Submission #304622

#	Time	Username	Problem	Language	Result	Execution time	Memory
304622		vipghn2003	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	141 ms	6768 KiB

skyscraper

#include<bits/stdc++.h>
#define fi first
#define se second
#define pii pair<int,int>
#define mp make_pair
using namespace std;

const int N=30005;
int n,m,b[N],p[N],d[N];
vector<pii>adj[N];
vector<int>have[N];

bool Have(int pos, int val)
{
  return binary_search(have[pos].begin(), have[pos].end(), val);
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        cin>>b[i]>>p[i];
        b[i]++;
        have[b[i]].push_back(p[i]);
    }
    for(int i=1;i<=n;i++)
    {
        sort(have[i].begin(),have[i].end());
        have[i].erase(unique(have[i].begin(),have[i].end()),have[i].end());
    }
    memset(d,-1,sizeof d);
    d[b[1]]=0;
    priority_queue<pii,vector<pii>,greater<pii>>pq;
    pq.push(mp(0,b[1]));
    while(!pq.empty())
    {
        auto u=pq.top();
        pq.pop();
        if(u.fi!=d[u.se]) continue;
        for(auto&x:have[u.se])
        {
            int cnt=0,cur=u.se;
            while(cur+x<=n)
            {
                cnt++;
                cur+=x;
                if(d[cur]==-1||d[cur]>u.fi+cnt)
                {
                    d[cur]=u.fi+cnt;
                    pq.push(mp(d[cur],cur));
                }
                if(Have(cur,x)) break;
            }
            cur=u.se;
            cnt=0;
            while(cur-x>=1)
            {
                cnt++;
                cur-=x;
                if(d[cur]==-1||d[cur]>u.fi+cnt)
                {
                    d[cur]=u.fi+cnt;
                    pq.push(mp(d[cur],cur));
                }
                if(Have(cur,x)) break;
            }
        }
    }
    cout<<d[b[2]];
}

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