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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,maxim,s=0,i,dr,st,mij,poz;
int v[16005];
int verif(int vol)
{
int sum=0, drum=1;
for(int i=1; i<=n; i++)
{
if(sum+v[i]<=vol)
sum+=v[i];
else if (v[i]>vol)
return 0;
else if (sum+v[i]>vol)
{
sum=v[i];
drum++;
}
}
if(k>=drum)
return 1;
return 0;
}
int main()
{
fin>>n>>k>>v[1];
maxim=v[1];
for(i=2;i<=n;i++)
{
fin>>v[i];
s+=v[i];
maxim=max(v[i],maxim);
}
st=maxim;
dr=s;
while(st<=dr)
{
mij=(st+dr)/2;
if(verif(mij)==1)
{
poz=mij;
dr=mij-1;
}
else
st=mij+1;
}
fout<<poz;
return 0;
}