模板分享：快读快写

Code

// unlocked putchar, getchar
// #define LOCAL
#ifdef LOCAL
#define getchar_unlocked getchar
#define putchar_unlocked putchar
#endif

template<class T>
inline T read() {
    T x = 0, f = 1;
    char ch = getchar_unlocked();
    while (ch < '0' || ch > '9') {
        if (ch == '-') f = -1;
        ch = getchar_unlocked();
    }
    while (ch >= '0' && ch <= '9') {
        x = (x << 3) + (x << 1) + (ch ^ 48);
        ch = getchar_unlocked();
    }
    return x * f;
}

template<class T>
inline void write(T x) {
    if (x < 0) {
        putchar_unlocked('-');
        x = -x;
    }
    if (x > 9) write(x / 10);
    putchar_unlocked(x % 10 + '0');
    return;
}

Usage

读入一个整数用 x = read<T>()，其中 T 为 x 的类型.
输出一个整数用 write(x).
在 windows 本地调试时，需要将 #define LOCAL 那行的注释去掉.

Example

读入 $n$ 个整数，输出它们的和.

signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	
	const int n = read<int>();
	i64 res = 0;
	for (int i = 0; i < n; i++) res += read<int>();
	write(res), putchar_unlocked('\n');
	return 0;
}