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#include <iostream>
#include <fstream>
using namespace std;
const int maxN=16005;
int n,k;
int maxi;
int v[maxN];
int walking(int c)
{
int masa=0;
int nrtrans=1;
for(int i=1;i<=n;i++)
{
if(masa+v[i]<=c)
masa=masa+v[i];
else
{
nrtrans++;
masa=v[i];
}
}
if(nrtrans<=k)
return 1;
return 0;
}
int main()
{
ifstream f("transport.in");
ofstream g("transport.out");
f>>n>>k;
for(int i=1;i<=n;i++)
{
f>>v[i];
if(v[i]>maxi)
maxi=v[i];
}
int st=maxi;
int sol=n*maxi;
int dr=n*maxi;
while(st<=dr)
{
int mij=(st+dr)/2;
if(walking(mij))
{
sol=mij;
dr=mij-1;
}
else
st=mij+1;
}
g<<sol;
return 0;
}