZ, stdin), p1 == p2) ? EOF : *p1++;
    }
    
    inline void pc(char c) {
        if (p3 == outbuf + SZ) fwrite(outbuf, 1, SZ, stdout), p3 = outbuf;
        *p3++ = c;
    }
    
    struct Flush {
        ~Flush() { fwrite(outbuf, 1, p3 - outbuf, stdout); }
    } call_flush;
    
    template <typename T>
    inline void read(T &x) {
        x = 0; char c = gc(); bool f = false;
        while (!isdigit(c)) f |= (c == '-'), c = gc();
        while (isdigit(c)) x = (x << 3) + (x << 1) + (c ^ 48), c = gc();
        if (f) x = -x;
    }
    
    template <typename T, typename... Args>
    inline void read(T &x, Args &... args) {
        read(x), read(args...);
    }
    
    inline void read(char &c) {
        while ((c = gc()) <= 32);
    }
    
    inline void read(string &s) {
        s = ""; char c = gc();
        while (c <= 32) c = gc();
        while (c > 32) s += c, c = gc();
    }
    
    template <typename T>
    inline void print(T x) {
        if (x < 0) pc('-'), x = -x;
        if (x > 9) print(x / 10);
        pc(x % 10 + '0');
    }
    
    inline void print(char c) { pc(c); }
    
    inline void print(const string &s) {
        for (char c : s) pc(c);
    }
    
    inline void print(const char *s) {
        while (*s) pc(*s++);
    }
    
    template <typename T, typename... Args>
    inline void print(T x, Args... args) {
        print(x), print(args...);
    }
}

using namespace fastio;

int main() {
    // 示例用法
    int a, b;
    read(a, b);
    print(a + b, '\n');
    return 0;
}