Submission #553464

#	Time	Username	Problem	Language	Result	Execution time	Memory
553464		ala2	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	285 ms	262144 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[10100];
        int dist(int i,int j)
        {
            return abs(a[j]-a[i]);
        }
        int dis[30010];
        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=a[i];
     
     
            }
            for(int i=1;i<=m;i++)
            {
                int g=0;
                for(int j=a[i]-b[i];j>=0;j-=b[i])
                {
                    g++;
                    //cout<<"    "<<a[i]<<"   "<<j<<"  "<<g<<endl;
                    v[a[i]].pb({g,j});
                }
                g=1;
                for(int j=a[i]+b[i];j<n;j+=b[i])
                {
                  //  cout<<"            "<<a[i]<<"  "<<j<<"   "<<g<<endl;
                    v[a[i]].pb({g,j});
                    g++;
                }
            }
     
            if(ss==ee)
            {
                cout<<0<<endl;
                return 0;
            }
            for(int i=0;i<=n;i++)
                sort(v[i].B,v[i].E);
            for(int i=0;i<=n+1;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])
                    {
                        //cout<<"              "<<i.S<<"   "<<ned<<"    "<<
                        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:66:20: warning: 'ss' may be used uninitialized in this function [-Wmaybe-uninitialized]
   66 |             dis[ss]=0;
      |             ~~~~~~~^~
skyscraper.cpp:89:22: warning: 'ee' may be used uninitialized in this function [-Wmaybe-uninitialized]
   89 |             if(dis[ee]<inf)
      |                ~~~~~~^

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