Submission #718626

#	Time	Username	Problem	Language	Result	Execution time	Memory
718626		baojiaopisu	Carnival Tickets (IOI20_tickets)	C++14	100 / 100	761 ms	76236 KiB

tickets

#include "tickets.h"
#include<bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;
using ull = unsigned long long;

using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;

#define fi first
#define se second
#define left BAO
#define right ANH
#define pb push_back
#define pf push_front
#define mp make_pair
#define ins insert
#define btpc __builtin_popcount
#define btclz __builtin_clz

#define sz(x) (int)(x.size());
#define all(x) x.begin(), x.end()
#define debug(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int d4x[4] = {1, 0, -1, 0}; int d4y[4] = {0, 1, 0, -1};
int d8x[8] = {0, 1, 1, 1, 0, -1, -1, -1};
int d8y[8] = {1, 1, 0, -1, -1, -1, 0, 1};

template<class X, class Y>
    bool minimize(X &x, const Y &y) {
        if (x > y)
        {
            x = y;
            return true;
        }
        return false;
    }
template<class X, class Y>
    bool maximize(X &x, const Y &y) {
        if (x < y)
        {
            x = y;
            return true;
        }
        return false;
    }

const int MOD = 1e9 + 7; //998244353

template<class X, class Y>
	void add(X &x, const Y &y) {
		x = (x + y);
		if(x >= MOD) x -= MOD;
	}

template<class X, class Y> 
	void sub(X &x, const Y &y) {
		x = (x - y);
		if(x < 0) x += MOD;
	}

/* Author : Le Ngoc Bao Anh, 12A5, LQD High School for Gifted Student*/

const ll INF = 1e9;
const int N = 1e5 + 10;

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

	for(int i = 0; i < n; i++) {
		l[i] = 0; r[i] = m - 1;
	}

	vector<vector<int>> ans(n, vector<int>(m, -1));
	ll res = 0;
	for(int i = 0; i < n; i++) {
		for(int j = m - 1; j >= m - k; j--) res += a[i][j];
	}
	
	set<pii> s;
	for(int i = 0; i < n; i++) {
		s.ins(mp(a[i][0] + a[i][m - k], i));
		r[i] = m - 1;
	}

	for(int i = 1; i <= n * k / 2; i++) {
		auto iter = s.begin();
		int id = (*iter).se;
		s.erase(iter);
		res -= a[id][l[id]] + a[id][m - k + l[id]];
		++l[id];
		if(l[id] < k) s.ins(mp(a[id][l[id]] + a[id][m - k + l[id]], id));
	}

	for(int i = 0; i < n; i++) l[i]--;
	for(int i = 0; i < k; i++) {
		vector<int> pos;
		for(int j = 0; j < n; j++) pos.pb(j);
		sort(all(pos), [&](int x, int y) {
			return l[x] > l[y];
		});
		for(int j = 0; j < n / 2; j++) {
			int x = pos[j];
			ans[x][l[x]] = i;
			l[x]--; 
		}
		for(int j = n / 2; j < n; j++) {
			int x = pos[j];
			ans[x][r[x]] = i;
			r[x]--;
		}
	}
	allocate_tickets(ans);
	return res;
}

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23
• Subtask 7: 10 / 10