Submission #1117770

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117770		ntdaccode	Passport (JOI23_passport)	C++17	100 / 100	738 ms	87580 KiB

passport

#include<bits/stdc++.h>
#define fori(i,a,b) for(int i=a;i<=b;i++)
#define ll long long
#define ii pair<int,int>
#define fi first
#define se second
#define pb push_back
using namespace std;
const int mod=1e9+7;
const int M=2e5+10;
const int N=1e3+10;
int n,q;
//
int pos[M];
vector<ii> ke[4*M];
void build(int s,int l,int r)
{
  if(l==r)
  {
    pos[l]=s;
    return ;
  }
  int mid=(l+r)/2;
  build(s*2,l,mid);
  build(s*2+1,mid+1,r);
  ke[s*2].pb({s,0});
  ke[s*2+1].pb({s,0});
}
void upd(int s,int l,int r,int u,int v,int p)
{
  if(l>v||r<u) return ;
  if(u<=l&&r<=v)
  {
    ke[s].pb({p,1});
    return ;
  }
  int mid=(l+r)/2;
  upd(s*2,l,mid,u,v,p);
  upd(s*2+1,mid+1,r,u,v,p);
}
int d[4*M],f[4*M];
priority_queue<ii,vector<ii>,greater<ii> > h;
void dij()
{
  while(!h.empty())
  {
    ii u=h.top();h.pop();
    if(d[u.se]>u.fi) continue;
    for(ii v : ke[u.se])
    {
      if(d[v.fi]>u.fi+v.se)
      {
        d[v.fi]=u.fi+v.se;
        h.push({d[v.fi],v.fi});
      }
    }
  }
}
int32_t main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  #define task "1"
  if(fopen(task".inp","r"))
  {
    freopen(task".inp","r",stdin);
    freopen(task".out","w",stdout);
  }
  cin >> n;
  build(1,1,n);
  fori(i,1,n)
  {
    int l,r;
    cin >> l >> r;
    upd(1,1,n,l,r,pos[i]);
  }
  fori(i,1,4*n) d[i]=1e9;
  d[pos[1]]=0;
  h.push({0,pos[1]});
  dij();
  fori(i,1,4*n) f[i]=d[i];
  fori(i,1,4*n) d[i]=1e9;
  d[pos[n]]=0;
  h.push({0,pos[n]});
  dij();
  fori(i,1,4*n) f[i]+=d[i];
  fori(i,2,n-1) f[pos[i]]--;
  fori(i,1,4*n)
  {
    h.push({f[i],i});
    d[i]=f[i];
  }
  dij();
  cin >> q;
  while(q--)
  {
    int p;
    cin >> p;
    if(d[pos[p]]<1e8)cout << d[pos[p]]<< "\n";
    else cout << -1 << "\n";
  }
}

Compilation message (stderr)

passport.cpp: In function 'int32_t main()':
passport.cpp:67:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |     freopen(task".inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
passport.cpp:68:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |     freopen(task".out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 16 / 16
• Subtask 3: 24 / 24
• Subtask 4: 8 / 8
• Subtask 5: 46 / 46