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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int v[16001];
int trsp(int k, int n)
{
int i,sum=0,nr=1;
for(i=1;i<=n;i++)
{
sum+=v[i];
if(sum>k)
{
sum=v[i];
nr++;
}
}
return nr;
}
int CB(int p, int q, int k, int n)
{
int m,T;
while(p<=q)
{
m=(p+q)/2;
T=trsp(m,n);
if(T==k)
{
if(trsp(m-1,n)>k)
return m;
else q=m-1;
}
else
{
if(T<k)
q=m-1;
else p=m+1;
}
}
}
int main()
{int n,k,i;
f>>n>>k;
int maxx=0,sum=0;
for(i=1;i<=n;i++)
{
f>>v[i];
sum+=v[i];
if(maxx<v[i]) maxx=v[i];
}
int rez=CB(maxx,sum,k,n);
if(rez==0) rez++;
g<<rez;
return 0;
}