Submission #132058

#	Time	Username	Problem	Language	Result	Execution time	Memory
132058		junodeveloper	Cave (IOI13_cave)	C++14	51 / 100	360 ms	640 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
#define sz(x) (int)x.size()
using namespace std;
int S[5010], D[5010], cur, idx, W, n;
int Try() {
	int r = tryCombination(S);
	return r == -1 ? n : r;
}
void FindAll(int s, int e) {
	vector<int> a;
	for(int i=s; i<=e; i++)
		if(D[i] == -1) a.push_back(i);
	int B = (int)sqrt(sz(a));

	if(s == 0 && e == n - 1) B = (sz(a) + 9) / 10;
	else B = (sz(a) + 1) / 2;

	for(int i=0; i<sz(a); i+=B) {
		int rgt = min(sz(a), i+B);
		for(int j=i; j<rgt; j++) S[a[j]] ^= 1;
		int r = Try();
		for(int j=i; j<rgt; j++) S[a[j]] ^= 1;
		if(r != idx) {
			if(B == 1) {
				if(idx < r) { 
					D[a[i]] = idx;
					W = a[i];
				} else if(r < idx) D[a[i]] = r;
			} else FindAll(a[i], a[rgt - 1]);
		}
	}
}
void exploreCave(int N) {
  	n = N;
	srand(123);
	memset(D, -1, sizeof(D));
	for(int i=0; i<N; i++) S[i] = rand() % 2;
	cur = 0;
	while(cur < N) {
		idx = Try();
		FindAll(0, n - 1);
		if(idx < n) S[W] ^= 1;
		cur = idx + 1;
	}
	answer(S, D);
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 0 / 24