Submission #1022411

#	Time	Username	Problem	Language	Result	Execution time	Memory
1022411		vjudge1	Martian DNA (BOI18_dna)	C++17	0 / 100	2051 ms	2644 KiB

dna

#include<iostream>
#include<fstream>
#include<cmath>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
    int n,r,k;
    cin>>n>>k>>r;
    vector<int> dna(n);
    for(int i=0;i<n;i++) cin>>dna[i];
    int mini=200000,maxi=-1;
    int br=0;
    br=0;
    int b,q;
    cin>>b>>q;
    int id1,id2,id;
    while(br<q)
    {
        vector<int>::iterator it=find(dna.begin(),dna.end(),b);
        if(it==dna.end()) break;
        id=distance(dna.begin(),it);
        if(br==0) id1=id;
        dna[id]=-1;
        br++;
    }
    if(br<q)
    {
        cout<<"impossible"<<endl;
        return 0;
    }
    id2=id;
    mini=min(mini,id1);
    maxi=max(maxi,id2);
    for(int i=1;i<r;i++)
    {
        cin>>b>>q;
        br=0;
        id1=mini;
        id2=maxi;
        while(br<q)
        {
            vector<int>::iterator it=find(dna.begin()+id1,dna.begin()+id2+1,b);
            int j=1;
            int count=0;
            if(it==dna.begin()+id2+1)
            {
                while(count==0&&(id1-j>=0||id2+j<n))
                {
                id1=id1-j;
                vector<int>::iterator it1=find(dna.begin()+id1,dna.begin()+id2+1,b);
                if(it1==dna.begin()+id2+1)
                {
                    id2+=j;
                    id1+=j;
                    vector<int>::iterator it2=find(dna.begin()+id1,dna.begin()+id2+1,b);
                    if(it2==dna.begin()+id2+1)
                    {
                        id2-=j;
                        j++;
                    }
                    else
                    {
                        int id=distance(dna.begin(),it2);
                        dna[id]=-1;
                        br++;
                        break;
                    }
                }
                else
                    {
                        int id=distance(dna.begin(),it1);
                        dna[id]=-1;
                        br++;
                        break;
                    }
            }
            
            }
            else
                    {
                        int id=distance(dna.begin(),it);
                        dna[id]=-1;
                        br++;
                        continue;
                    }
        }
        
        if(br<q)
        {
            cout<<"impossible"<<endl;
            return 0;
        }
        mini=min(mini,id1);
        maxi=max(maxi,id2);
    }



    cout<<maxi-mini+1<<endl;
    return 0;
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:19:9: warning: 'id1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   19 |     int id1,id2,id;
      |         ^~~
dna.cpp:19:17: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
   19 |     int id1,id2,id;
      |                 ^~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 24
• Subtask 3: 0 / 28
• Subtask 4: 0 / 32