Submission #981658

#	Time	Username	Problem	Language	Result	Execution time	Memory
981658		shadow_sami	Sequence (APIO23_sequence)	C++17	13 / 100	934 ms	131308 KiB

sequence

#include<bits/stdc++.h>
#include "sequence.h"
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef vector<ll> vi;
typedef vector<vector<ll>> vvi;
typedef pair<ll,ll> pi;
typedef map<ll,ll> mi;
typedef long double ld;
typedef vector<ld> vd;
typedef vector<vector<ld>> vvd;
typedef pair<ld,ld> pd;
#define ff first
#define ss second
#define srt(a) sort(a.begin(),a.end());
#define fip(k, n) for (ll i = k; i < n; i++)
#define fjp(k, n) for (ll j = k; j < n; j++)
#define fin(k, n) for (ll i = k; i >= n; i--)
#define fjn(k, n) for (ll j = k; j >= n; j--)
#define fp(k, n, m) for (ll k = n; k < m; k++)
#define fn(k, n, m) for (ll k = n; k >= m; k--)
#define ordered_set tree<pi, null_type,less< pi >, rb_tree_tag,tree_order_statistics_node_update>
#define totalOne(n) __builtin_popcount(n)
#define backZero(n) __builtin_ctzll(n)
#define frontZero(n) __builtin_clzll(n)
#define fx(k) for ( auto x : k )
#define test ll t;cin >> t;while (t--)
#define nli "\n"

// ==========================(debug)============================================================================================== //

#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x <<" "; _printn(x); cerr << nli;
#else
#define debug(x)
#endif

void _printn(ll x){ cerr<<x<<" "; }
void _printn(int x){ cerr<<x<<" "; }
void _printn(ld x){ cerr<<x<<" "; }
void _printn(double x){ cerr<<x<<" "; }
void _printn(string x){ cerr<<x<<" "; }
void _printn(char x){ cerr<<x<<" "; }
void _printn(bool x){ cerr<<x<<" "; }
template<class T,class V>void _printn(pair<T,V> vv);
template<class T> void _printn(vector<T> vv);
template<class T> void _printn(set<T> vv);
template<class T,class V> void _printn(map<T,V> vv);
template<class T> void _printn(multiset<T> vv);
template<class T,class V>void _printn(pair<T,V> vv){ cerr<<"( ";_printn(vv.ff);cerr<<",";_printn(vv.ss);cerr<<")";}
template<class T> void _printn(vector<T> vv){ cerr<<"[ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"]"; };
template<class T> void _printn(set<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T> void _printn(multiset<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T,class V> void _printn(map<T,V> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };

// ==========================(debug)============================================================================================== //

ll n,m,tp,tp2,res,cnt,sum,tptp,ans;
const ll mx = 5e5+5;
const ll mod = 1e9+7;

// ==========================(MOD)=============================================================================================== //

ll mod_add(ll aa,ll bb){ return ((aa%mod)+(bb%mod))%mod; }
ll mod_minus(ll aa,ll bb){ return (((aa%mod)-(bb%mod))+10*mod)%mod; }
ll mod_mul(ll aa,ll bb){ return ((aa%mod)*(bb%mod))%mod; }
ll mod_power(ll aa,ll bb){ aa%=mod; ll empowered = 1; bb%=mod-1; while(bb > 0){ if(bb & 1) empowered = mod_mul(empowered,aa); bb = bb >> 1; aa = mod_mul(aa,aa); } return empowered; }
ll mod_divi(ll aa,ll bb){ aa=mod_mul(aa,mod_power(bb,mod-2)); return aa; }

