Submission #524242

#	Time	Username	Problem	Language	Result	Execution time	Memory
524242		CSQ31	Cave (IOI13_cave)	C++17	100 / 100	787 ms	584 KiB

cave

#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <iostream>
#include "cave.h"
using namespace std;
void exploreCave(int n) {
	int a[n],s[n];
	vector<int>c;
	for(int i=0;i<n;i++){
		c.push_back(i);
		a[i] = 0;
	}
	for(int i=0;i<n;i++){
		int res = tryCombination(a);
		int m = c.size();
		if(res!= -1 && res <= i){
			int l = 0,r = m-1;
			while(r>l){
				int mid = (l+r)/2;
				for(int j=0;j<=mid;j++)a[c[j]]^=1;
				int cc = tryCombination(a);
				if(cc==-1 || cc>i)r = mid;
				else l = mid+1;
				for(int j=0;j<=mid;j++)a[c[j]]^=1;
			}
			s[i] = c[r];
			a[c[r]]^=1;
			c.erase(c.begin() + r);
		}else{
			int l = 0,r = m-1;
			while(r>l){
				int mid = (l+r)/2;
				for(int j=0;j<=mid;j++)a[c[j]]^=1;
				int cc = tryCombination(a);
				if(cc!=-1 && cc<=i)r = mid;
				else l = mid+1;
				for(int j=0;j<=mid;j++)a[c[j]]^=1;
			}
			s[i] = c[r];
			c.erase(c.begin() + r);
		}
	}
	int b[n];
	for(int i=0;i<n;i++)b[s[i]] = i;
	answer(a,b);
}

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