Submission #1110704

#	Time	Username	Problem	Language	Result	Execution time	Memory
1110704		Edwardalex	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	654 ms	9408 KiB

skyscraper

#include <bits/stdc++.h>
#define fi first
#define si second
#define int long long
using namespace std;
const int N = 5e4 + 4;
int dist[N],n,m;
priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>> q;
vector<int> g[N];
pair<int,int> a[N];
signed main()
{
    cin >> n >> m;
    for(int i = 1; i <= m; i++)
    {
        cin >> a[i].fi >> a[i].si;
        a[i].fi++;
        g[a[i].fi].push_back(a[i].si);
    }
    for(int i = 1; i <= n; i++) dist[i] = 1e18;
    q.push({0,a[1].fi});
    dist[a[1].first] = 0;
    while(!q.empty())
    {
        pair<int,int> node = q.top();q.pop();
        int u = node.si, d = node.fi;
        //if(d >= 200) {continue;}
        if(dist[u] < d) continue;
        for(int p : g[u])
        {   int t = d;
            for(int i = u  + p; i <= n; i += p)
            {   t++;
                if(dist[i] > t)
                {
                    dist[i] = t;
                    q.push({dist[i],i});
                }
            }
            t = d;
            for(int i = u - p; i > 0; i -= p)
            {
                t++;
                if(dist[i] > t)
                {
                    dist[i] = t;
                    q.push({dist[i],i});
                }
            }
        }
    }
    if(dist[a[2].first] == 1e18) cout << -1;
    else cout << dist[a[2].first];
    return 0;
}

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