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Anatoly_And_Cockroaches.cpp
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71 lines (71 loc) · 1.41 KB
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#include<bits/stdc++.h>
using namespace std;
int main()
{
int l;cin>>l;
string s;cin>>s;
int m=0,m1=0;
for(int i=l-1;i>1;i--)
{
if(s[i]=='r'&&(s[i-1]=='r'))
{
if(s[i-2]=='b')
{
swap(s[i-1],s[i-2]);
i-=2;
m++;
}
else
{
m++;
s[i-1]='b';
}
}
else if(s[i]=='b'&&(s[i-1]=='b'))
{
if(s[i-2]=='r')
{
swap(s[i-1],s[i-2]);
i-=2;
m++;
}
else
{
m++;
s[i-1]='r';
}
}
}
for(int i=0;i<l-3;i++)
{
if(s[i]=='r'&&(s[i+1]=='r'))
{
if(s[i+2]=='b')
{
swap(s[i+1],s[i+2]);
i+=2;
m1++;
}
else
{
m1++;
s[i+1]='b';
}
}
else if(s[i]=='b'&&(s[i+1]=='b'))
{
if(s[i-2]=='r')
{
swap(s[i+1],s[i+2]);
i+=2;
m1++;
}
else
{
m1++;
s[i+1]='r';
}
}
}
cout<<max(m1,m);
}