제출 #607661

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
607661		jairRS	동굴 (IOI13_cave)	C++17	21 / 100	99 ms	340 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];

int gN;

// returns N instead of -1 when all doors are open
int getLastDoor()
{
    int lastDoor = tryCombination(switches);
    if (lastDoor == -1)
        lastDoor = gN;
    return lastDoor;
}

void exploreCave(int N)
{
    gN = N;

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

        int respSwitch;
        for (int s = 0; s < N; s++)
        {
            switches[s] = !switches[s];
            int queryLastDoor = getLastDoor();
            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);
}

컴파일 시 표준 에러 (stderr) 메시지

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:51:34: warning: 'respSwitch' may be used uninitialized in this function [-Wmaybe-uninitialized]
   51 |             switches[respSwitch] = !switches[respSwitch];
      |             ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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