Submission #679042

#	Time	Username	Problem	Language	Result	Execution time	Memory
679042		alexdd	Trampoline (info1cup20_trampoline)	C++17	100 / 100	1275 ms	85448 KiB

trampoline

#pragma GCC optimize("O3,unroll-loops")
#include<bits/stdc++.h>
using namespace std;
int r,c,n;
int a[200001];
int b[200001];
vector<pair<int,int>> lin[1200005];
int anc[200001][19];
map<int,int> mapl;
map<int,int> norml;
int cntn=0;
void normalizare()
{
    for(int i=1;i<=n;i++)
    {
        mapl[a[i]]++;
        mapl[a[i]-1]++;
        mapl[a[i]+1]++;
    }
    int val;
    for(auto it:mapl)
    {
        cntn++;
        norml[it.first]=cntn;
    }
    for(int i=1;i<=n;i++)
        a[i]=norml[a[i]];
}
bool query(int lins, int cols, int linf, int colf)
{
    ///returneaza colf
    if(lins>linf)
        return 0;
    if(cols>colf)
        return 0;
    if(lins==linf)
        return 1;

    if(lin[lins].size()==0 || lin[lins][lin[lins].size()-1].first < cols)
        return 0;
    int st,dr,mij;
    st=0;
    dr=lin[lins].size()-1;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(lin[lins][mij].first>=cols && (mij==0 || lin[lins][mij-1].first<cols))
            break;
        else if(lin[lins][mij].first>=cols)
            dr=mij-1;
        else
            st=mij+1;
    }
    int cur = lin[lins][mij].second;
    for(int i=0;i<19;i++)
    {
        if(((1<<i)&(linf-lins-1))!=0)
            cur = anc[cur][i];
        if(cur==-1)
            break;
    }
    if(cur==-1)
        return 0;
    if(b[cur] <= colf)
        return 1;
    else
        return 0;
}
int cit[200001][4];
signed main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);

    cin>>r>>c>>n;
    for(int i=1;i<=n;i++)
        cin>>a[i]>>b[i];
    int q;
    cin>>q;
    for(int i=0;i<q;i++)
    {
        cin>>cit[i][0]>>cit[i][1]>>cit[i][2]>>cit[i][3];
        mapl[cit[i][0]]++;
        mapl[cit[i][0]-1]++;
        mapl[cit[i][0]+1]++;
        mapl[cit[i][2]]++;
        mapl[cit[i][2]-1]++;
        mapl[cit[i][2]+1]++;
    }
    normalizare();
    for(int i=1;i<=n;i++)
    {
        lin[a[i]].push_back({b[i],i});
    }
    for(int i=1;i<=cntn;i++)
        sort(lin[i].begin(),lin[i].end());
    for(int i=1;i<=cntn;i++)
    {
        for(auto x:lin[i])
        {
            ///calc anc[x.second][0]
            if(lin[i+1].size()==0 || lin[i+1][lin[i+1].size()-1].first<x.first)
            {
                anc[x.second][0]=-1;
            }
            else
            {
                int st,dr,mij;
                st=0;
                dr=lin[i+1].size()-1;
                while(st<=dr)
                {
                    mij=(st+dr)/2;
                    if(lin[i+1][mij].first>=x.first && (mij==0 || lin[i+1][mij-1].first<x.first))
                        break;
                    else if(lin[i+1][mij].first>=x.first)
                        dr=mij-1;
                    else
                        st=mij+1;
                }
                anc[x.second][0] = lin[i+1][mij].second;
            }
        }
    }
    for(int put=1;put<19;put++)
    {
        for(int i=1;i<=cntn;i++)
        {
            for(auto x:lin[i])
            {
                ///calc anc[x.second][put]
                if(anc[x.second][put-1]==-1)
                    anc[x.second][put]=-1;
                else
                    anc[x.second][put]=anc[anc[x.second][put-1]][put-1];
            }
        }
    }
    int lins,cols,linf,colf;
    for(int i=0;i<q;i++)
    {
        lins = norml[cit[i][0]];
        cols = cit[i][1];
        linf = norml[cit[i][2]];
        colf = cit[i][3];
        if(query(lins,cols,linf,colf))
            cout<<"Yes";
        else
            cout<<"No";
        cout<<"\n";
    }
    return 0;
}

Compilation message (stderr)

trampoline.cpp: In function 'void normalizare()':
trampoline.cpp:20:9: warning: unused variable 'val' [-Wunused-variable]
   20 |     int val;
      |         ^~~
trampoline.cpp: In function 'bool query(int, int, int, int)':
trampoline.cpp:54:28: warning: 'mij' may be used uninitialized in this function [-Wmaybe-uninitialized]
   54 |     int cur = lin[lins][mij].second;
      |                            ^
trampoline.cpp: In function 'int main()':
trampoline.cpp:120:48: warning: 'mij' may be used uninitialized in this function [-Wmaybe-uninitialized]
  120 |                 anc[x.second][0] = lin[i+1][mij].second;
      |                                                ^

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 11 / 11
• Subtask 4: 19 / 19
• Subtask 5: 27 / 27