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Cod sursa(job #68364)
#include<stdio.h>
#include<string.h>
FILE*f=fopen("next.in","r");
FILE*g=fopen("next.out","w");
long long d,r;
short int b[1000009];
int a[1000009];
void read()
{
char x[1000009];
fscanf(f,"%s\n",x);
fscanf(f,"%lld",&d);
long long i;
a[0]=strlen(x);
for(i=0;i<a[0];++i)
{
a[a[0]-i]=x[i]-'0';
}
}
long mod(int A[], long long B)
{
long long i, t = 0;
for (i = A[0]; i > 0; i--)
t = (t * 10 + A[i]) % B;
return t;
}
void add()
{
int c,t=0,i;
if(a[0]>b[0]) { for(i=b[0]+1;i<=a[0];++i) b[i]=0; b[0]=a[0];}
else {for(i=a[0]+1;i<=b[0];++i) a[i]=0; a[0]=b[0];}
for(i=1;i<=a[0];++i)
{
c=a[i];
a[i]=(a[i]+b[i]+t)%10;
t=(c+b[i]+t)/10;
}
if(t>0) a[++a[0]]=t;
}
void transf()
{
b[0]=0;
while (d)
{
b[0]++ ;
b[b[0]]=d%10;
d/=10;
}
}
int main()
{
read();
long long i;
r=mod(a,d);
d=(d-r)%d;
transf();
add();
for(i=a[0];i>=1;--i) fprintf(g,"%d",a[i]);
return 0;
}