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--> 1 void extended_gcd(int a,int b,int *x,int *y)
2 {
3 int t;
4 if(b==0)
5 {
6 *x = 1;
7 *y = 0;
8 return ;
9 }
10 extended_gcd(b,a%b,x,y);
11 t = *x;
12 *x = *y;
13 *y = t - a/b*(*x);
14 }
15
16 int crt(int a[],int m[], int n)
17 {
18 int lcm,i,ans,Mi,x,y;
19 lcm = 1;
20 for(i=0;i<n;i++)
21 lcm *= m[i];
22 ans = 0;
23 for(i=0;i<n;i++)
24 {
25 Mi = lcm/m[i];
26 extended_gcd(Mi,m[i],&x,&y);
27 ans += Mi*x*a[i];
28 }
29 ans %= lcm;
30 while(ans<0)
31 ans += lcm;
32 return ans;
33 }
Code highlighting produced by Actipro CodeHighlighter (freeware)
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-->#include <stdio.h>
#include <stdlib.h>
void extended_gcd(int a,int b,int *x,int *y)
{
int t;
if(b==0)
{
*x = 1;
*y = 0;
return ;
}
extended_gcd(b,a%b,x,y);
t = *x;
*x = *y;
*y = t - a/b*(*x);
}
int crt(int a[],int m[], int n)
{
int lcm,i,ans,Mi,x,y;
lcm = 1;
for(i=0;i<n;i++)
lcm *= m[i];
ans = 0;
for(i=0;i<n;i++)
{
Mi = lcm/m[i];
extended_gcd(Mi,m[i],&x,&y);
ans += Mi*x*a[i];
}
ans %= lcm;
while(ans<0)
ans += lcm;
return ans;
}
int main()
{
int i, k;
int *b, *m;
while(1)
{
scanf("%d", &k);
b = (int*)malloc(sizeof(int) * k);
m = (int*)malloc(sizeof(int) * k);
if(!k)
break;
for(i = 0; i < k; i ++)
scanf("%d", &b[i]);
for(i = 0; i < k; i ++)
scanf("%d", &m[i]);
printf("%d
", crt(b, m, k));
free(b);
free(m);
}
return 0;
}