#include<bits/stdc++.h>
#define pb push_back
#define pf push_front
#define F first
#define S second
#define ff first
#define ss second
#define ll long long
#define ull unsigned long long
#define ld long double
#define pll pair<ll,ll>
#define plll pair<ll,pll>
#define pllll pair<pll,pll>
#define vl vector<ll>
#define vll vector<pll>
#define vlll vector<plll>
#define vllll vector<pllll>
#define vb vector<bool>
#define sz size()
#define fr front()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define bk back();
using namespace std;
const ld pi=3.14159265359;
const ll e5=1e5;
const ll e6=1e6;
const ll e9=1e9;
const ll inf=1e18;
const ll mod=1e9+7;
const ll mod2=998244353;
const ll N=1e5+5;
ll bpm(ll x,ll y,ll m){if(y==0)return 1%m;if(y==1)return x%m;ll p=bpm(x,y/2,m);
if(y%2==0)return p*p%m;else return p*p%m*x%m;}
ll bp(ll x,ll y){if(y==0)return 1;if(y==1)return x;ll p=bp(x,y/2);
if(y%2==0)return p*p;else return p*p*x;}
void solve(/**/){
ll n,n2,ans=0;
cin>>n;
n2=n*2;
pll p[n2+1];
for(ll i=1;i<=n2;i++) cin>>p[i].F>>p[i].S;
sort(p+1,p+n2+1);
for(ll i=1;i<=n2;i++){
ans+=abs(p[i].F-(i+1)/2);
}
ll x=0,y=0,s1=0,s2=0,l=1;
ll q=0;
for(ll i=1;i<=n2;i++){
if(p[i].S>=2) x++, s1+=p[i].S-2;
else y++, s2+=1-p[i].S;
if(i==n2||p[i].F!=p[i+1].F){
if(l%2==1){
if(i%2==1){
if(x>y) ans+=(x-y-1)/2, q=1;
else ans+=(y-x-1)/2, q=2;
}else{
if(x>=y) ans+=(x-y)/2;
else ans+=(y-x)/2;
}
}else{
if(i%2==1){
if(x>y){
if(q==1) ans+=(x-y)/2;
else ans+=(x-y-2)/2, q=1;
}else if(x<y){
if(q==2) ans+=(y-x)/2;
else ans+=(y-x-2)/2, q=2;
}
}else{
if(x>y){
if(q==1) ans+=(x-y+1)/2;
else ans+=(x-y-1)/2;
}else{
if(q==2) ans+=(y-x+1)/2;
else ans+=(y-x-1)/2;
}
}
}
x=y=0;
l=r+1;
}
}
ans+=s1+s2;
cout<<ans;
return;
}
int main(/*Aldk*/){
ios_base::sync_with_stdio(false);cin.tie(NULL);
//freopen(".in", "r", stdin);
//freopen(".out", "w", stdout);
//cout<<setprecision(6)<<fixed;
ll T=1;
//cin>>T;
for(ll i=1;i<=T;i++){
//cout<<"Case #"<<i<<": ";
solve();
//cout<<'\n';
}
return 0;
}
Compilation message
joi2019_ho_t4.cpp: In function 'void solve()':
joi2019_ho_t4.cpp:81:15: error: 'r' was not declared in this scope
81 | l=r+1;
| ^
