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;
const int MAXN=100000;
long long k, n, suma=0, ats=LONG_MAX;
char a[MAXN], b[MAXN];
long long x[MAXN], y[MAXN];
vector<tuple<long long, long long, long long>> keliai;
long long kPtr=0, vPtr=1, dPtr=0;
long long kKairej=0, kDesinej=0, dKairej=0, dDesinej;
bool kairej[MAXN];
void tinkintKaire(long long kPos)/////////////////////////////
{
suma+=2ll*(kPos-get<0>(keliai[kPtr]));
kDesinej++;
///Lyg tiesiog atsiranda vienas?
///Problemos cia?
// cout<<"Pradedam "<<dPtr<<endl;
while (kKairej<kDesinej)
{
long long pradPos=get<0>(keliai[kPtr]);
kPtr++;
// cout<<"K"<<kPtr<<endl;
// cout<<dPtr<<endl;
// cout<<suma<<"->";
suma-=2ll*(get<0>(keliai[kPtr])-pradPos)*(kDesinej-kKairej);
// cout<<suma<<endl;
if (get<1>(keliai[kPtr])==0)
kDesinej--;
else
kKairej++;
}
}
void tinkintDesine(long long dPos)/////////////////////////////
{
if (dPos<=get<0>(keliai[dPtr]))
dKairej--;
///Problemos cia?
// cout<<"Pradedam "<<dPtr<<endl;
while (dKairej<dDesinej)
{
long long pradPos=get<0>(keliai[dPtr]);
dPtr++;
// cout<<dPtr;
while(kairej[get<2>(keliai[dPtr])])
{
// cout<<", "<<dPtr;
dPtr++;
}
// cout<<"D"<<dPtr<<endl;
// cout<<endl;
// cout<<suma<<"->";
suma-=2ll*(get<0>(keliai[dPtr])-pradPos)*(dDesinej-dKairej);
// cout<<suma<<endl;
if (get<1>(keliai[dPtr])==0)
dDesinej--;
else
dKairej++;
}
}
int main()
{
cin>>k>>n;
for (int i=0; i<n; i++)
{
cin>>a[i]>>x[i]>>b[i]>>y[i];
if (x[i]>y[i])
swap(x[i], y[i]);
suma+=y[i]-x[i];
if (a[i]!=b[i])
{
suma++;
keliai.push_back(make_tuple(x[i], 0, i));
keliai.push_back(make_tuple(y[i], 1, i));
}
}
keliai.push_back(make_tuple(0, 0, 0));
sort(keliai.begin(), keliai.end());
// cout<<suma<<endl;
// for (auto i:keliai)
// cout<<get<0>(i)<<' '<<get<1>(i)<<' '<<get<2>(i)<<endl;
for (int i=0; i<n; i++)
if (a[i]!=b[i])
suma+=2ll*(x[i]-get<0>(keliai[0]));
// cout<<suma<<endl;
ats=suma;
dDesinej=keliai.size()/2;
tinkintDesine(LONG_MAX);
if (k==1)
{
cout<<suma<<endl;
return 0;
}
while (vPtr!=2*n)
{
vPtr++;
while (vPtr<2*n && get<1>(keliai[vPtr])!=0)
vPtr++;
// cout<<"V"<<vPtr<<endl;
if (vPtr==2*n)
break;
///Tiesiog pradinis, viskas tvarkoj?
kairej[get<2>(keliai[vPtr])]=1;
tinkintKaire(get<0>(keliai[vPtr]));
tinkintDesine(y[get<1>(keliai[vPtr])]);
ats=min(ats, suma);
}
cout<<ats<<endl;
}
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