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#include <bits/stdc++.h>
#define Dim 16001
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
long N,K,Saltele[Dim],sum[Dim],maxim,reper;
long drum,solutie;
bool stop=1;
int main()
{
f>>N>>K;
for(int i=1;i<=N;i++)
{
f>>Saltele[i];
maxim=max(maxim,Saltele[i]);
sum[i]=sum[i-1]+Saltele[i];
}
long st=maxim,dr=sum[N];
while(st<dr)
{
long mij=(st+dr)/2;
reper=0,drum=0;
for(int i=1;i<=N-1;i++)
{
if(sum[i+1]-sum[reper]>mij)
drum++,reper=i,i--;
else
if(i==N-1) drum++;
if(drum>K) break;
}
if(drum==K) solutie=mij;
if(drum<=K) dr=mij;
else
st=mij+1;
}
g<<solutie;
return 0;
}