Submission #318787

#	Time	Username	Problem	Language	Result	Execution time	Memory
318787		Wesley_Wang	Cave (IOI13_cave)	C++14	0 / 100	27 ms	492 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>

using namespace std;

int determine[5000];
int correspond[5000];

int ord[5000];

void DoSort (int left, int right)
{
    if (left == right)
    {
        correspond[left] = ord[left];
        return;
    }

    int pivot = tryCombination(determine);
    int pivot_point;

    int r = right;

    for (int i = left; i <= right; i++)
    {
        int o = correspond[i];
        determine[correspond[o]] = !determine[correspond[o]];
        int t = tryCombination(determine);
        if (t != pivot)
        {
            correspond[i] = t;
            if (t > pivot)
                pivot_point = i;
        }
        else
            correspond[i] = r--;
        determine[correspond[o]] = !determine[correspond[o]];
    }
    determine[correspond[pivot_point]] = !determine[correspond[pivot_point]];
    DoSort(pivot + 1, right);
}

void exploreCave(int N) {

    for (int i = 0; i < N; i++)
        determine[i] = rand() % 2;

    for (int i = 0; i < N; i++)
        correspond[i] = i;

    DoSort(0, N);
    answer(determine, correspond);
}

Compilation message (stderr)

cave.cpp: In function 'void DoSort(int, int)':
cave.cpp:39:75: warning: 'pivot_point' may be used uninitialized in this function [-Wmaybe-uninitialized]
   39 |     determine[correspond[pivot_point]] = !determine[correspond[pivot_point]];
      |                                                     ~~~~~~~~~~~~~~~~~~~~~~^

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