제출 #866238

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
866238		TAhmed33	Izbori (COCI22_izbori)	C++98	40 / 110	3054 ms	13016 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
inline ll trig (ll x) { return ((x * (x + 1)) >> 1); }
inline ll get2 (ll a, ll b, ll c) {
	a = min(a, c); b = min(b, c);
	c = min(c, a + b);
	return (c - b) * (b + 1) + (c + 1) * (a - c + b + 1) - trig(a) + trig(c - b - 1);
}
const int MAXN = 2e5 + 25;
ll arr[MAXN], n;
vector <ll> occ[MAXN];
vector <int> d;
ll a[2 * MAXN + 25];
ll solve1 (int x) {
	memset(a, 0, sizeof(a));
	ll ret = 0; ll cur = 0; ll sum = 0; a[MAXN] = 1;
	for (int i = 1; i <= n; i++) {
		if (arr[i] == x) {
			sum++; cur += a[sum - 1 + MAXN];
		} else {
			cur -= a[sum - 1 + MAXN]; sum--;
		}
		ret += cur; a[sum + MAXN]++;
	}
	return ret;
}
ll solve2 (ll x) {
	ll ret = (ll)occ[x].size();
	for (ll i = 0; i < (ll)occ[x].size() - 1; i--) {
		for (ll j = i + 1; j < (ll)occ[x].size(); j++) {
			ret += get2(occ[x][i] - (i == 0 ? 0 : occ[x][i - 1]), (j == (ll)occ[x].size() - 1 ? n + 1 : occ[x][j + 1]) - occ[x][j], 2 * (j - i + 1) - 2 - occ[x][j] + occ[x][i]);
		}
	}
	return ret;
}
int main () {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> arr[i];
		d.push_back(arr[i]);
	}
	sort(d.begin(), d.end()); d.resize(unique(d.begin(), d.end()) - d.begin());
	for (int i = 1; i <= n; i++) arr[i] = lower_bound(d.begin(), d.end(), arr[i]) - d.begin();
	for (int i = 1; i <= n; i++) {
		occ[arr[i]].push_back(i);
	}

	ll sum = 0;
	ll x = sqrt(n); while (x * x < n) x++; while (x * x > n) x--;
	for (int i = 0; i < n; i++) {
		if (occ[i].empty()) continue;
		if ((ll)occ[i].size() > x / 20) sum += solve1(i);
		else {
			sum += solve2(i);
		}
	}
	cout << sum << '\n';
}

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