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#include <iostream>
#include <fstream>
using namespace std;
int n,k,v[16001],suma=0,mini=0,i,j;
int verif(int x)
{
int c,nr;
i=1;
nr=0;
while(i<=n)
{
c=x;
if(v[i]<=c)
{
while(v[i]<=c && i<=n)
{
c=c-v[i];
i++;
}
nr++;
}
}
if(nr<=k)
return 1;
else
return 0;
}
int caut(int st,int dr)
{
int mij;
while(st<=dr)
{
mij=(st+dr)/2;
if(verif(mij)==1 && verif(mij-1)==0)
return mij;
if(verif(mij)==0)
st=mij+1;
else
dr=mij-1;
}
}
int main()
{
ifstream f("transport.in");
ofstream g("transport.out");
f>>n>>k;
for(i=1;i<=n;i++)
{
f>>v[i];
suma=suma+v[i];
if(v[i]>mini)
mini=v[i];
}
if(verif(mini)==1)
g<<mini;
else
g<<caut(mini,suma);
f.close();
g.close();
return 0;
}