额，非常……快速读入
写C++局部代码

long long read() {
    long long s = 0;
    char x = getchar();
    while(x < '0' || x > '9')
        x = getchar();
    while(x >= '0' || x <= '9') {
        s = (s << 3) + (s << 1) + x - '0';
        x = getchar();
    }
    return s;
}