Submission #919612

#	Time	Username	Problem	Language	Result	Execution time	Memory
919612		andrei_iorgulescu	Trampoline (info1cup20_trampoline)	C++14	100 / 100	1137 ms	62136 KiB

trampoline

#include <bits/stdc++.h>

using namespace std;

int r,c,n,q;
int x[200005],y[200005];
map<int,vector<pair<int,int>>>v;
int jump[20][200005];
set<int>st;
int lg[200005];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> r >> c >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> x[i] >> y[i];
        v[x[i]].push_back({y[i],i});
        st.insert(x[i]);
    }
    for (auto it : st)
        sort(v[it].begin(),v[it].end());
    for (int i = 1; i <= n; i++)
    {
        int xx = x[i] + 1,yy = y[i];
        int st = -1,pas = 1 << 17;
        while (pas != 0)
        {
            if (st + pas < v[xx].size() and v[xx][st + pas].first < yy)
                st += pas;
            pas /= 2;
        }
        st++;
        if (st == v[xx].size())
            jump[0][i] = -1;
        else
            jump[0][i] = v[xx][st].second;
    }
    for (int i = 2; i <= n; i++)
        lg[i] = 1 + lg[i / 2];
    for (int b = 1; b <= lg[n]; b++)
    {
        for (int i = 1; i <= n; i++)
        {
            if (jump[b - 1][i] == -1)
                jump[b][i] = -1;
            else
                jump[b][i] = jump[b - 1][jump[b - 1][i]];
        }
    }
    cin >> q;
    for (int i = 1; i <= q; i++)
    {
        int xs,ys,xf,yf;
        cin >> xs >> ys >> xf >> yf;
        if (xs > xf or ys > yf)
            cout << "No\n";
        else if (xs == xf)
            cout << "Yes\n";
        else
        {
            int xx = xs,yy = ys;
            int st = -1,pas = 1 << 17;
            //cout << yy << ' ' << v[xx][0].first << '\n';
            while (pas != 0)
            {
                if (st + pas < v[xx].size() and v[xx][st + pas].first < yy)
                    st += pas;
                pas /= 2;
            }
            st++;
            //cout << st << ' ';
            if (st == v[xx].size())
                cout << "No\n";
            else
            {
                int tr = v[xx][st].second;
                if (y[tr] > yf)
                    cout << "No\n";
                else
                {
                    //cout << tr << ' ';
                    for (int b = lg[n]; b >= 0; b--)
                    {
                        //cout << jump[b][tr] << ' ';
                        if (jump[b][tr] != -1 and y[jump[b][tr]] <= yf)
                            tr = jump[b][tr];
                    }
                    if (x[tr] + 1 >= xf)
                        cout << "Yes\n";
                    else
                        cout << "No\n";
                }
            }
        }
    }
    return 0;
}

/**
next[i] = care e urmatoarea verde in care as merge din trambulina i
fac binary lifting pe treaba asta
vad in ce trambulina verde urc si daca pe jumpurile aleia ajung la linia xf inainte de yf
**/

Compilation message (stderr)

trampoline.cpp: In function 'int main()':
trampoline.cpp:32:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |             if (st + pas < v[xx].size() and v[xx][st + pas].first < yy)
      |                 ~~~~~~~~~^~~~~~~~~~~~~~
trampoline.cpp:37:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         if (st == v[xx].size())
      |             ~~~^~~~~~~~~~~~~~~
trampoline.cpp:70:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |                 if (st + pas < v[xx].size() and v[xx][st + pas].first < yy)
      |                     ~~~~~~~~~^~~~~~~~~~~~~~
trampoline.cpp:76:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |             if (st == v[xx].size())
      |                 ~~~^~~~~~~~~~~~~~~

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