Submission #143143

#	Time	Username	Problem	Language	Result	Execution time	Memory
143143		daniel920712	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	33 ms	3580 KiB

shoes

#include <iostream>
#include <stdio.h>
#include <vector>
#include <algorithm>
#include <assert.h>

using namespace std;
int all[15];
int S1[1005];
bool F(int a,int b)
{
    return a<b;
}
long long count_swaps(std::vector<int> S)
{
    long long ans1=0,ans2=1e18,N=S.size(),i,j,k,now=0;
    long long t;
    for(i=0;i<N;i++) if(S[i]>0) all[now++]=S[i];
    sort(all,all+N/2,F);
    do
    {
        /*for(i=0;i<N;i++) printf("%d ",all[i]);
        printf("\n");*/
        now=0;
        for(i=0;i<N;i++) S1[i]=S[i];
        for(i=0;i<N/2;i++)
        {
            for(j=2*i;j<N;j++)
            {
                if(S1[j]==0-all[i])
                {
                    for(k=j;k>2*i;k--)
                    {
                        now++;
                        swap(S1[k],S1[k-1]);
                    }
                    break;
                }
            }
            for(j=2*i+1;j<N;j++)
            {
                if(S1[j]==all[i])
                {
                    for(k=j;k>2*i+1;k--)
                    {
                        now++;
                        swap(S1[k],S1[k-1]);
                    }
                    break;
                }
            }

        }
        ans2=min(ans2,now);

    }while(next_permutation(all,all+N/2));
    for(i=0;i<N/2;i++)
    {
        for(j=2*i;j<N;j++)
        {
            if(S[j]<0)
            {
                t=0-S[j];
                for(k=j;k>2*i;k--)
                {
                    ans1++;
                    swap(S[k],S[k-1]);
                }
                break;
            }
        }
        for(j=2*i+1;j<N;j++)
        {
            if(S[j]==t)
            {
                for(k=j;k>2*i+1;k--)
                {
                    ans1++;
                    swap(S[k],S[k-1]);
                }
                break;
            }
        }

    }
    //printf("%lld %lld\n",ans1,ans2);
    assert(ans1<=ans2);
    return ans2;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:74:13: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
             if(S[j]==t)
             ^~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15