The Pascals triangle

Ok... this is the Pascals triangle in c++. In a short time Ill come with the version in java...
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#include<iostream>
using namespace std;
int n, a[20][20],i,j;
void citire()
{
for(i=1;i<=n;i++)
for(j=1;j<=i;j++)
{cout<<"a["<<i<<"]["<<j<<"]=";cin>>a[i][j];}
}
int main()
{cout<<"n=";cin>>n;
int s=0;
if(n>1 && n<21)
{
citire();
for(i=n-1;i>=1;i--)
for(j=1;j<i-1;j++)
if(a[i+1][j]>a[i+1][j+1])
s+=a[i+1][j+1];
//a[i][j]+=a[i+1][j+1];
else
s+=a[i+1][j];
//a[i][j]+=a[i+1][j];
}
cout<<s<<
;
//cout<<a[1][1]<<
;
return 0;
}

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