Submission #907477

#	Time	Username	Problem	Language	Result	Execution time	Memory
907477		vjudge1	Izbori (COCI22_izbori)	C++17	25 / 110	31 ms	6092 KiB

Main

#include<bits/stdc++.h>

using namespace std;


int n, a[200001], num = 0, cnt[200001], sz = 2, cnt2[200001], res = 0, c[200001], pfs[200001], dp[200001], sl[400001];
pair<int, int> b[200001];
vector<int> v;
bool check[200001];

bool cmp(pair<int, int> a, pair<int, int> b) {
    return a.second < b.second;
}

signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        b[i].first = a[i];
        b[i].second = i;
    }
    int last = -1;
    sort(b + 1, b + 1 + n);
    for (int i = 1; i <= n; i++) {
        int l2 = b[i].first;
        if(b[i].first == last) b[i].first = num;
        else b[i].first = ++num;
        last = l2;
    }
    sort(b + 1, b + 1 + n, cmp);
    for (int i = 1; i <= n; i++) {
        a[i] = b[i].first;
        cnt[a[i]]++;
        if(cnt[a[i]] > sz && !check[a[i]]) {
            v.push_back(a[i]);
            check[a[i]] = true;
        }
    }
    for (int i = 1; i <= n; i++) {
        int mx = 1;
        for (int j = i; j <= min(i + 2 * sz - 1, n); j++) {
            num = j - i + 1;
            if(cnt[a[j]] <= sz) {
                cnt2[a[j]]++;
                mx = max(mx, cnt2[a[j]]);
                if(mx > num / 2) res++;
            }
        }
        for (int j = i; j <= min(i + 2 * sz - 1, n); j++) {
            if(cnt[a[j]] < sz) cnt2[a[j]]--;
        }
    }
    for (int i = 0; i < v.size(); i++) {
        int bnum = v[i];
        pfs[0] = n;
        sl[n] = 1;
        for (int j = 1; j <= n; j++) {
            if(a[j] == bnum) c[j] = 1;
            else c[j] = -1;
            pfs[j] = pfs[j - 1] + c[j];
            if(pfs[j] > pfs[j - 1]) {
                dp[j] = dp[j - 1] + sl[pfs[j - 1]];
            }
            else {
                dp[j] = dp[j - 1] - sl[pfs[j]];
            }
            sl[pfs[j]]++;
            res += dp[j];
        }
        for (int j = 1; j <= n; j++) {
            sl[pfs[j]] = 0;
        }
    }
    cout << res << '\n';
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for (int i = 0; i < v.size(); i++) {
      |                     ~~^~~~~~~~~~

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