Submission #695265

#	Time	Username	Problem	Language	Result	Execution time	Memory
695265		Mr_Ph	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	1 ms	212 KiB

skyscraper

///Never gonna give you up.
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
typedef long long ll;
typedef long long int lli;
typedef unsigned long long ull;
using namespace std;
using namespace __gnu_pbds;
template<class x>
using ordered_set = tree<x, null_type,less<x>, rb_tree_tag,tree_order_statistics_node_update>;
const ll mod=(ll)1e9+7;
const ll mod1=998244353;
///the defines :)
#define endl '\n'
#define vi vector<int>
#define vll vector<ll>
#define ent(arr) for(int i=0;i<arr.size();i++)cin>>arr[i];
#define all(arr) arr.begin(),arr.end()
#define allr(arr) arr.rbegin(),arr.rend()
#define sz size()
#define int long long
///the end of the defines ;)
void bla()
{
  
#ifndef ONLINE_JUDGE
    freopen("input.txt","r",stdin);
    freopen("notsus.txt","w",stdout);
#endif
}
int n,m;
vector<vector<pair<int,int>>>adj;
void preprocess(){}
void solve()
{
  cin>>n>>m;
  adj.resize(n+1);
  map<int,int>mp;
  for(int i=0;i<m;i++)
  {
    int a,b;
    cin>>a>>b;
    int cnt=0;
    mp[i]=a;
    for(int i=a-b;i>=0;i-=b)
    {
      cnt++;
      adj[a].push_back({i,cnt});
    }
    cnt=0;
    for(int i=a+b;i<n;i+=b)
    {
      cnt++;
      adj[a].push_back({i,cnt});
    }
  }
  priority_queue<pair<int,int>>q;
  q.push({mp[0],0});
  vector<int>dis;
  for(int i=0;i<=n+3;i++)dis.push_back(1e9);
    dis[mp[0]]=0;
  bool vs[n+5]={false};
  vs[mp[0]]=true;
  while(q.sz)
  {
     int node=q.top().second,cost=q.top().first;
    q.pop();
    vs[node]=false;
    for(auto i:adj[node])
    {
      if(dis[node]+i.second<dis[i.first])
      {
        dis[i.first]=dis[node]+i.second;
        if(!vs[i.first]) q.push({-dis[i.first], i.first});
        vs[i.first] = true;
      }
    }
  }
  if(dis[mp[1]]==1e9)cout<<-1<<endl;
  else
  cout<<dis[mp[1]]<<endl;
}
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    preprocess();
    //bla();
    int t=1;
   //cin>>t;
    while(t--)
        solve();
}

Compilation message (stderr)

skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:67:30: warning: unused variable 'cost' [-Wunused-variable]
   67 |      int node=q.top().second,cost=q.top().first;
      |                              ^~~~
skyscraper.cpp: In function 'void bla()':
skyscraper.cpp:28:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     freopen("input.txt","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:29:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     freopen("notsus.txt","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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