Submission #553454

#	Time	Username	Problem	Language	Result	Execution time	Memory
553454		ala2	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	2 ms	2644 KiB

skyscraper

    #include <bits/stdc++.h>
    #define int long long
    #define F first
    #define S second
    #define pb push_back
    #define B begin()
    #define E end()

    using namespace std;
    int a[30010];
    int b[30010];
    vector<pair<int,int>>v[100100];
    int dist(int i,int j)
    {
        return abs(a[j]-a[i]);
    }
    int dis[100100];
    const int inf=1e17;
    signed main()
    {
       ios_base::sync_with_stdio();
       cin.tie(0);
       cout.tie(0);
        int n,m;
        cin>>n>>m;
        int ss,ee;
        for(int i=1;i<=m;i++)
        {
            cin>>a[i]>>b[i];
            if(i==1)
                ss=a[i];
            if(i==2)
                ee=b[i];
        }
        for(int i=1;i<=m;i++)
        {
            for(int j=1;j<=m;j++)
            {
                if(j==i)
                    continue;
                if( dist(i,j)%b[i]==0 ){
            //            cout<<"     "<<i<<"   "<<j<<endl;
                    v[a[i]].pb({dist(i,j)/b[i],a[j]});
                }
            }
        }
        for(int i=0;i<=n;i++)
            sort(v[i].B,v[i].E);
        for(int i=0;i<=n;i++)
        {
            dis[i]=inf;
        }
        dis[ss]=0;
        priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>>q;
        q.push({0,ss});
        while(!q.empty())
        {
          //  cout<<"D";
            pair<int,int>x=q.top();
            q.pop();
           // cout<<"      ::::   "<<x.S<<endl;
            for(auto i:v[x.S])
            {
                int ned=x.F+i.F;            //    cout<<"         "<<i.F<<"   "<<ned<<endl;

                if(ned<dis[i.S])
                {
                    dis[i.S]=ned;
                    q.push({ned,i.S});
                }
            }


        }
        if(dis[ee]<inf)
        cout<<dis[ee]<<endl;
        else cout<<-1<<endl;

    }

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:75:18: warning: 'ee' may be used uninitialized in this function [-Wmaybe-uninitialized]
   75 |         if(dis[ee]<inf)
      |            ~~~~~~^

• Subtask 1: 0 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43