Submission #242942

#	Time	Username	Problem	Language	Result	Execution time	Memory
242942		kai824	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	362 ms	262148 KiB

skyscraper

#include"bits/stdc++.h"
using namespace std;

#define int long long
#define mp make_pair
#define pii pair<int,int>

vector<pair<pii,int> > adjl[30005][180];//position, power, weight... if power==179, then it's dummy
bool used[30005][180];
int dist[30005][180],a,b,c;

priority_queue<pair<int,pii>,vector<pair<int,pii> >, greater<pair<int,pii> > > dijk;
//weight, pos, power

int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(0);
    int n,m,s,d,start,end;
    cin>>n>>m;//m doges, n buildings
    for(int x=0;x<n;x++){
      for(int y=0;y<179;y++){
        adjl[x][y].emplace_back(mp(x,179),0);
        dist[x][y]=LLONG_MAX;
        /*if(y>0){
          if(x+y<n)adjl[x][y].emplace_back(mp(x+y,y),1);
          if(x-y>=0)adjl[x][y].emplace_back(mp(x-y,y),1);
        }*/
      }
      dist[x][179]=LLONG_MAX;
    }
    for(int x=0;x<m;x++){
      cin>>s>>d;//position s, power d
      if(x==0)start=s;
      else if(x==1)end=s;
      if((d*d)>=n){
        for(int i=1;i<=n;i++){
          if(s-(d*i)>=0){
            adjl[s][179].emplace_back(mp(s-(d*i),179),i);
          }else if(s+(d*i)>=n)break;
          if(s+(d*i)<n){
            adjl[s][179].emplace_back(mp(s+(d*i),179),i);
          }
        }
      }else{
        adjl[s][179].emplace_back(mp(s,d),0);
        if(used[s][d]==false){
          used[s][d]=true;
          for(int i=1;i<=n;i++){
            if(s-(d*i)>=0){
              adjl[s-(d*i)][d].emplace_back(mp(s-(d*i)+d,d),1);
              adjl[s-(d*i)+d][d].emplace_back(mp(s-(d*i),d),1);
              used[s-(d*i)][d]=true;
            }else if(s+(d*i)>=n)break;
            if(s+(d*i)<n){
              adjl[s+(d*i)][d].emplace_back(mp(s+(d*i)-d,d),1);
              adjl[s+(d*i)-d][d].emplace_back(mp(s+(d*i),d),1);
              used[s+(d*i)][d]=true;
            }
          }
        }
      }
    }

    dijk.emplace(0,mp(start,179));//pos, power...
    dist[start][179]=0;
    while(!dijk.empty()){
      c=dijk.top().first;
      a=dijk.top().second.first;
      b=dijk.top().second.second;
      if(a==end){
        cout<<c;
        return 0;
      }
      dijk.pop();

      for(int i=0;i<adjl[a][b].size();i++){
        if(dist[adjl[a][b][i].first.first][adjl[a][b][i].first.second]>c+adjl[a][b][i].second){
          dist[adjl[a][b][i].first.first][adjl[a][b][i].first.second]=c+adjl[a][b][i].second;
          dijk.emplace(c+adjl[a][b][i].second,adjl[a][b][i].first );
        }
      }
    }
    if(dist[end][179]==LLONG_MAX)cout<<"-1";
    else cout<<dist[end][179];
    return 0;
}
/*
*/

Compilation message (stderr)

skyscraper.cpp: In function 'int32_t main()':
skyscraper.cpp:75:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int i=0;i<adjl[a][b].size();i++){
                   ~^~~~~~~~~~~~~~~~~~
skyscraper.cpp:64:21: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized]
     dist[start][179]=0;
     ~~~~~~~~~~~~~~~~^~
skyscraper.cpp:82:21: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(dist[end][179]==LLONG_MAX)cout<<"-1";
        ~~~~~~~~~~~~~^

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