oj.uz

Submission #1106434

# Submission time Handle Problem Language Result Execution time Memory
1106434 2024-10-30T10:37:10 Z atom Izbori (COCI22_izbori) C++17
40 / 110
 392 ms 6088 KB 
#include "bits/stdc++.h"
// @JASPER'S BOILERPLATE
using namespace std;
using ll = long long;

#ifdef JASPER
#include "debug.h"
#else
#define debug(...) 166
#endif

const int N = 2e5 + 5;
const int B = 450;
int a[N];
int n;

bool sub12() {
    return (n <= 2000);
}

bool sub3() {
    for (int i = 1; i <= n; ++i)
        if (a[i] > 2) return false;
    return true;
}

template <typename T>
struct Fenwick {
    vector <int> f;
    int n;
    Fenwick(int _n) {
        f.resize(_n + 5);
        n = _n;
    }

    void upd(int x, int val) {
        for (; x <= n; x += x & -x)
            f[x] += val;
    }

    int get(int x) {
        int ans = 0;
        for (; x > 0; x -= x & -x)
            ans += f[x];
        return ans;
    }
};

signed main() {
    cin.tie(0) -> sync_with_stdio(0);
    
    #ifdef JASPER
        freopen("in1", "r", stdin);
    #endif

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

    if (sub12()) {
        ll ans = 0;
        for (int l = 1; l <= n; ++l) {
            map <int, int> cnt;
            
            pair <int, int> mx = {0, 0};
            for (int r = l; r <= n; ++r) {
                cnt[a[r]]++;
                if (cnt[a[r]] > mx.second) {
                    mx = make_pair(a[r], cnt[a[r]]);
                }
                if (mx.second > (r - l + 1) / 2) {
                    ++ans;
                }
            }
        }

        cout << ans << "\n";
        return 0;
    }

    if (sub3()) {
        vector <int> prf[3];
        for (int i = 1; i <= 2; ++i)
            prf[i].resize(n + 5);

        for (int i = 1; i <= n; ++i) {
            int x = a[i];
            prf[1][i] = prf[1][i - 1] + (x == 1);
            prf[2][i] = prf[2][i - 1] + (x == 2);
        }

        vector <int> vals[3];
        vals[1].push_back(0);
        vals[2].push_back(0);
        for (int i = 1; i <= n; ++i) {
            vals[1].push_back(2 * prf[1][i] - i);
            vals[2].push_back(2 * prf[2][i] - i);
        }

        sort(vals[1].begin(), vals[1].end());
        vals[1].resize(unique(vals[1].begin(), vals[1].end()) - vals[1].begin());
        sort(vals[2].begin(), vals[2].end());
        vals[2].resize(unique(vals[2].begin(), vals[2].end()) - vals[2].begin());

        auto get = [&] (int x, int t) {
            return (int) (lower_bound(vals[t].begin(), vals[t].end(), x) - vals[t].begin() + 1);
        };

        Fenwick <int> f1(n), f2(n);
        ll ans = 0;
        f1.upd(get(0, 1), 1);
        f2.upd(get(0, 2), 1);
        for (int r = 1; r <= n; ++r) {
            int x1 = get(2 * prf[1][r] - r, 1);
            ans += f1.get(x1 - 1);
            f1.upd(x1, 1);

            int x2 = get(2 * prf[2][r] - r, 2);
            ans += f2.get(x2 - 1);
            f2.upd(x2, 1);
        }

        cout << ans << "\n";
        return 0;
    }

    vector <int> vals;
    for (int i = 1; i <= n; ++i)
        vals.push_back(a[i]);

    sort(vals.begin(), vals.end());
    vals.resize(unique(vals.begin(), vals.end()) - vals.begin());

    int sz = (int) vals.size();
    vector <int> cnt(sz, 0);
    for (int i = 1; i <= n; ++i) {
        a[i] = (int) (lower_bound(vals.begin(), vals.end(), a[i]) - vals.begin());
        cnt[a[i]]++;
    }

