Submission #1132986

#	Time	Username	Problem	Language	Result	Execution time	Memory
1132986		heey	Cave (IOI13_cave)	C++20	100 / 100	162 ms	528 KiB

cave

#include <bits/stdc++.h>
using namespace std;
#include "cave.h"

void exploreCave(int n){
	int s[n], d[n];
	for(int i = 0; i < n; i++) s[i] = 0, d[i] = 0;


	vector<bool> known(n, false);
	int cr[n];

	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++) {
			if(!known[j]) s[j] = 0;
			else s[j] = cr[j];
		}


		int calm = tryCombination(s);
		if(calm == i) calm = -1;
		else calm = 1;

		int l = 0, r = n-1;
		int res = calm;
		while(l < r){
			int m = (l+r+1)>>1;
			for(int j = m; j <= r; j++){
				if(!known[j]) s[j] = !s[j];
				else s[j] = cr[j];
			}

			res = tryCombination(s);
			if(res == i) res = -1;
			else res = 1;
			
			if(res != calm){
				l = m;
			}
			else{
				r = m-1;
			}

			calm = res;
		}

		r = max(r, 0);
		d[r] = i;
		if(res == -1) cr[r] = !s[r];
		else cr[r] = s[r];
		known[r] = true;
	}


	answer(cr, d);
}

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