Submission #667055

#	Time	Username	Problem	Language	Result	Execution time	Memory
667055		Kaztaev_Alisher	Money (IZhO17_money)	C++17	45 / 100	189 ms	22824 KiB

money

//#pragma GCC optomize ("Ofast")
//#pragma GCC optomize ("unroll-loops")
//#pragma GCC target ("avx,avx2,fma")
 
#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define sz size
#define cl clear
#define ins insert
#define ers erase
#define pii pair < int , int >
#define pll pair< long long  , long long >
#define all(x) x.begin() , x.end()
#define ios ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define tostr(x) to_string(x)
#define tonum(s) atoi(s.c_str())
#define seon(x) setprecision(x)
#define bpop(x) __builtin_popcount(x)
#define deb(x) cerr << #x  << " = " << x << endl;
 
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;
const double PI = 3.14159265;
 
const ll N = 1e6+5;
const ll mod = 1e9+7;
const ll inf = 1e9;
const ll INF = 1e18;
 
using namespace std;
 
ll a[N] , l[N] , r[N] , cnt[N];
pii p[N];
void solve(){
	int n;
	cin >> n;
	for(int i = 1; i <= n; i++){
		cin >> a[i];
		p[i] = {a[i] , i};
		cnt[a[i]]++;
	}
	sort(p+1,p+1+n);
	for(int i = 1; i <= n; i++){
		if(a[p[i-1].S] != a[p[i].S]) l[a[p[i].S]] = a[p[i-1].S];
		if(a[p[i+1].S] != a[p[i].S]) r[a[p[i].S]] = a[p[i+1].S];
	}
	ll ans = 0;
	for(int i = n; i >= 1; i--){
		int j = i , b = a[i];
		bool ok = 0;
		while(j-1 >= 1){
			if(a[j-1] == l[b] && (b == a[i] || cnt[b] == 1)) b = l[b];
			else if(a[j-1] != b) break; 
			cnt[a[j]]--;
			j--;
		}
		cnt[a[j]]--;
		if(cnt[a[i]] == 0 && cnt[a[j]] == 0) r[l[a[j]]] = r[a[i]] , l[r[a[i]]] = l[a[j]];
		else if(cnt[a[i]] == 0) r[a[j]] = r[a[i]];
		else if(cnt[a[j]] == 0) l[a[i]] = l[a[j]];
//		cout << i <<" " << j <<"\n";
		i = j;
		ans++;
	}
	cout << ans << "\n";
}
signed main(){
	ios;
	solve();
	return 0;
}
/*
 
8
710010 
388188 
309143 
388188 710010 
388188 710010 
484815
*/

Compilation message (stderr)

money.cpp: In function 'void solve()':
money.cpp:55:8: warning: unused variable 'ok' [-Wunused-variable]
   55 |   bool ok = 0;
      |        ^~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 0 / 55