please tell where my code is incorrect
#include
using namespace std;
long long int optimalGame(long long int a[],long long int i,long long int j,long long int &vi,long long int &vj){
// base case
if(i==j){
return a[i];
}
if(i+1==j){
return max(a[i],a[j]);
}
// rec case
// if user takes 1st coin
vi+=a[i]+min(optimalGame(a,i+1,j-1,vi,vj),optimalGame(a,i+2,j,vi,vj));
// if user takes the last coin
vj+=a[j]+min(optimalGame(a,i,j-2,vi,vj),optimalGame(a,i+1,j-1,vi,vj));
// return max of the two choices made
return max(vi,vj);
}
int main() {
long long int n;
cin>>n;
long long int a[n];
for(long long int i=0;i<n;i++){
cin>>a[i];
}
long long int vi=0,vj=0;
cout<<optimalGame(a,0,n-1,vi,vj);
return 0;
}