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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,k,a[16005],max1,s,stg,dr,mijloc,suma,nr,i;
int main()
{
f>>n>>k;
for(i=1;i<=n;i++)
{
f>>a[i];
if(a[i]>max1)
max1=a[i];
s+=a[i];
}
stg=max1;
dr=s;
while(stg<=dr)
{
nr=1;
mijloc=(stg+dr)/2;
for(i=1;i<=n;i++)
{
suma+=a[i];
if(suma>mijloc)
{
suma=a[i];
nr++;
}
}
if(suma<=mijloc)
{
if(nr>k)
stg=mijloc+1;
else
dr=mijloc-1;
suma=0;
}
}
g<<stg;
return 0;
}