Submission #708123

#	Time	Username	Problem	Language	Result	Execution time	Memory
708123		mars4	Sails (IOI07_sails)	C++17	100 / 100	203 ms	9324 KiB

sails

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 

using namespace std;
using namespace __gnu_pbds; 

#define ff              first
#define ss              second
#define ll              int64_t
#define ld              long double
#define nl              cout<<"\n"
#define i128            __int128_t
#define all(v)          v.begin(),v.end()
#define mset(a,v)       memset((a),(v),sizeof(a))
#define forn(i,a,b)     for(int64_t i=int64_t(a);i<int64_t(b);++i)
#define forb(i,a,b)     for(int64_t i=int64_t(a);i>=int64_t(b);--i)
#define fastio()        ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

#define mod         1'000'000'007
#define mod2        998'244'353 
#define inf         1'000'000'000'000'007
#define pi          3.14159265358979323846

template<class key,class cmp=std::less<key>>
using ordered_set=tree<key,null_type,cmp,rb_tree_tag,tree_order_statistics_node_update>;

template<class L,class R> ostream& operator<<(ostream& out,pair<L,R> &p)        {return out<<"("<<p.ff<<", "<<p.ss<<")";}
template<class T> ostream& operator<<(ostream& out,vector<T> &v)                {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,deque<T> &v)                 {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,set<T> &s)                   {out<<"{";for(auto it=s.begin();it!=s.end();++it){if(it!=s.begin())out<<", ";out<<*it;}return out<<"}";}
template<class T> ostream& operator<<(ostream& out,ordered_set<T> &s)           {out<<"{";for(auto it=s.begin();it!=s.end();++it){if(it!=s.begin())out<<", ";out<<*it;}return out<<"}";}
template<class L,class R> ostream& operator<<(ostream& out,map<L,R> &m)         {out<<"{";for(auto it=m.begin();it!=m.end();++it){if(it!=m.begin())out<<", ";out<<*it;}return out<<"}";}

void dbg_out() {cerr<<"]\n";}
template<typename Head,typename... Tail> 
void dbg_out(Head H,Tail... T) {cerr<<H;if(sizeof...(Tail))cerr<<", ";dbg_out(T...);}
#ifdef LOCAL
#define dbg(...) cerr<<"["<<#__VA_ARGS__<<"] = [",dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

//---------------------------------mars4---------------------------------

class SegtreeMin
{
	ll N=0;
	vector<ll> segtree;
	vector<ll> lazy;

	ll _build(vector<ll> &a,ll st,ll ed,ll i=1)
	{
		if(st==ed)
			return segtree[i]=a[st];
		ll mid=(st+ed)>>1;
		return segtree[i]=min(_build(a,st,mid,i<<1),_build(a,mid+1,ed,i<<1|1));
	}

	void _push(ll st,ll ed,ll val,ll i)
	{
		if(st!=ed)
		{
			lazy[i<<1]+=val;
			lazy[i<<1|1]+=val;
		}
	}

	void _update(ll st,ll ed,ll l,ll r,ll val,ll i=1)
	{
		if(lazy[i])
		{
			segtree[i]+=lazy[i];
			_push(st,ed,lazy[i],i);
			lazy[i]=0;
		}
		if(st>ed or st>r or ed<l)
			return;
		if(st>=l and ed<=r)
		{
			segtree[i]+=val;
			_push(st,ed,val,i);
			return;
		}
		ll mid=(st+ed)>>1;
		_update(st,mid,l,r,val,i<<1);
		_update(mid+1,ed,l,r,val,i<<1|1);
		segtree[i]=min(segtree[i<<1],segtree[i<<1|1]);
	}

	ll _query(ll st,ll ed,ll l,ll r,ll i=1)
	{
		if(lazy[i])
		{
			segtree[i]+=lazy[i];
			_push(st,ed,lazy[i],i);
			lazy[i]=0;
		}
		if(st>ed or st>r or ed<l)
			return inf;
		if(st>=l and ed<=r)
			return segtree[i];
		ll mid=(st+ed)>>1;
		return min(_query(st,mid,l,r,i<<1),_query(mid+1,ed,l,r,i<<1|1));
	}

	ll _first_element_atmost_x(ll st,ll ed,ll l,ll r,ll val,ll i=1)
	{
		if(lazy[i])
		{
			segtree[i]+=lazy[i];
			_push(st,ed,lazy[i],i);
			lazy[i]=0;
		}
		if(st>ed or st>r or ed<l or segtree[i]>val)
			return -1;
		if(st==ed)
			return st;
		ll mid=(st+ed)>>1;
		ll ind=_first_element_atmost_x(st,mid,l,r,val,i<<1);
		if(ind==-1)
			ind=_first_element_atmost_x(mid+1,ed,l,r,val,i<<1|1);
		return ind;
	}

	public:
	void init(ll n,ll val=0)
	{
		N=n;
		segtree=vector<ll>(N<<2,val);
		lazy=vector<ll>(N<<2);
	}

	void build(vector<ll> &a)
	{
		_build(a,0,N-1);
	}

	void update(ll l,ll h,ll val)
	{
		_update(0,N-1,l,h,val);
	}

	ll query(ll l,ll h)
	{
		return _query(0,N-1,l,h);
	}

	ll first_element_atmost_x(ll l,ll r,ll val)
	{
		return _first_element_atmost_x(0,N-1,l,r,val);
	}

	void clear()
	{
		segtree=vector<ll>(N<<2);
		lazy=vector<ll>(N<<2);
	}
};

int main()
{
	fastio();
	ll z,n,m,t,k,i,j,l,d,h,r;
	cin>>n;
	vector<pair<ll,ll>> a(n);
	for(auto &[l,r]:a)
	{
		cin>>l>>r;
	}
	sort(all(a));
	ll N=100'000;
	SegtreeMin s;
	s.init(N);
	for(auto [l,r]:a)
	{
		ll rind=l-1;
		ll lind=rind-r+1;
		ll val=s.query(lind,lind);
		ll llind=s.first_element_atmost_x(0,rind,val);
		ll mind=s.first_element_atmost_x(0,rind,val-1);
		ll ex=mind-lind;
		if(mind==-1)
		{
			ex=r;
		}
		if(ex)
		{
			s.update(llind,llind+ex-1,1);
		}
		if(mind!=-1 and mind<=rind)
		{
			s.update(mind,rind,1);
		}
	}
	ll ans=0;
	forn(i,0,N)
	{
		ll tot=s.query(i,i);
		ans+=(tot*tot-tot)>>1;
	}
	cout<<ans<<"\n";
	cerr<<"\nTime elapsed: "<<1000*clock()/CLOCKS_PER_SEC<<"ms\n";
	return 0;
}

Compilation message (stderr)

sails.cpp: In function 'int main()':
sails.cpp:164:5: warning: unused variable 'z' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |     ^
sails.cpp:164:9: warning: unused variable 'm' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |         ^
sails.cpp:164:11: warning: unused variable 't' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |           ^
sails.cpp:164:13: warning: unused variable 'k' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |             ^
sails.cpp:164:15: warning: unused variable 'i' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |               ^
sails.cpp:164:17: warning: unused variable 'j' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                 ^
sails.cpp:164:19: warning: unused variable 'l' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                   ^
sails.cpp:164:21: warning: unused variable 'd' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                     ^
sails.cpp:164:23: warning: unused variable 'h' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                       ^
sails.cpp:164:25: warning: unused variable 'r' [-Wunused-variable]
  164 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                         ^

• 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