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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int transport(int m,int v[],int n,int k)
{
int s=0;
int nr=0;
for(int i=1;i<=n;i++)
{
s+=v[i];
if(s>m)
{
s=v[i];
nr++;
}
}
if(nr<=k)
{
return 1;
}
return 0;
}
int main()
{
int n,k;
fin>>n>>k;
int v[n+1];
int st=0;
int dr=0;
for(int i=1;i<=n;i++)
{
fin>>v[i];
if(st<v[i])
{
st=v[i];
}
dr+=v[i];
}
int c=1;
while(st<=dr)
{
int m=(st+dr)/2;
if(transport(m,v,n,k))
{
c=m;
st=m+1;
}
else
{
dr=m-1;
}
}
fout<<c;
return 0;
}