Submission #1730844

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define mp make_pair
typedef long long ll;
multiset<ll> pos,neg;
int timer;
ll len[100011];
ll shiftpos,shiftneg;
int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n; cin>>n;
	ll m=0; ll c=0;
	for(int i=0;i<n;i++)
	{
		ll l,r; cin>>l>>r;
		len[i]=r-l;
		if(i>0){shiftpos+=len[i-1]; c-=len[i-1]*m;}
		shiftneg-=len[i];
		pos.insert(l-shiftpos); pos.insert(l-shiftpos);
		auto it=pos.begin(); ll res=(*it)+shiftpos;
		pos.erase(pos.begin()); neg.insert(res-shiftneg);
		ll neglas=(*prev(neg.end()))+shiftneg;
		ll posles=(*pos.begin())+shiftpos;
		if(!neg.empty()&&neglas>posles)
		{
			neg.erase(prev(neg.end())); pos.erase(pos.begin());
			pos.insert(neglas-shiftpos); neg.insert(posles-shiftneg);
		}
		m++; c-=l;
	}
	while(m>0)
	{
		c+=(*prev(pos.end()))+shiftpos;
		m--;
		pos.erase(prev(pos.end()));
	}
	cout<<c<<'\n';
}

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