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#include <iostream>
#include <fstream>
using namespace std;
int n, v[20];
int maxim(int a, int b)
{
if(a>=b)
return a;
else
return b;
}
int divide(int st, int dr)
{
if(st>=dr)
return -1;
int m,s_st=0,s_dr=0, r1, r2, r3, i, s=0;
m=(st+dr)/2;
r1=divide(st,m);
r2=divide(m+1,dr);
for(i=m;i>=st;i--)
{s=s+v[i];
s_st=maxim(s,s_st);
}
s=0;
for(i=m+1;i<=dr;i++)
{s=s+v[i];
s_dr=maxim(s_dr,s);
}
r3=s_st+s_dr;
return(maxim(r1,maxim(r2,r3)));
}
int main()
{
int i;
ifstream f("intrare.txt");
f>>n;
for(i=0;i<n;i++)
f>>v[i] ;
cout<< divide(0,n-1);
return 0;
}