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Cod sursa(job #496514)
#include<stdio.h>
int n,m,ct[10],v[1001],a[501],b[501],c[1001];
void prod(int *a,int *b){
int i,j,t=0,p,n=b[0];
c[0]=0;
for(i=n;i;--i){p=t;
for(j=n;j>=i;--j)
p+=a[j]*b[i+n-j];
t=p/10;
c[0]++;
c[c[0]]=p%10;
}
while(t){
c[0]++;
c[c[0]]=t%10;
t/=10;
}
}
int main(){
freopen("prod.in","r",stdin);
freopen("prod.out","w",stdout);
int i,j,k;
for(i=1;i<10;++i) scanf("%d",&ct[i]);
for(i=9;i>=0;--i)
for(j=1;j<=ct[i];++j)
v[++n]=i;
m=n/2*2;
for(i=1;i<=m;++i)
if(i&1) a[0]++,a[a[0]]=v[i];
else b[0]++,b[b[0]]=v[i];
if(n>m) b[0]++,b[b[0]]=v[i];
if(a[0]<b[0]){
for(i=b[0];i>1;--i) a[i]=a[i-1];
a[1]=0;
a[0]=b[0];
}
prod(a,b);
for(i=c[0];i;--i) printf("%d",c[i]);
return 0;
}