你需要的不仅仅是快读，还有快写。

int read() {
    char c; int sign = 1;
    while((c = getchar()) < '0' || c > '9') if(c == '-') sign = -1;
    int res = c - '0';
    while((c = getchar()) >= '0' && c <= '9') res = res * 10 + c - '0';
    return res * sign;
}

void write(int x) {
    if(x > 9) write(x/10);
    putchar(x%10 + '0');
}

void writen(int x) {
    if(x < 0) {
        putchar('-');
        x = -x;
    }
    write(x);
    puts("");
}

实测加了快写，快了四倍