Codeforces 525C Ilya and Sticks
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#include<stdio.h>
#include<algorithm>
using namespace std;
int main()
{
int n,i,l,ans;
int a[100010];
__int64 sum;
while(~scanf("%d",&n))
{
for(i=1;i<=n;i++)
scanf("%d",&a[i]);
sort(a+1,a+1+n);
sum=0;
ans=0;
for(i=n;i>1;i--)
{
if(a[i]-a[i-1]<2)
{
if(!ans)
{
l=a[i-1];
ans=1;
}
else
{
sum+=1LL*l*a[i-1];
ans=0;
}
i--;
}
}
printf("%I64d\n",sum);
}
return 0;
}
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