This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define int long long
int nbVal;
vector<int> initType;
string valDeb;
int verif(int bla1,int noir1,int bla2,int noir2) {
if (bla1>bla2) {
return verif(bla2,noir2,bla1,noir1);
}
if (bla1>noir1) {
return verif(noir1,bla1,noir2,bla2);
}
if (bla2>bla1 and bla2<noir1) {
if (noir2>noir1 or noir2<bla1) {
return 1;
}
else {
return 0;
}
}
else {
if (noir2>bla1 and noir2<noir1) {
return 1;
}
else {
return 0;
}
}
}
int compt(vector<int> listeBla,vector<int> listeNoir) {
int nbInter=0;
for (int i=0;i<nbVal;i++) {
for (int j=i+1;j<nbVal;j++) {
nbInter+=verif(listeBla[i],listeNoir[i],listeBla[j],listeNoir[j]);
}
}
return nbInter;
}
int calc(vector<int> typeSom) {
int rep=0;
vector<int> listeBla,listeNoir;
for (int i=0;i<2*nbVal;i++) {
if (typeSom[i]==0) {
listeBla.push_back(i);
}
else {
listeNoir.push_back(i);
}
}
vector<int> ordreNoir;
for (int i=0;i<nbVal;i++) {
ordreNoir.clear();
for (int j=0;j<nbVal;j++) {
ordreNoir.push_back(listeNoir[(i+j)%nbVal]);
}
rep=max(rep,compt(listeBla,ordreNoir));
}
return rep;
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cin>>nbVal;
cin>>valDeb;
for (int i=0;i<2*nbVal;i++) {
if (valDeb[i]=='W') {
initType.push_back(0);
}
else {
initType.push_back(1);
}
}
cout<<calc(initType)<<endl;
return 0;
}
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