Submission #564501

#	Time	Username	Problem	Language	Result	Execution time	Memory
564501		cpp219	Cave (IOI13_cave)	C++17	100 / 100	213 ms	652 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
 
using namespace std;
 
const int N = 5e3+5; 
 
int n;
int S[N], D[N];
bool chk[N];
 
void exploreCave(int N) {
	n = N;
	for(int i = 0; i < n; i++) {
		int init = tryCombination(S);
		bool t = (init == -1 || init > i);
		int l = 0, r = n-1;
		while(l < r) {
			int m = (l + r) >> 1;
			for(int j = l; j <= m; j++) if(!chk[j]) S[j] ^= 1;
			int ret = tryCombination(S);
			bool now = (ret == -1 || ret > i);
			if(t ^ now) r = m, t = now;
			else l = m+1;
		}
		if(!t) S[r] ^= 1;
		D[r] = i, chk[r] = true;
	}
	answer(S, D);
}

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