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