oj.uz

답안 #1106433

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1106433 2024-10-30T10:34:17 Z atom Izbori (COCI22_izbori) C++17
40 / 110
 383 ms 6140 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> prf(n + 5);
            for (int i = 1; i <= n; ++i)
                prf[i] = prf[i - 1] + (a[i] == x? 1 : -1);


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

    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

# 결과 실행 시간 메모리 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

# 결과 실행 시간 메모리 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 49 ms 520 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 37 ms 348 KB Output is correct
10 Correct 34 ms 336 KB Output is correct
11 Correct 34 ms 336 KB Output is correct
12 Correct 34 ms 336 KB Output is correct
13 Correct 34 ms 336 KB Output is correct
14 Correct 33 ms 336 KB Output is correct
15 Correct 34 ms 336 KB Output is correct
16 Correct 33 ms 336 KB Output is correct
17 Correct 9 ms 504 KB Output is correct

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 4212 KB Output is correct
2 Correct 30 ms 5308 KB Output is correct
3 Correct 19 ms 3436 KB Output is correct
4 Correct 30 ms 5532 KB Output is correct
5 Correct 30 ms 5820 KB Output is correct
6 Correct 32 ms 6140 KB Output is correct
7 Correct 34 ms 6068 KB Output is correct
8 Correct 36 ms 6076 KB Output is correct
9 Correct 38 ms 6076 KB Output is correct
10 Correct 32 ms 6132 KB Output is correct
11 Correct 39 ms 6076 KB Output is correct

Subtask #4
0 / 70.0

# 결과 실행 시간 메모리 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 49 ms 520 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 37 ms 348 KB Output is correct
10 Correct 34 ms 336 KB Output is correct
11 Correct 34 ms 336 KB Output is correct
12 Correct 34 ms 336 KB Output is correct
13 Correct 34 ms 336 KB Output is correct
14 Correct 33 ms 336 KB Output is correct
15 Correct 34 ms 336 KB Output is correct
16 Correct 33 ms 336 KB Output is correct
17 Correct 9 ms 504 KB Output is correct
18 Correct 21 ms 4212 KB Output is correct
19 Correct 30 ms 5308 KB Output is correct
20 Correct 19 ms 3436 KB Output is correct
21 Correct 30 ms 5532 KB Output is correct
22 Correct 30 ms 5820 KB Output is correct
23 Correct 32 ms 6140 KB Output is correct
24 Correct 34 ms 6068 KB Output is correct
25 Correct 36 ms 6076 KB Output is correct
26 Correct 38 ms 6076 KB Output is correct
27 Correct 32 ms 6132 KB Output is correct
28 Correct 39 ms 6076 KB Output is correct
29 Correct 383 ms 4292 KB Output is correct
30 Incorrect 128 ms 1028 KB Output isn't correct
31 Halted 0 ms 0 KB -