    vector <bool> heavy(sz, false);
    for (int i = 0; i < sz; ++i) {
        if (cnt[i] >= B)
            heavy[i] = true;
    }

    ll ans = 0;
    // processing light queries: all elements appear less than sqrt(n)
    cnt.clear();
    for (int i = 1; i <= n; ++i) {
        int mx = 0;
        for (int j = i; j <= n && (j - i + 1) / 2 < B; ++j) {
            if (!heavy[a[j]]) {
                cnt[a[j]]++;
                if (cnt[a[j]] > mx) mx = cnt[a[j]];
                if (mx > (j - i + 1) / 2) ++ans;
            }
        }

        for (int j = i; j <= n && (j - i + 1) / 2 < B; ++j)
            if (!heavy[a[j]]) cnt[a[j]]--;
    }

    // processing heavy queries: all elements appear at least sqrt(n)
    for (int x = 0; x < sz; ++x) {
        if (heavy[x]) {
            auto get = [&] (int _x) { debug(_x); return _x + n; };

            vector <int> f(2 * n + 5, 0);
            int sum = 0;
            int prf = 0;
            f[get(prf)]++;
            for (int i = 1; i <= n; ++i) {
                if (get(prf) > 0)
                    sum += f[get(prf - 1)];
                else    
                    sum -= f[get(prf)];
                ans += sum;
                f[get(prf)]++;
            }
        }
    }

    cout << ans << "\n";

    
    return 0;
}

Compilation message

Main.cpp: In lambda function:
Main.cpp:9:20: warning: statement has no effect [-Wunused-value]
    9 | #define debug(...) 166
      |                    ^~~
Main.cpp:167:39: note: in expansion of macro 'debug'
  167 |             auto get = [&] (int _x) { debug(_x); return _x + n; };
      |                                       ^~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 48 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 33 ms 480 KB Output is correct
10 Correct 33 ms 336 KB Output is correct
11 Correct 34 ms 504 KB Output is correct
12 Correct 33 ms 336 KB Output is correct
13 Correct 33 ms 336 KB Output is correct
14 Correct 33 ms 336 KB Output is correct
15 Correct 33 ms 504 KB Output is correct
16 Correct 33 ms 336 KB Output is correct
17 Correct 10 ms 336 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 4284 KB Output is correct
2 Correct 29 ms 5300 KB Output is correct
3 Correct 17 ms 3436 KB Output is correct
4 Correct 38 ms 5444 KB Output is correct
5 Correct 37 ms 5660 KB Output is correct
6 Correct 47 ms 6068 KB Output is correct
7 Correct 33 ms 6068 KB Output is correct
8 Correct 35 ms 6080 KB Output is correct
9 Correct 32 ms 6072 KB Output is correct
10 Correct 34 ms 6068 KB Output is correct
11 Correct 41 ms 6088 KB Output is correct

Subtask #4
0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 48 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 33 ms 480 KB Output is correct
10 Correct 33 ms 336 KB Output is correct
11 Correct 34 ms 504 KB Output is correct
12 Correct 33 ms 336 KB Output is correct
13 Correct 33 ms 336 KB Output is correct
14 Correct 33 ms 336 KB Output is correct
15 Correct 33 ms 504 KB Output is correct
16 Correct 33 ms 336 KB Output is correct
17 Correct 10 ms 336 KB Output is correct
18 Correct 22 ms 4284 KB Output is correct
19 Correct 29 ms 5300 KB Output is correct
20 Correct 17 ms 3436 KB Output is correct
21 Correct 38 ms 5444 KB Output is correct
22 Correct 37 ms 5660 KB Output is correct
23 Correct 47 ms 6068 KB Output is correct
24 Correct 33 ms 6068 KB Output is correct
25 Correct 35 ms 6080 KB Output is correct
26 Correct 32 ms 6072 KB Output is correct
27 Correct 34 ms 6068 KB Output is correct
28 Correct 41 ms 6088 KB Output is correct
29 Incorrect 392 ms 3524 KB Output isn't correct
30 Halted 0 ms 0 KB -