제출 #1197981

#제출 시각아이디문제언어결과실행 시간메모리
1197981countless카니발 티켓 (IOI20_tickets)C++20
0 / 100
0 ms328 KiB
#include "tickets.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()
#define sz(x) ((ll)(x).size())

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);

ll find_maximum(int k, vector<vector<int>> x) {
	ll n = x.size();
	ll m = x[0].size();

	ll ans = 0;

	// sort by val, keep track of pos
	vector<vector<int>> pos(n, vector<int>(m));
	REP(i, 0, n) {
		REP(j, 0, m) {
			pos[i][j] = j;
		}

		sort(all(pos[i]), [&](const int &a, const int &b) -> bool {
			return x[i][a] < x[i][b];
		});
	}

	auto find = [&](const int &i, const int &j) {
		return x[i][pos[i][j]];
	};

	// [val, color]
	priority_queue<pair<int, int>> pq;

	// track max's and min's
	vector<int> add(n, 0), sub(n, 0);

	// b will always be median
	// ans will always be greatest n/2 minus smallest n/2
	REP(i, 0, n) {
		// take smallest k
		REP(j, 0, k) {
			ans -= find(i, j);
		}

		pq.push({find(i, m-1) + find(i, k-1), i});
	}
	
	// take greatest n/2 paired with its smallest to balance sum properly
	REP(i, 0, n * k / 2) {
		pair<int, int> cand = pq.top(); pq.pop();
		ans += cand.first;

		// cap is at k tickets per color
		add[cand.second]++;
		if (add[cand.second] < k) {
			pq.push({find(cand.second, m-1-add[cand.second]) + find(cand.second, k-1-add[cand.second]), cand.second});
		}
	}

	priority_queue<pair<int, int>>().swap(pq);
	vector<vector<int>> g(n, vector<int>(m, -1));
	vector<bool> use(n, false);

	// [cnt, color]
	REP(i, 0, n) {
		pq.push({add[i], i});
	}

	// apply
	// REP(i, 0, k) {
	// 	fill(all(use), false);

	// 	// n/2 colors take max, n/2 colors take min
	// 	REP(j, 0, n / 2) {
	// 		pair<int, int> cand = pq.top(); pq.pop();
	// 		use[cand.second] = true;
	// 	}

	// 	REP(j, 0, n) {
	// 		if (use[j]) {
	// 			g[j][pos[j][m-add[j]]] = i;
	// 			add[j]--;
	// 			pq.push({add[j], j});
	// 		} else {
	// 			g[j][pos[j][sub[j]]] = i;
	// 			sub[j]++;
	// 		}
	// 	}
	// }

	allocate_tickets(g);

	return ans;
}
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