Submission #729024

#	Time	Username	Problem	Language	Result	Execution time	Memory
729024		MilosMilutinovic	Passport (JOI23_passport)	C++14	100 / 100	1413 ms	90756 KiB

passport

#include <bits/stdc++.h>
using namespace std;
 
const int inf=0x3f3f3f3f;
int n,q,l[800005],r[800005],dl[800005],dr[800005],dis[800005],idx[200005];
vector<int> g[800005];
 
void bfs(int* d)
{
    set<pair<int,int>> st;
    for(int i=1;i<=n;i++) st.emplace(d[i],i);
    while(!st.empty())
    {
        auto it=st.begin();
        int x=it->second;
        st.erase(it);
        if(x<=n)
        {
            for(int y=idx[x];y>=1;y/=2)
            {
                if(d[n+y]>d[x])
                {
                    if(st.find({d[n+y],n+y})!=st.end()) st.erase(st.find({d[n+y],n+y}));
                    d[n+y]=d[x];st.emplace(d[n+y],n+y);
                }
            }
        }
        else
        {
            for(int y:g[x])
            {
                int f=d[x]+(y<=n);
                if(d[y]>f)
                {
                    if(st.find({d[y],y})!=st.end()) st.erase(st.find({d[y],y}));
                    d[y]=f;st.emplace(f,y);
                }
            }
        }
    }
}
 
void build(int v,int l,int r)
{
    if(l==r) {idx[l]=v;return;}
    int mid=l+r>>1;
    build(v*2,l,mid);
    build(v*2+1,mid+1,r);
}
void add(int v,int l,int r,int ql,int qr,int i)
{
    if(l>r||l>qr||r<ql) return;
    if(ql<=l&&r<=qr)
    {
        g[i].push_back(n+v);
        g[n+v].push_back(i);
        return;
    }
    int mid=l+r>>1;
    add(v*2,l,mid,ql,qr,i);
    add(v*2+1,mid+1,r,ql,qr,i);
}
 
signed main()
{
    scanf("%d",&n);
    for(int i=1;i<=n;i++) scanf("%d%d",&l[i],&r[i]);
    build(1,1,n);
    for(int i=1;i<=n;i++) add(1,1,n,l[i],r[i],i);
    for(int i=1;i<=800000;i++) dl[i]=dr[i]=dis[i]=inf;
    dl[1]=0;dr[n]=0;
    bfs(dl);bfs(dr);
    dl[1]=1;dr[n]=1;
    for(int i=1;i<=n;i++) dis[i]=dl[i]+dr[i];
    bfs(dis);
    for(int i=1;i<=n;i++) if(dis[i]>=inf) dis[i]=-1; else dis[i]--;
    scanf("%d",&q);
    while(q--)
    {
        int x;scanf("%d",&x);
        printf("%d\n",dis[x]);
    }
}

Compilation message (stderr)

passport.cpp: In function 'void build(int, int, int)':
passport.cpp:46:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |     int mid=l+r>>1;
      |             ~^~
passport.cpp: In function 'void add(int, int, int, int, int, int)':
passport.cpp:59:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   59 |     int mid=l+r>>1;
      |             ~^~
passport.cpp: In function 'int main()':
passport.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
passport.cpp:67:32: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |     for(int i=1;i<=n;i++) scanf("%d%d",&l[i],&r[i]);
      |                           ~~~~~^~~~~~~~~~~~~~~~~~~~
passport.cpp:77:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |     scanf("%d",&q);
      |     ~~~~~^~~~~~~~~
passport.cpp:80:20: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         int x;scanf("%d",&x);
      |               ~~~~~^~~~~~~~~

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