Submission #529388

#	Time	Username	Problem	Language	Result	Execution time	Memory
529388		flappybird	Dancing Elephants (IOI11_elephants)	C++14	100 / 100	8087 ms	35920 KiB

elephants

#include "elephants.h"
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,fma")
using namespace std;

typedef long long ll;
typedef pair<int, int> pi;
#define MAX 150010
#define INF 1000000010
#define B 300

int N;
int L;
int arr[MAX];
int cnt;
map<int, int> ncnt;
int gcnt;
set<int> allv;
vector<pair<int, pi>> bukkit[MAX];

inline bool cmpp(const pair<int, pi>& p1, const pair<int, pi>& p2) {
	return p1.first < p2.first;
}

//refresh bukkit
void refb(int b) {
	if (bukkit[b].empty()) return;
	while (bukkit[b].size() && bukkit[b].back().first == INF) bukkit[b].pop_back();
	int i;
	int ub = bukkit[b].size();
	for (i = bukkit[b].size() - 1; i >= 0; i--) {
		int x = bukkit[b][i].first;
		int e = x + L;
		while (ub && bukkit[b][ub - 1].first > e) ub--;
		if (ub == bukkit[b].size()) bukkit[b][i].second = pi(1, e);
		else bukkit[b][i].second = pi(bukkit[b][ub].second.first + 1, bukkit[b][ub].second.second);
	}
}

void ref() {
	for (int i = 0; i < gcnt; i++) bukkit[i].clear();
	gcnt = 0;
	for (auto v : allv) {
		if (bukkit[gcnt].size() == B) gcnt++;
		bukkit[gcnt].push_back(make_pair(v, pi(0, 0)));
	}
	gcnt++;
	for (int i = 0; i < gcnt; i++) refb(i);
}

int calc() {
	int en = -2, i;
	int cnt = 0;
	for (i = 0; i < gcnt; i++) {
		if (bukkit[i].empty()) continue;
		auto ub = lower_bound(bukkit[i].begin(), bukkit[i].end(), make_pair(en + 1, pi(0, 0)), cmpp) - bukkit[i].begin();
		if (ub == bukkit[i].size()) continue;
		cnt += bukkit[i][ub].second.first;
		en = bukkit[i][ub].second.second;
	}
	return cnt;
}

void init(int N, int L, int X[]) {
	::N = N;
	::L = L;
	int i;
	for (i = 0; i < N; i++) arr[i] = X[i], allv.insert(arr[i]), ncnt[arr[i]]++;
	ref();
}

int update(int i, int y) {
	cnt++;
	if (cnt == B) ref(), cnt = 0;
	int x = arr[i];
	arr[i] = y;
	ncnt[x]--;
	if (ncnt[x] == 0) {
		int i, ind = 0;
		for (i = 0; i < gcnt; i++) if (bukkit[i].size() && bukkit[i].begin()->first <= x) ind = i;
		int it = lower_bound(bukkit[ind].begin(), bukkit[ind].end(), make_pair(x, pi(0, 0)), cmpp) - bukkit[ind].begin();
		bukkit[ind].erase(bukkit[ind].begin() + it);
		allv.erase(x);
		refb(ind);
	}
	if (ncnt[y] == 0) {
		allv.insert(y);
		int i, ind = 0;
		for (i = 0; i < gcnt; i++) if (bukkit[i].size() && bukkit[i].begin()->first <= y) ind = i;
		int nind;
		nind = lower_bound(bukkit[ind].begin(), bukkit[ind].end(), make_pair(y, pi(0, 0))) - bukkit[ind].begin();
		bukkit[ind].insert(bukkit[ind].begin() + nind, make_pair(y, pi(0, 0)));
		allv.insert(y);
		refb(ind);
	}
	ncnt[y]++;
	return calc();
}

Compilation message (stderr)

elephants.cpp: In function 'void refb(int)':
elephants.cpp:38:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |   if (ub == bukkit[b].size()) bukkit[b][i].second = pi(1, e);
      |       ~~~^~~~~~~~~~~~~~~~~~~
elephants.cpp: In function 'int calc()':
elephants.cpp:60:10: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |   if (ub == bukkit[i].size()) continue;
      |       ~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 16 / 16
• Subtask 3: 24 / 24
• Subtask 4: 47 / 47
• Subtask 5: 3 / 3