Submission #76995

#	Time	Username	Problem	Language	Result	Execution time	Memory
76995		vex	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	3 ms	1456 KiB

skyscraper

#include <bits/stdc++.h>
#define maxn 30005
#define INF maxn*maxn+20
#define pii pair<int,int>
#define f first
#define s second
using namespace std;

int n,m;
pii dg[maxn];

vector<pii>adj[maxn];

priority_queue<pii>pq;
int dis[maxn];
bool bio[maxn];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    cin>>n>>m;
    for(int i=0;i<m;i++)
    {
        cin>>dg[i].f>>dg[i].s;
    }
    sort(dg,dg+m);

    for(int i=0;i<m;i++)
    {
        for(int j=i+1;j<m;j++)
        {
            int dis=dg[j].f-dg[i].f;
            if(dis%dg[i].s!=0)continue;
            adj[i].push_back({j,dis/dg[i].s});
            if(dg[i].s==dg[j].s)break;
        }
        for(int j=i-1;j>=0;j--)
        {
            int dis=dg[i].f-dg[j].f;
            if(dis%dg[i].s!=0)continue;
            adj[i].push_back({j,dis/dg[i].s});
            if(dg[i].s==dg[j].s)break;
        }
    }
    /*for(int i=0;i<m;i++)
    {
        cout<<i<<"   ";
        for(auto x:adj[i])cout<<x.f<<","<<x.s<<" ";
        cout<<endl;
    }*/

    dis[0]=0;
    pq.push({0,0});
    bio[0]=false;
    for(int i=1;i<m;i++)
    {
        dis[i]=INF;
        bio[i]=false;
    }
    while(!pq.empty())
    {
        int v=pq.top().s;
        pq.pop();
        if(bio[v])continue;
        bio[v]=true;

        for(auto x:adj[v])
        {
            int u=x.f;
            int w=x.s;
            if(dis[v]+w<dis[u])
            {
                dis[u]=dis[v]+w;
                pq.push({-dis[u],u});
            }
        }
    }

    if(dis[1]==INF)cout<<"-1"<<endl;
    else cout<<dis[1]<<endl;
    return 0;
}

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