Submission #607659

#	Time	Username	Problem	Language	Result	Execution time	Memory
607659		jairRS	Cave (IOI13_cave)	C++17	0 / 100	108 ms	360 KiB

cave

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

const int MAXN = 5'000;
int switches[MAXN];

// door triggered by switchID
int door[MAXN];

void exploreCave(int N)
{
    // doors up to curDoor EXCEPT curDoor are open
    for (int curDoor = 0; curDoor < N; curDoor++)
    {
        int lastDoor = tryCombination(switches);
        int doorOpen = lastDoor > curDoor;

        int respSwitch;
        for (int s = 0; s < N; s++)
        {
            switches[s] = !switches[s];
            int queryLastDoor = tryCombination(switches);
            if (queryLastDoor == -1)
                queryLastDoor = N;
            switches[s] = !switches[s];

            if (doorOpen)
            {
                if (queryLastDoor == curDoor)
                    respSwitch = s;
            }
            else if (queryLastDoor > curDoor)
                respSwitch = s;
        }
        door[respSwitch] = curDoor;

        if (!doorOpen)
            switches[respSwitch] = !switches[respSwitch];
    }

    answer(switches, door);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:40:34: warning: 'respSwitch' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |             switches[respSwitch] = !switches[respSwitch];
      |             ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24