Submission #894191

#	Time	Username	Problem	Language	Result	Execution time	Memory
894191		ByeWorld	Cave (IOI13_cave)	C++14	100 / 100	219 ms	720 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
using namespace std;
typedef pair<int,int> pii;
const int MAXN = 5e4+10;

int n;
int a[MAXN], con[MAXN], ty[MAXN];
bool skip[MAXN];

bool coba(int idx){
	// for(int i=0; i<4; i++) cout << a[i] << ' ';
	// 	cout << '\n';
	// cout << tryCombination(a) << " depan\n";
	if(tryCombination(a) == idx) return 1;
	return 0;
}
void bin(int idx){
	if(!coba(idx)){ //blm ada 
		for(int i=0; i<n; i++){
			if(skip[i]) continue;
			a[i] = 1-a[i];
		}
	}
	//cout << idx << " idx\n";
	int l=0, r=n-1, mid=0;
    while(l<r){
    	mid = (l+r)/2;
    	for(int i=l; i<=mid; i++){
    		if(skip[i]) continue;
    		a[i] = 1-a[i];
    	}
    	int old_l = l, old_mid = mid;
    	if(coba(idx)) l = mid+1; // ada di kanan
    	else { // ada di kiri
    		r = mid;
		}
		for(int i=old_l; i<=old_mid; i++){ // revert supaya paling depan == idx
    		if(skip[i]) continue;
    		a[i] = 1-a[i];
    	}
    }

    if(l!=r) assert(false);
    con[l] = idx;
    ty[l] = 1-a[l];
    //cout << idx << ' ' << l << ' ' << ty[l] << " ty\n\n";
    skip[l] = 1; a[l] = ty[l];
}
void exploreCave(int N) {
	n = N;
	for(int i=0; i<n; i++){ // find levernya, up or down
		bin(i);
	}
    answer(ty, con);
}

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