Submission #134846

#	Time	Username	Problem	Language	Result	Execution time	Memory
134846		MvC	Sails (IOI07_sails)	C++11	100 / 100	108 ms	2684 KiB

sails

#pragma GCC target("avx2")
#pragma GCC optimization("O3")
#pragma GCC optimization("unroll-loops")
#include<bits/stdc++.h>
//#include "job.h"
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=1e5+50;
const ll mod=1e9+7;
using namespace std;
int n,i,mx,tot,x,k,l,lb,r,rb,mid,fw[nmax];
pair<int,int>a[nmax];
ll ans;
void upd(int l,int r)
{
	for(int i=l;i<=tot;i+=i&(-i))fw[i]++;
	for(int i=r;i<=tot;i+=i&(-i))fw[i]--;
}
int qry(int i)
{
	int rs=0;
	for(;i>=1;i-=i&(-i))rs+=fw[i];
	return rs;
}
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	cin>>n;
	for(i=1;i<=n;i++)
	{
		cin>>a[i].fr>>a[i].sc;
		tot=max(tot,a[i].fr);
	}
	sort(a+1,a+n+1);
	for(i=1;i<=n;i++)
	{
		mx=a[i].fr,k=a[i].sc;
		//cout<<mx<<" "<<k<<endl;
		upd(mx-k+1,mx+1);
		if(mx-k+1>1 && qry(mx-k+1)>qry(mx-k))
		{
			x=qry(mx-k);
			upd(mx+1,mx-k+1);
			l=1,r=mx-k,lb=1;
			while(l<=r)
			{
				mid=(l+r)/2;
				if(qry(mid)>x)l=mid+1,lb=l;
				else r=mid-1;
			}
			l=mx-k+1,r=mx,rb=mx;
			while(l<=r)
			{
				mid=(l+r)/2;
				if(qry(mid)<x)r=mid-1,rb=r;
				else l=mid+1;
			}
			upd(lb,lb+(rb-(mx-k+1)+1));
			upd(rb+1,mx+1);
			//cout<<lb<<" "<<rb<<" "<<i<<endl;
		}
	}
	for(i=1;i<=tot;i++)
	{
		x=qry(i);
		ans+=1LL*x*1LL*(x-1);
	}
	ans/=2LL;
	cout<<ans<<endl;
    return 0;
}

Compilation message (stderr)

sails.cpp:2:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("O3")
 
sails.cpp:3:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("unroll-loops")

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10