洛谷：P5091 【模板】扩展欧拉定理

*转载与该题题解

#include <cstdio>

int a, m, phi = 1;
int bm, flag;

int qPow(int b, int e) {
	int a = 1;
	for (; e; e >>= 1, b = (long long)b * b % m)
		if(e & 1) a = (long long)a * b % m;
	return a;
}

int main() {
	scanf("%d%d", &a, &m);
	a %= m;
	int mm = m;
	for (int i = 2; i * i <= mm; ++i) {
		if (mm % i) continue;
		phi *= i - 1;
		mm /= i;
		while (mm % i == 0)
			phi *= i,
			mm /= i;
	} if (mm > 1) phi *= mm - 1;
	char ch;
	while ((ch = getchar()) < '0' || ch > '9') ;
	while (bm = bm * 10ll + (ch ^ '0'), (ch = getchar()) >= '0' && ch <= '9')
		if (bm >= phi) flag = 1, bm %= phi;
	if (bm >= phi) flag = 1, bm %= phi;
	if (flag) bm += phi;
	printf("%d", qPow(a, bm));
	return 0;
}

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