#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
// N - liczba wagoników
// M - minimalna liczba kolejek
// K - maks ilość błedów w kolejce
// pierwszy warunek: (N/M)=x r[] - zasięg maksymalny
// drugi warunek: x*M-(x-1) - minimalna liczba plusów na ilość kolejek o zasięgu x
int main()
{
int N;
int M;
int K;
int x;
cin>>N;
cin>>M;
cin>>K;
x=(N/M);
string prod;
cin>>prod;
//OPCJA LOSOWANIA
//srand(time(NULL));
/*
for(int i=0; i<N; i++)
{
int los=rand()%100;
//cout<<los%2<<endl;
if(los%2==0) prod[i]="+";
else prod[i]="-";
//cout<<prod[i];
}
*/
//OPCJA RĘCZNEGO WPROWADZENIA DANYCH
//cin>>prod;
int licznik=0;
int tab[N-1];
//cout<<x<<endl;
for(int i=0; i<N; i++)
{
if(prod[i]=='+') licznik++;
}
do
{
if(x*M-(x-1)<licznik) x--;
if(x-K==0) break;
//cout<<x<<endl;
for(int i=0; i<(N-1); i++)
{
int licznik=0;
for(int j=(N-2)-i; j>(N-2)-i-x; j--)
{
if(j<0) break;
if(prod[j]=='+') licznik++;
}
//cout<<licznik<<":"<<K<<" ";
if(licznik==x-K||licznik>x-K) tab[i]=1;
else tab[i]=0;
//cout<<"test"<<endl;
}
//cout<<endl;
int maks=0;
for(int i=0; i<(N-1); i++)
{
//cout<<tab[i]<<" ";
}
//cout<<endl;
for(int i=1; i<(N-1); i=i+x-1)
{
if(tab[i-1]==1&&tab[i]==1) tab[i-1]=0;
}
for(int i=0; i<(N-1); i++)
{
//cout<<tab[i]<<" ";
}
for(int i=0; i<(N-1); i++)
{
if(tab[i]==1) maks++;
}
//cout<<maks;
if(maks==M||maks>M)
{
cout<<maks;
break;
}
else
{
cout<<0;
break;
}
} while (x>1);
return 0;
}
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