Submission #298092

#	Time	Username	Problem	Language	Result	Execution time	Memory
298092		williamMBDK	Cave (IOI13_cave)	C++11	100 / 100	626 ms	764 KiB

cave

#include<bits/stdc++.h>
#include "cave.h"
using namespace std;
const int MAXN = 5000;
int N;
int S[MAXN], temp [MAXN];
int D[MAXN];
bool done[MAXN];
int test(int l, int r){
	for(int i = 0; i < N; i++) temp[i] = S[i];
	for(int i = l; i <= r; i++){
		if(!done[i]) {
			temp[i] = 1;
		}
	}
	return tryCombination(temp);
}
void exploreCave(int _N) {
	N = _N;
	for(int i = 0; i < N; i++) S[i] = 0;
	for(int i = 0; i < N; i++){
		// cout << "finding" << " " << i << endl;
		int l = 0, r = N - 1;
		int val = tryCombination(S);
		// cout << val << endl;
		while(l < r){
			int m = (l + r) / 2;
			// cout << l << " " << r << endl;
			int t = test(l, m);
			if((val == i ? t != i : t == i)){
				r = m;
			}else{
				l = m + 1;
			}
		}
		if(val == i) S[l] = 1;
		else S[l] = 0;
		D[l] = i;
		done[l] = 1;
		// cout << l << " " << S[l] << endl;
		// cout << l << " " << i << endl;
	}
	answer(S, D);
}

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