自定义头文件"almighty.h"

持续更新

头文件内部内容：

#ifndef _ALMIGHTY_
#define _ALMIGHTY_

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

#define sd signed
#define ud unsigned
#define ct const
#define sc static
typedef int i4;
typedef long long i8;
typedef float f4;
typedef double f8;
typedef void vd;
typedef bool bl;
typedef char cr;

#define Sf scanf
#define Pf printf
#define Gc getchar

#define Up(a, b, c, d) for (a = b; a <= c; a += d)
#define Dn(a, b, c, d) for (a = b; a >= c; a -= d)

i4 lowbit(i4);
i4 qpow(i4, i4, ct i4);
i4 inv(i4, i4);
i4 gcd(i4, i4);
i4 qgcd(i4, i4);
i4 exgcd(i4, i4, i4, i4);

#endif

函数实现：

#include"almighty.h"

i4 lowbit(i4 x) {
	return x & (-x);
}
i4 qpow(i4 a, i4 b, ct i4 p) {
	i4 res = 1;
	for (; b; b >>= 1ll, a = (i8)a * a % p)
		if (b & 1)
			res = (i8)res * a % p;
	return res;
}
i4 inv(i4 n, i4 p) {
	return qpow(n, p - 2, p);
}
i4 gcd(i4 a, i4 b) {
	return !b ? a : gcd(b, a % b);
}
i4 qgcd(i4 a, i4 b) {
	i4 x = __builtin_ctz(a), y = __builtin_ctz(b), z = min(x, y), k;
	b >>= y;
	while (a) {
		a >>= x;
		k = b - a;
		x = __builtin_ctz(k);
		if (a < b) b = a;
		a = k < 0 ? -k : k;
	}
	return b << z;
}
i4 exgcd(i4 a, i4 b, i4 &x, i4 &y) {
	if (!b) {
		x = 1, y = 0;
		return a;
	}
	i4 d = exgcd(b, a % b, x, y), t = x;
	x = y, y = t - (a / b) * y;
	return d;
}

希望会有点用。。。