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Submission #883462

# Submission time Handle Problem Language Result Execution time Memory
883462 2023-12-05T10:00:38 Z borisAngelov Izbori (COCI22_izbori) C++17
110 / 110
 990 ms 43684 KB 
#include <bits/stdc++.h>

using namespace std;

const int maxn = 200005;

int n;

int a[maxn];

vector<int> byPosition[maxn];

void read()
{
    cin >> n;

    for (int i = 1; i <= n; ++i)
    {
        cin >> a[i];
    }
}

int b[maxn];
int pref[maxn];

long long divideAndConquer(int l, int r)
{
    if (l > r)
    {
        return 0;
    }

    if (l == r)
    {
        return 1;
    }

    int mid = (l + r) / 2;

    set<int> candidates;
    unordered_map<int, int> cnt;

    for (int i = mid - 1; i >= l; --i)
    {
        ++cnt[a[i]];

        if (cnt[a[i]] > (mid - i) / 2)
        {
            candidates.insert(a[i]);
        }
    }

    cnt.clear();

    for (int i = mid; i <= r; ++i)
    {
        ++cnt[a[i]];

        if (cnt[a[i]] > (i - mid + 1) / 2)
        {
            candidates.insert(a[i]);
        }
    }

    long long ans = 0;

    for (auto currentCandidate : candidates)
    {
        for (int i = l; i <= r; ++i)
        {
            if (a[i] == currentCandidate)
            {
                b[i] = +1;
            }
            else
            {
                b[i] = -1;
            }
        }

        cnt.clear();

        int sum = 0;
        ++cnt[sum];

        for (int i = l; i <= mid - 1; ++i)
        {
            sum += b[i];
            ++cnt[sum];
        }

        int upTo = (r - l + 1);

        for (int i = -upTo; i <= upTo; ++i)
        {
            cnt[i] += cnt[i - 1];
        }

        for (int i = mid; i <= r; ++i)
        {
            sum += b[i];
            ans += cnt[sum - 1];
        }
    }

    return ans + divideAndConquer(l, mid - 1) + divideAndConquer(mid + 1, r);
}

void solve()
{
    cout << divideAndConquer(1, n) << endl;
}

void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int main()
{
    fastIO();

    read();
    solve();

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 2 ms 6492 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 2 ms 6492 KB Output is correct
6 Correct 2 ms 6492 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 2 ms 6492 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 2 ms 6492 KB Output is correct
6 Correct 2 ms 6492 KB Output is correct
7 Correct 4 ms 6748 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 7 ms 6744 KB Output is correct
10 Correct 7 ms 6748 KB Output is correct
11 Correct 8 ms 6748 KB Output is correct
12 Correct 7 ms 6748 KB Output is correct
13 Correct 7 ms 6748 KB Output is correct
14 Correct 7 ms 6748 KB Output is correct
15 Correct 7 ms 6748 KB Output is correct
16 Correct 7 ms 6744 KB Output is correct
17 Correct 4 ms 6748 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 570 ms 29052 KB Output is correct
2 Correct 785 ms 37472 KB Output is correct
3 Correct 425 ms 24956 KB Output is correct
4 Correct 826 ms 40892 KB Output is correct
5 Correct 858 ms 41660 KB Output is correct
6 Correct 876 ms 43368 KB Output is correct
7 Correct 886 ms 43600 KB Output is correct
8 Correct 883 ms 43348 KB Output is correct
9 Correct 880 ms 43204 KB Output is correct
10 Correct 884 ms 43368 KB Output is correct
11 Correct 524 ms 43200 KB Output is correct

Subtask #4
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 2 ms 6492 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 2 ms 6492 KB Output is correct
6 Correct 2 ms 6492 KB Output is correct
7 Correct 4 ms 6748 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 7 ms 6744 KB Output is correct
10 Correct 7 ms 6748 KB Output is correct
11 Correct 8 ms 6748 KB Output is correct
12 Correct 7 ms 6748 KB Output is correct
13 Correct 7 ms 6748 KB Output is correct
14 Correct 7 ms 6748 KB Output is correct
15 Correct 7 ms 6748 KB Output is correct
16 Correct 7 ms 6744 KB Output is correct
17 Correct 4 ms 6748 KB Output is correct
18 Correct 570 ms 29052 KB Output is correct
19 Correct 785 ms 37472 KB Output is correct
20 Correct 425 ms 24956 KB Output is correct
21 Correct 826 ms 40892 KB Output is correct
22 Correct 858 ms 41660 KB Output is correct
23 Correct 876 ms 43368 KB Output is correct
24 Correct 886 ms 43600 KB Output is correct
25 Correct 883 ms 43348 KB Output is correct
26 Correct 880 ms 43204 KB Output is correct
27 Correct 884 ms 43368 KB Output is correct
28 Correct 524 ms 43200 KB Output is correct
29 Correct 566 ms 43200 KB Output is correct
30 Correct 172 ms 12648 KB Output is correct
31 Correct 352 ms 18900 KB Output is correct
32 Correct 954 ms 41888 KB Output is correct
33 Correct 383 ms 19652 KB Output is correct
34 Correct 400 ms 21444 KB Output is correct
35 Correct 259 ms 16324 KB Output is correct
36 Correct 140 ms 12132 KB Output is correct
37 Correct 179 ms 12896 KB Output is correct
38 Correct 990 ms 43232 KB Output is correct
39 Correct 937 ms 43524 KB Output is correct
40 Correct 986 ms 43684 KB Output is correct
41 Correct 970 ms 43260 KB Output is correct
42 Correct 987 ms 43196 KB Output is correct
43 Correct 962 ms 43200 KB Output is correct
44 Correct 966 ms 43196 KB Output is correct
45 Correct 954 ms 43200 KB Output is correct
46 Correct 963 ms 43344 KB Output is correct
47 Correct 958 ms 43172 KB Output is correct
48 Correct 943 ms 43452 KB Output is correct
49 Correct 938 ms 43476 KB Output is correct
50 Correct 921 ms 43196 KB Output is correct
51 Correct 934 ms 43344 KB Output is correct
52 Correct 926 ms 43452 KB Output is correct
53 Correct 915 ms 43600 KB Output is correct
54 Correct 914 ms 43172 KB Output is correct