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split up mod in division #93

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Merged
lrvideckis merged 2 commits into from
Nov 7, 2024
Merged

split up mod in division #93

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ebf0d81
split up mod in division
lrvideckis Nov 7, 2024
9a1287e
Merge branch 'dev' into mint_split_up
lrvideckis Nov 7, 2024
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9 changes: 1 addition & 8 deletions library/math/mod_int.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,12 +8,5 @@ struct mint {
mint operator+(mint b) { return x - mod + b.x; }
mint operator-(mint b) { return x - b.x; }
mint operator*(mint b) { return ll(x) * b.x % mod; }
mint operator/(mint b) {
int m = mod, u = 1, v = 0;
while (m)
u = exchange(v, u - b.x / m * v),
b.x = exchange(m, b.x % m);
assert(b.x == 1);
return *this * u;
}
#include "mod_int_division.hpp"
};
9 changes: 9 additions & 0 deletions library/math/mod_int_division.hpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
#pragma once
mint operator/(mint b) {
int m = mod, u = 1, v = 0;
while (m)
u = exchange(v, u - b.x / m * v),
b.x = exchange(m, b.x % m);
assert(b.x == 1);
return *this * u;
}
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