I/O 優化模板 (C++)

理論上可以再更快，但就沒有顯著差異，用 fread / fwrite 就足夠快了。

模板

#include <bits/stdc++.h>
using namespace std;

/* --- fast io --- */
#define MAXSIZE (1 << 20)
char buf[MAXSIZE], *p1 = buf, *p2 = buf;
char pbuf[MAXSIZE], *pp = pbuf;

static inline char gc() {
    if (p1 == p2 && (p2 = (p1 = buf) + fread(buf, 1, MAXSIZE, stdin)) == buf) return EOF;
    return *p1++;
}

static inline int read_int() {
    int x = 0;
    char c = gc(), neg = 0;
    while ((c > '9' || c < '0') && c != '-' && c != EOF) c = gc();
    if (c == '-') neg = 1, c = gc();
    while (c >= '0' && c <= '9') {
        x = (x << 3) + (x << 1) + (c - '0');
        c = gc();
    }
    return neg ? ~x + 1 : x;
}

static inline void pc(const char c) {
    if (pp - pbuf == MAXSIZE) fwrite(pbuf, 1, MAXSIZE, stdout), pp = pbuf;
    *pp++ = c;
}

static inline void write_int(int x) {
    static char ch[20];
    static int idx = 0;
    if (x < 0) x = ~x + 1, pc('-');
    if (x == 0) ch[++idx] = 0;
    while (x > 0) ch[++idx] = x % 10, x /= 10;
    while (idx) pc(ch[idx--] + 48);
}

static inline void clean_up() { fwrite(pbuf, 1, pp - pbuf, stdout); }
/* --------------- */

int main() {
    int x = read_int();
    int y = read_int();
    write_int(x + y);
    pc('\n');
    clean_up();
    return 0;
}