Submission #1200037

#TimeUsernameProblemLanguageResultExecution timeMemory
1200037countlessSequence (APIO23_sequence)C++20
0 / 100
2096 ms31260 KiB
#include "sequence.h" #include <bits/stdc++.h> using namespace std; typedef long long ll; typedef long double ld; const ll MOD = 998244353; const ll INF = 1e18; const ld EPS = 1e-12; #define endl "\n" #define sp <<" "<< #define REP(i, a, b) for(ll i = a; i < b; i++) #define dbg(x) cout << #x << " = " << x << endl #define mp make_pair #define pb push_back #define fi first #define se second #define fast_io() ios_base::sync_with_stdio(false); cin.tie(NULL) #define all(x) (x).begin(), (x).end() #define rall(x) (x).rbegin(), (x).rend() struct custom_hash { static uint64_t splitmix64(uint64_t x) { // http://xorshift.di.unimi.it/splitmix64.c x += 0x9e3779b97f4a7c15; x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9; x = (x ^ (x >> 27)) * 0x94d049bb133111eb; return x ^ (x >> 31); } size_t operator()(uint64_t x) const { static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count(); return splitmix64(x + FIXED_RANDOM); } }; template <typename Key, typename Value> using hash_map = unordered_map<Key, Value, custom_hash>; mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); // uniform_int_distribution<int>(a, b)(rng); // shuffle(all(a), rng); int sequence(int N, vector<int> A) { // brute force int ans = 0; int med1, med2; REP(i, 0, N) { vector<int> temp; hash_map<int, int> cnt; REP(j, i, N) { temp.push_back(A[j]); cnt[A[j]]++; if (A[i] != A[j]) continue; int sz = j - i + 1; if (sz % 2 == 0) { nth_element(temp.begin(), temp.begin() + sz / 2, temp.end()); nth_element(temp.begin(), temp.begin() + (sz - 1) / 2, temp.end()); med1 = temp[(sz - 1) / 2]; med2 = temp[sz / 2]; ans = max(ans, cnt[med1]); ans = max(ans, cnt[med2]); } else { nth_element(temp.begin(), temp.begin() + sz / 2, temp.end()); med2 = temp[sz / 2]; ans = max(ans, cnt[med2]); } } } return ans; }
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