Submission #302082

#	Time	Username	Problem	Language	Result	Execution time	Memory
302082		BlancaHM	Cave (IOI13_cave)	C++14	100 / 100	366 ms	640 KiB

cave

#include "cave.h"
#include <iostream>
#include <fstream>
#include <cfloat>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <queue>
#include <stack>
#include <cstring>
#include <cmath>
#include <climits>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
using namespace std;
typedef pair<int, int> pii;
typedef long long int ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
typedef vector<vvvi> vvvvi;
typedef vector<pii> vpii;
typedef vector<vpii> vvpii;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<vvvl> vvvvl;
typedef vector<string> vs;
#define fir first
#define sec second
#define pb push_back
#define eb emplace_back
#define ppb pop_back
#define pf push_front
#define ppf pop_front
#define mp make_pair
#define len(v) ((int)v.size())
#define all(v) v.begin(), v.end()

void flip(int & a) {
	a = 1 - a;
}

void exploreCave(int N) {
	int finalS[N], finalD[N], switchComb[N];
	memset(finalS, -1, sizeof(finalS));
	memset(finalD, -1, sizeof(finalD));
	memset(switchComb, 0, sizeof(switchComb));
	int val, curVal, lo, hi, mid;
	if (N == 1) {
		val = tryCombination(switchComb);
		if (val == 0) finalS[0] = 1;
		else finalS[0] = 0;
		finalD[0] = 0;
		answer(finalS, finalD);
		return;
	}
	pii ans = mp(0, 0);
	for (int i = 0; i < N; i++) {
		val = tryCombination(switchComb);
		if (val == -1) val = N;
		lo = 0;
		hi = N-1;
		while(lo < hi) {
			mid = lo + (hi-lo)/2;
			for (int j = lo; j <= mid; j++) if (finalD[j] == -1) flip(switchComb[j]);
			curVal = tryCombination(switchComb);
			for (int j = lo; j <= mid; j++) if (finalD[j] == -1) flip(switchComb[j]);
			if (curVal == -1) curVal = N;
			if (curVal > i) {
				if (val <= i) {
					hi = mid;
					ans = mp(mid, 1 - switchComb[mid]);
				} else {
					lo = mid+1;
					ans = mp(mid+1, switchComb[mid+1]);
				}
			} else {
				if (val <= i) {
					lo = mid+1;
					ans = mp(mid+1, 1-switchComb[mid+1]);
				}
				else {
					hi = mid;
					ans = mp(mid, switchComb[mid]);
				}
			}
		}
		finalD[ans.first] = i;
		finalS[ans.first] = ans.second;
		switchComb[ans.first] = ans.second;
	}
	answer(finalS, finalD);
}

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24