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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n, k, ok;
vector<int> v;
bool verif(int x)
{
int nr=1, s=0;
for(int i=0;i<n;i++)
{
if(v[i]>x)
{
nr=k+1;
break;
}
s+=v[i];
if(s>x)
{
s=v[i];
nr++;
}
}
if(nr>k)
return false;
return true;
}
int cautare_binara(int st, int dr)
{
if(ok==0)
{
int mij;
while(st<dr)
{
mij=(st+dr)/2;
if(verif(mij))
{
dr=mij-1;
cautare_binara(st, dr);
}
else
{
st=mij+1;
cautare_binara(st, dr);
}
}
ok=1;
return st;
}
}
int main()
{
int x, s=0,minim=16002;
f>>n>>k;
for(int i=1;i<=n;i++)
{
f>>x;
v.push_back(x);
s+=v[i-1];
minim=min(minim, v[i-1]);
}
g<<cautare_binara(minim, s);
return 0;
}