Cod sursa(job #1206714)
Utilizator | Data | 10 iulie 2014 23:42:24 | |
---|---|---|---|
Problema | Invers modular | Scor | 40 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.5 kb |
#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,n,d;
int cmmdc(int a,int b,int &x,int &y){
if(!b){
x=1,y=0;
return a;
}
else{
int xa,ya,d=cmmdc(b,a%b,xa,ya);
x=ya;
y=xa-(a/b)*ya;
return d;
}
}
int main(void){
register int x,y;
f>>a>>n;
d=cmmdc(a,n,x,y);
if(x>0)
x+=(1-x/n)*n;
g<<x%n;
f.close();
g.close();
return 0;
}