Submission #421321

#	Time	Username	Problem	Language	Result	Execution time	Memory
421321		errorgorn	Cave (IOI13_cave)	C++17	100 / 100	281 ms	580 KiB

cave

#include "cave.h"
#include <cstdio>
#include <vector>
using namespace std;
int n;
int door[5005];
int button[5005];
int temp[5005];
vector<int> left;
void test(int  i){
	if (tryCombination(button)!=i){
		for (int x=0;x<left.size();x++) button[left[x]]^=1;
	}
	int l=0,r=left.size()-1,m;
	while (l!=r){
		m=(l+r)>>1;
		for (int x=0;x<n;x++){
			temp[x]=button[x];
		}
		for (int x=l;x<=m;x++){
			temp[left[x]]^=1;
		}
		if (tryCombination(temp)==i){
			l=m+1;
		}
		else{
			r=m;
		}
	}
	door[left[l]]=i;
	button[left[l]]^=1;
	left.erase(left.begin()+l);
}
void exploreCave(int N) {
	n=N;
	for (int x=0;x<n;x++){
		door[x]=x;
		left.push_back(x);
	}
	for (int x=0;x<n;x++){
		test(x);
	}
	answer(button,door);
}

Compilation message (stderr)

cave.cpp: In function 'void test(int)':
cave.cpp:12:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |   for (int x=0;x<left.size();x++) button[left[x]]^=1;
      |                ~^~~~~~~~~~~~

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