제출 #19889

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
19889	2016-02-25 06:46:41	Qwaz	순열 (kriii4_T)	C++98	0 / 100	0 ms	5816 KiB

T

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#include <iostream>
#include <vector>
using namespace std;
typedef long long ll;
const ll mod = 1000000007LL;
int times_mod(int a, int b) {
  return ll(a) * ll(b) % mod;
}
// solves a*x + b*y = d = gcd(a, b)
// if d == 1, x is a modular inverse of a mod b
void extended_gcd(ll a, ll b, ll &d, ll &x, ll &y)
{
    if(a < 0) {extended_gcd(-a, b, d, x, y); x *= -1; return;}
    if(b < 0) {extended_gcd(a, -b, d, x, y); y *= -1; return;}
  x = 0, y = 1;
  ll lx = 1, ly = 0, frac, tmp;
  while(b)
  {
    frac = a / b; 
    tmp = a; a = b; b = tmp % b;
    tmp = x; x = lx - frac * x; lx = tmp;
    tmp = y; y = ly - frac * y; ly = tmp;
  }
  x = lx; y = ly; d = a;
}
 
 
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