Submission #553465

#	Time	Username	Problem	Language	Result	Execution time	Memory
553465		ala2	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	81 ms	73556 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[300010];
int b[300010];
//vector<pair<int,int>>v[100100];
int dist(int i,int j)
{
    return abs(a[j]-a[i]);
}
int gg[2002][2002];
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;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            gg[i][j] = inf;
        }
    }
    int ss=0,ee=0;
    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;
            gg[a[i]][j]=min(gg[a[i]][j],g);
        }
        g=1;
        for(int j=a[i]+b[i]; j<n; j+=b[i])
        {
            //  cout<<"            "<<a[i]<<"  "<<j<<"   "<<g<<endl;
            gg[a[i]][j]=min(gg[a[i]][j],g);
            g++;
        }
    }

    if(ss==ee)
    {
        cout<<0<<endl;
        return 0;
    }
    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(int i=0;i<n;i++)
        {
            if(i==x.S)
                continue;

            int ned=x.F+gg[x.S][i];            //    cout<<"         "<<i.F<<"   "<<ned<<endl;

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


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

}

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