Submission #1142912

#	Time	Username	Problem	Language	Result	Execution time	Memory
1142912		nasir_bashirov	Izbori (COCI22_izbori)	C++17	40 / 110	3092 ms	6724 KiB

Main

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vl vector<ll>
#define vii vector<pii>
#define db long double
#define vll vector<pll>
#define endl '\n'
#define pb push_back
#define all(x) x.begin(), x.end()
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

// #define int long long 

struct fenwickTree{
    ll n;
    vl BIT;
    fenwickTree(int sz){
        n = sz;
        BIT.resize(n + 1, 0);
    }
    void update(int i, int v){
        if(i == 0)    return;
        while(i <= n){
            BIT[i] += v;
            i += i & (-i);
        }
    }
    ll query(int l, int r){
        if(l > r)   return 0;   
        if(l != 1)    return query(1, r) - query(1, l - 1);
        ll res = 0;
        while(r > 0){
            res += BIT[r];
            r -= r & (-r);
        }
        return res;
    }
};

const int sz = 2e5 + 5;
int a[sz], pre[sz], n, mx;
fenwickTree t(2 * sz + 5);
ll res;

void solve1(int x){
	pre[0] = n + 1;
	for(int i = 1; i <= n; i++){
		pre[i] = pre[i - 1] + (a[i] == x ? 1 : -1);
	}
	for(int i = 1; i <= 2 * n + 1; i++)	t.update(i, -t.query(i, i));
	for(int i = 0; i <= n; i++){
		res += t.query(1, pre[i] - 1);
		t.update(pre[i], 1);
	}
}

void solve2(int x, int cnt){
	for(int j = 1; j <= 2 * cnt - 1; j++){
		if(j > n)	continue;
		int s = 0;
		for(int i = 1; i < j; i++){
			s += (a[i] == x ? 1 : -1);
		}
		for(int i = j; i <= n; i++){
			s += (a[i] == x ? 1 : -1);
			if(s > 0)	res++;
			s -= (a[i - j + 1] == x ? 1 : -1);
		}
	}
}

void fmain(){
	cin >> n;
	map<int, int> cnt;
	for(int i = 1; i <= n; i++){
		cin >> a[i];
		cnt[a[i]]++;
	}	
	for(pii i : cnt){
		if(i.second <= 2000)	solve2(i.first, i.second);
		else	solve1(i.first);
	}
	cout << res;
}

signed main(){
	fastio;
	int tmr = 1;
	// cin >> tmr;
	while(tmr--){
		fmain();
	}
	
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 0 / 70