Submission #673143

#	Time	Username	Problem	Language	Result	Execution time	Memory
673143		KiriLL1ca	Izbori (COCI22_izbori)	C++17	40 / 110	3079 ms	7876 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define fr first
#define sc second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pw(x) (1ll << x)
#define sz(x) (int)((x).size())
#define pb push_back
#define endl '\n'
#define mp make_pair
#define vec vector

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
typedef unsigned long long ull;

template <typename T> inline bool umin (T &a, const T &b) { if (a > b) { a = b; return 1; } return 0; }
template <typename T> inline bool umax (T &a, const T &b) { if (a < b) { a = b; return 1; } return 0; }
template <typename T>
using oset = tree<T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;



struct fen {
        vector <int> t;
        int norm;
        fen (int n = 0) : norm(n >> 1), t(n + 100) {}
        inline void upd (int i, int x) { for (i += norm; i < sz(t); i += (i & -i)) t[i] += x; }
        inline int get (int i) { int res = 0; for (i += norm; i; i -= (i & -i)) res += t[i]; return res; }
        inline int get (int l, int r) { return get(r) - get(l - 1); }
};

inline void solve () {
        int n; cin >> n;
        vector <int> a (n + 1);
        for (int i = 1; i <= n; ++i) cin >> a[i], --a[i];
        map <int, vector <int>> mp;
        for (int i = 1; i <= n; ++i) mp[a[i]].pb(i);

        const int N = n * 4 + 100;
        const int B = 0;
        ll ans = 0;

        /// O(n^2) ! test

        for (auto &[_, pos] : mp) {
                if (sz(pos) > B) {
                        vector <int> c (n + 1);
                        fen t (N); t.upd(0, 1);
                        for (int i = 1; i <= n; ++i) c[i] = c[i - 1] + (a[i] == _ ? +1 : 0);
                        for (int i = 1; i <= n; ++i) {
                                ans += t.get(2 * c[i] - i - 1);
                                t.upd(2 * c[i] - i, 1);
                        }
                }
                else {

                }
        }
        cout << ans;
}

signed main() {
        ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
        #ifdef LOCAL
                freopen("input.txt", "r", stdin);
                freopen("output.txt", "w", stdout);
        #endif
        int t = 1; // cin >> t;
        while (t--) solve();
        return 0;
}

Compilation message (stderr)

Main.cpp: In constructor 'fen::fen(int)':
Main.cpp:33:13: warning: 'fen::norm' will be initialized after [-Wreorder]
   33 |         int norm;
      |             ^~~~
Main.cpp:32:22: warning:   'std::vector<int> fen::t' [-Wreorder]
   32 |         vector <int> t;
      |                      ^
Main.cpp:34:9: warning:   when initialized here [-Wreorder]
   34 |         fen (int n = 0) : norm(n >> 1), t(n + 100) {}
      |         ^~~

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