2bNot2b-ICPC-CodeBook/ModIntClass.cpp at main · saksham-2000/2bNot2b-ICPC-CodeBook · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
const int MOD = 1e9 + 7;

// NOTE: CAST TO INT FOR PRINTING

struct mi {

	int v;

	explicit operator int() const { return v; }

	mi() { v = 0; }

	mi(long long _v) : v(_v % MOD) { v += (v < 0) * MOD; }

};

mi &operator+=(mi &a, mi b) {

	if ((a.v += b.v) >= MOD) a.v -= MOD;

	return a;

}

mi &operator-=(mi &a, mi b) {

	if ((a.v -= b.v) < 0) a.v += MOD;

	return a;

}

mi operator+(mi a, mi b) { return a += b; }

mi operator-(mi a, mi b) { return a -= b; }

mi operator*(mi a, mi b) { return mi((long long)a.v * b.v); }

mi &operator*=(mi &a, mi b) { return a = a * b; }

mi pow(mi a, long long p) {

	assert(p >= 0);

	return p == 0 ? 1 : pow(a * a, p / 2) * (p & 1 ? a : 1);

}

mi inv(mi a) {

	assert(a.v != 0);

	return pow(a, MOD - 2);

}

mi operator/(mi a, mi b) {
    return a * inv(b);
}

// NOTE: CAST TO INT FOR PRINTING