Submission #695142

#	Time	Username	Problem	Language	Result	Execution time	Memory
695142		Abito	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1094 ms	71192 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define F first
#define S second
#define int long long
const int N=3e4+5;
int a[N],b[N],n,m,dis[N];
vector<pair<int,int>> adj[N];
vector<int> d[N],p[N];
bool vis[N];
priority_queue<pair<int,int>> pq;
void getdiv(int x){
    for (int i=1;i*i<=x;i++){
        if (x%i) continue;
        int y=i,z=x/i;
        d[x].pb(y);
        if (y!=z) d[x].pb(z);
    }sort(d[x].begin(),d[x].end());
    return;
}
void dijkstra(){
    pq.push({0,a[0]});
    while (!pq.empty()){
        pair<int,int> x=pq.top();
        x.F*=-1;pq.pop();
        if (vis[x.S]) continue;
        vis[x.S]=true;
        for (auto u:adj[x.S]){
            if (dis[u.F]<=x.F+u.S) continue;
            dis[u.F]=x.F+u.S;
            pq.push({-dis[u.F],u.F});
        }
    }return;
}
int32_t main(){
    for (int i=0;i<N;i++){
        getdiv(i);
        dis[i]=INT_MAX;
    }cin>>n>>m;
    for (int i=0;i<m;i++){
        cin>>a[i]>>b[i];
        p[a[i]].pb(b[i]);
    }dis[a[0]]=0;
    for (int i=0;i<n;i++) sort(p[i].begin(),p[i].end());
    for (int i=0;i<n;i++){
        for (int j=0;j<n;j++){
            if (i==j) continue;
            int dist=abs(i-j),x=0,y=0,ans=INT_MAX;
            while (x<d[dist].size() && y<p[i].size()){
                if (d[dist][x]==p[i][y]){
                    ans=dist/d[dist][x];
                    x++;
                    y++;
                    continue;
                }
                if (d[dist][x]<p[i][y]) x++;
                else y++;
            }
            if (ans==INT_MAX) continue;
            adj[i].pb({j,ans});
        }
    }dijkstra();
    if (dis[a[1]]==INT_MAX) cout<<-1<<endl;
    else cout<<dis[a[1]]<<endl;
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int32_t main()':
skyscraper.cpp:50:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |             while (x<d[dist].size() && y<p[i].size()){
      |                    ~^~~~~~~~~~~~~~~
skyscraper.cpp:50:41: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |             while (x<d[dist].size() && y<p[i].size()){
      |                                        ~^~~~~~~~~~~~

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