Submission #1082972

#	Time	Username	Problem	Language	Result	Execution time	Memory
1082972		Mahog	Izbori (COCI22_izbori)	C++17	110 / 110	1779 ms	9068 KiB

Main

#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,fma")
 
#include <bits/stdc++.h>
using namespace std;

struct fenwick {
    vector<int> b;
    int n = 0;
    int m = 0;
    int o = 0;
    
    void start(int x) {
        n = x;
        b.resize(x + 1, o);
    }
    
    void insertVal(int x) {
        m++;
        update(m, x);
    }
        
    void update(int idx, int x) {
    	for (; idx <= n; idx += idx & -idx) b[idx] += x;
    }
    	
    int query1(int idx) {
    	int res = 0;
    	for (; idx > 0; idx -= idx & -idx) res += b[idx];
    	return res;
    }
    
    int query(int l, int r) {
        return query1(r) - query1(l - 1);
    }
};

typedef long long ll;
const int MAX = 2e5 + 2;
const int s = 447;
int a[MAX], p[MAX], cnt[MAX], cnt1[MAX], n;
ll res;
map<int, int> mp;

void solve() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        mp[a[i]]++;
    }
    int m = 0;
    for (auto i : mp) {
        mp[i.first] = ++m;
    }
    for (int i = 1; i <= n; i++) {
        a[i] = mp[a[i]];
        cnt1[a[i]]++;
    }
    for (int i = 1; i <= n; i++) {
        int mx = 0;
        for (int j = i; j <= min(n, i + 2 * s - 1); j++) {
            if (cnt1[a[j]] <= s) {
                cnt[a[j]]++;
                mx = max(mx, cnt[a[j]]);
                if (mx > (j - i + 1 - mx)) res++;
            }
        }
        for (int j = i; j <= min(n, i + 2 * s - 1); j++) {
            if (cnt1[a[j]] <= s) cnt[a[j]]--;
        }
    }
    for (int i = 1; i <= m; i++) {
        if (cnt1[i] <= s) continue;
        p[0] = 0;
        for (int j = 1; j <= n; j++) p[j] = p[j - 1] + (a[j] == i ? 1 : -1);
        for (int j = 0; j <= n; j++) p[j] += n;
        fenwick st;
        st.start(2 * n);
        for (int j = 1; j <= 2 * n; j++) st.insertVal(0);
        st.update(p[0], 1);
        for (int j = 1; j <= n; j++) {
            res += st.query(1, p[j] - 1);
            st.update(p[j], 1);
        }
    }
    cout << res;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
}

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