扩展欧几里德

 

#include <bits/stdc++.h>

#define Enter puts("")
#define Space putchar(' ')

using namespace std;

typedef long long ll;
typedef unsigned long long Ull;
typedef double Db;

inline ll Read()
{
    ll Ans = 0;
    char Ch = getchar() , Las = ' ';
    while(!isdigit(Ch))
    {
        Las = Ch;
        Ch = getchar();
    }
    while(isdigit(Ch))
    {
        Ans = (Ans << 3) + (Ans << 1) + Ch - '0';
        Ch = getchar();
    }
    if(Las == '-')
        Ans = -Ans;
    return Ans;
}

inline void Write(ll x)
{
    if(x < 0)
    {
        x = -x;
        putchar('-');
    }
    if(x >= 10)
        Write(x / 10);
    putchar(x % 10 + '0');
}

inline int Gcd(int a , int b)
{
    return b ? Gcd(b , a % b) : a;
}

inline int Extra_Gcd(int a , int b , int &x , int &y)
{
    if(!b)
    {
        x = 1;
        y = 0;
        return a;
    }
    int r = Extra_Gcd(b , a % b , x , y);
    int t = x;
    x = y;
    y = t - a / b * y;
    return r;
}

int main()
{
    int a , b;
    int x , y;
    a = Read();
    b = Read();
    Extra_Gcd(a , b , x , y);
    Write(x) , Space , Write(y);
    return 0;
}