// ==========================(MOD)=============================================================================================== //

bool f = false;
ll a[mx];
vi lis[mx];
ll pref[mx];

typedef struct SEGMENT_TREE{
	vi men,mex,laz;
	ll range;	
	void init(ll k){
		range = 4 * k;
		men.resize(range);	
		mex.resize(range);	
		laz.resize(range);	
		fip(0,n)
			men[i] = mex[i] = laz[i] = 0;		
		return;
	}
	void prop(ll ptr,ll l,ll r){
		mex[ptr] += laz[ptr];
		men[ptr] += laz[ptr];
		if(l!=r){
			laz[2*ptr] += laz[ptr];
			laz[2*ptr+1] += laz[ptr];
		}
		laz[ptr] = 0;
		return;
	}
	void update(ll ptr,ll l,ll r,ll st,ll en,ll val){
		prop(ptr,l,r);
		if(l>en || r<st)
			return;
		if(l>=st && r<=en){
			laz[ptr] += val;
			prop(ptr,l,r);
			return;
		}
		ll mid = l + (r-l) / 2;
		update(2*ptr,l,mid,st,en,val);
		update(2*ptr+1,mid+1,r,st,en,val);
		men[ptr] = min(men[2*ptr],men[2*ptr+1]);
		mex[ptr] = max(mex[2*ptr],mex[2*ptr+1]);
		return;
	}
	ll query_mn(ll ptr,ll l,ll r,ll st,ll en){
		prop(ptr,l,r);
		if(r<l)
			return 1e18;		
		if(l>en || r<st)
			return 1e18;
		if(l>=st && r<=en){			
			return men[ptr];
		}
		ll mid = l + (r-l) / 2;
		return min(query_mn(2*ptr,l,mid,st,en),query_mn(2*ptr+1,mid+1,r,st,en));
	}
	ll query_mx(ll ptr,ll l,ll r,ll st,ll en){
		prop(ptr,l,r);
		if(r<l)
			return -1e18;		
		if(l>en || r<st)
			return -1e18;
		if(l>=st && r<=en){			
			return mex[ptr];
		}
		ll mid = l + (r-l) / 2;
		return max(query_mx(2*ptr,l,mid,st,en),query_mx(2*ptr+1,mid+1,r,st,en));
	}
}SGT;

SGT st1,st2;

int sequence(int N, vector<int> A) {
	n = N;
	fip(0,n){
		a[i] = A[i];
		lis[a[i]].push_back(i);
	}
	ans = 1;
	st1.init(n);
	st2.init(n);
	fip(0,n){
		st1.update(1,0,n-1,i,n-1,1);
		st2.update(1,0,n-1,i,n-1,1);
	}
	fip(1,n+1){
		fx(lis[i]){
			st1.update(1,0,n-1,x,n-1,-2);
		}
		if((ll)lis[i].size() > 1){
			tp = lis[i][0];
			tp2 = lis[i][1];
			sum = st2.query_mx(1,0,n-1,tp2,n-1) - min(0ll,st2.query_mn(1,0,n-1,0,tp-1));
			res = st1.query_mn(1,0,n-1,tp2,n-1) - max(0ll,st1.query_mx(1,0,n-1,0,tp-1));
			if(sum>=0 && res<=0)
				ans = max(ans,2ll);
		}			
		fx(lis[i])
			st2.update(1,0,n-1,x,n-1,-2);		
	}
  	return ans;
}

// int main(){
//     ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//     #ifndef ONLINE_JUDGE
//         freopen("input1.txt", "r", stdin);
//         freopen("output1.txt", "w", stdout);
//         freopen("error1.txt", "w", stderr);
//     #endif // ONLINE_JUDGE

//         int N;
//         cin>>N;
//         vector<int> A(N);
//         for( auto &x : A)
//         	cin>>x;
//         cout<<sequence(N,A);
        
//     cerr << "Time elapsed: " << setprecision(6) << 1000.0 * clock() / CLOCKS_PER_SEC << "ms\n";
//     return 0;
// }

• Subtask 1: 0 / 11
• Subtask 2: 0 / 17
• Subtask 3: 0 / 7
• Subtask 4: 0 / 12
• Subtask 5: 13 / 13
• Subtask 6: 0 / 22
• Subtask 7: 0 / 18