Submission #725074

#	Time	Username	Problem	Language	Result	Execution time	Memory
725074		tigar	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	2 ms	2036 KiB

skyscraper

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
ll m, n;
ll b[30030], p[30030];
vector<ll>srapers[30030];
vector<pair<ll, ll> >graff[30030];
ll dist[30030];
bool check1[30030];
ll INF=LONG_LONG_MAX;

/*void dijkstra(ll cvor)
{
    for(int i=0; i<30030; i++){check1[i]=false; dist[i]=INF;}
    priority_queue<pair<ll, ll> >ord;
    dist[cvor]=0;
    ord.push({0, cvor});
    while(!ord.empty())
    {
        int cv=ord.top().second;
        ord.pop();
        if(check1[cv])continue;
        check1[cv]=true;
        for(int j=0; j<graff[cv].size(); j++)
        {
            ll pp=graff[cv][j].first;
            dist[pp]=min(dist[pp], dist[cv]+graff[cv][j].second);
            if(!check1[pp])ord.push({-dist[pp], pp});
        }
    }
}*/

void dijkstra(int s, vector<int> & p) {
    p.assign(n, -1);
    vector<bool> u(n, false);
    for(int i=0; i<n; i++)dist[i]=INF;
    dist[s] = 0;
    for (int i = 0; i < n; i++) {
        int v = -1;
        for (int j = 0; j < n; j++) {
            if (!u[j] && (v == -1 || dist[j] < dist[v]))
                v = j;
        }

        if (dist[v] == INF)
            break;

        u[v] = true;
        for (auto edge : graff[v]) {
            int to = edge.first;
            int len = edge.second;

            if (dist[v] + len < dist[to]) {
                dist[to] = dist[v] + len;
                p[to] = v;
            }
        }
    }
}

int main()
{

    cin>>n>>m;
    for(int i=0; i<m; i++)
    {
        cin>>b[i]>>p[i];
        srapers[b[i]].push_back(i);
    }
    for(int i=0; i<m; i++)
    {
        ll br=0;
        while(b[i]-br*p[i]>=0 or b[i]+br*p[i]<n)
        {
            int j;
            if(b[i]-br*p[i]>=0)
            {
                j=b[i]-br*p[i];
                for(int l=0; l<srapers[j].size(); l++)
                {
                    graff[i].push_back({srapers[j][l], br});
                }
            }
            if(b[i]+br*p[i]<n)
            {
                j=b[i]+br*p[i];
                for(int l=0; l<srapers[j].size(); l++)
                {
                    graff[i].push_back({srapers[j][l], br});
                }
            }
            br++;
        }
    }
    vector<int>p(30030);
    dijkstra(0, p);
    if(dist[1]==INF){cout<<-1; return 0;}
    cout<<dist[1];
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:80:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |                 for(int l=0; l<srapers[j].size(); l++)
      |                              ~^~~~~~~~~~~~~~~~~~
skyscraper.cpp:88:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |                 for(int l=0; l<srapers[j].size(); l++)
      |                              ~^~~~~~~~~~~~~~~~~~

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