Submission #143854

#	Time	Username	Problem	Language	Result	Execution time	Memory
143854		daniel920712	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	939 ms	3704 KiB

shoes

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

using namespace std;
int S1[2005];
int S2[2005];
int all[2005];
int a[2005]={0};
int b[2005]={0};
bool F(int a,int b)
{
    return a<b;
}
long long count_swaps(std::vector<int> S)
{
    long long ans1=0,small,what,t;
    int i,j,k,N=S.size();
    for(i=0;i<N/2;i++)
    {
        for(j=1;j<=N/2;j++)
        {
            a[j]=100000000;
            b[j]=100000000;
        }
        for(j=2*i;j<N;j++)
        {
            if(S[j]<0) b[0-S[j]]=min(b[0-S[j]],j);
            else a[S[j]]=min(a[S[j]],j);
        }
        small=1000000000;
        for(j=1;j<=N/2;j++)
        {
            t=a[j]+b[j];
            if(a[j]>b[j]) t++;
            if(t<small)
            {
                small=t;
                what=j;
            }
        }
        for(j=2*i;j<N;j++)
        {
            if(S[j]==0-what)
            {
                for(k=j;k>2*i;k--)
                {
                    swap(S[k],S[k-1]);
                    ans1++;
                }
                break;
            }
        }
        for(j=2*i+1;j<N;j++)
        {
            if(S[j]==what)
            {
                for(k=j;k>2*i+1;k--)
                {
                    swap(S[k],S[k-1]);
                    ans1++;
                }
                break;
            }
        }
    }


    return ans1;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:46:23: warning: 'what' may be used uninitialized in this function [-Wmaybe-uninitialized]
             if(S[j]==0-what)
                      ~^~~~~

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