Submission #1164476

#	Time	Username	Problem	Language	Result	Execution time	Memory
1164476		pb2008	Izbori (COCI22_izbori)	C++20	40 / 110	3095 ms	3548 KiB

Main

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

#pragma GCC optimize ("Ofast,unroll-loops")
#pragma GCC target ("tune=native,avx2")

const int N = 2e5 + 5, T = 1800;
bool mark[N];
long long ans;
int n, a[N], cnt[N], seg[N << 1];

void readInput();
void compress();
void pre();
void add(int i);
int get(int i);
long long calc1(int x);
long long calc2(int x);
void solve();
void writeOutput();

int main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    readInput();
    solve();
    writeOutput();
    return 0;
}

void readInput() {
    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> a[i];
}

void compress() {
    vector<pair<int, int>> v;
    for (int i = 0; i < n; i++)
        v.push_back({a[i], i});
    int tmp = 0;
    sort(v.begin(), v.end());
    for (int i = 0; i < n - 1; i++)
        a[v[i].second] = tmp, tmp += (v[i].first != v[i + 1].first);
    a[v[n - 1].second] = tmp;
}

void pre() {
    compress();
    for (int i = 0; i < n; i++)
        cnt[a[i]]++;
}

void add(int i) {
    for (; i <= (n << 1 | 1); i += (i & -i))
        seg[i]++;
}

int get(int i) {
    int res = 0;
    for (; i; i -= (i & -i))
        res += seg[i];
    return res;
}

long long calc1(int x) {
    long long res = 0;
    for (int len = 1; len <= min(2 * cnt[x], n); len++) {
        int num = 0;
        for (int i = 0; i < n; i++) {
            if (i < len)
                num += (a[i] == x);
            else {
                res += ((len / 2) < num);
                num += (a[i] == x) - (a[i - len] == x);
            }
        }
        res += ((len / 2) < num);
    }
    return res;
}

long long calc2(int x) {
    int sum = 0;
    long long res = 0;
    memset(seg, 0, sizeof seg);
    for (int i = 0; i < n; i++) {
        sum += 1 - 2 * (a[i] != x);
        res += get(sum + n) + (0 < sum), add(sum + n + 1);
    }
    return res;
}

void solve() {
    pre();
    for (int i = 0; i < n; i++) {
        if (mark[a[i]]) continue;
        mark[a[i]] = true;
        if (cnt[a[i]] < T)
            ans += calc1(a[i]);
        else
            ans += calc2(a[i]);
    }
}

void writeOutput() {
    cout << ans;
}

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