22 lines
406 B
C++
22 lines
406 B
C++
#include <bits/stdc++.h>
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using namespace std;
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#define int long long
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#define endl "\n"
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int exgcd(int a, int b, int &x, int &y) {
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if (!b) {
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x = 1, y = 0;
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return a;
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}
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int d = exgcd(b, a % b, y, x);
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y -= a / b * x;
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return d;
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}
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signed main() {
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int a, b;
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cin >> a >> b;
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int x, y;
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exgcd(a, b, x, y);
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cout << (x % b + b) % b << endl;
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} |