Submission #845262

#	Time	Username	Problem	Language	Result	Execution time	Memory
845262		samekkk	Trampoline (info1cup20_trampoline)	C++14	100 / 100	873 ms	54544 KiB

trampoline

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(a,b) for (int a = 0; a < (b); ++a)
#define pb push_back
#define all(t) t.begin(), t.end()

struct Pole
{
    int y=-1, x=-1;
};

struct Element
{
    int val, idx;
    bool operator < (const Element &element) const
    {
        return val < element.val;
    }
};

const int max_N = 2e5+5, lg_SIZE = 18;
int wysokosc = 0, szerokosc = 0, n = 0, q = 0, y_1 = 0, y_2 = 0, x_1 = 0, x_2 = 0;
Pole P[max_N];
int nextt[max_N];
map<int,set<Element>> S;
int jump[max_N][lg_SIZE+1];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> wysokosc >> szerokosc >> n;
    rep(i,n) cin >> P[i].y >> P[i].x;
    rep(i,n) S[P[i].y].insert({P[i].x,i});
    rep(i,n)
    {
        int y = P[i].y, x = P[i].x;
        if (auto it = S.find(y+1) == S.end())
        {
            jump[i][0] = i;
            continue;
        }
        auto it = S[y+1].lower_bound({x,-1});
        if (it != S[y+1].end()) jump[i][0] = it->idx;
        else jump[i][0] = i;
    }
    for (int i = 1; i <= lg_SIZE; ++i)
    {
        rep(j,n)
        {
            int val = jump[j][i-1];
            jump[j][i] = jump[val][i-1];
        }
    }
    cin >> q;
    rep(z,q)
    {
        cin >> y_1 >> x_1 >> y_2 >> x_2;
        if (y_1 > y_2 or x_1 > x_2)
        {
            cout << "No" << '\n';
            continue;
        }
        if (y_1 == y_2)
        {
            cout << "Yes" << '\n';
            continue;
        }
        if (auto it = S.find(y_1) == S.end())
        {
            cout << "No" << '\n';
            continue;
        }
        if (auto it = S[y_1].lower_bound({x_1,-1}) == S[y_1].end())
        {
            cout << "No" << '\n';
            continue;
        }
        int akt = (S[y_1].lower_bound({x_1,-1}))->idx, y = P[akt].y, x = P[akt].x;
        bool czy_OK = false;
        for (int i = lg_SIZE; i >= 0; --i)
        {
            int v = jump[akt][i];
            if(P[v].y <= y_2-1) akt = v;
        }
        if((P[akt].y == y_2 or P[akt].y == y_2-1) and P[akt].x <= x_2) cout << "Yes" << '\n';
        else cout << "No" << '\n';
        /*
        while(y < y_2)
        {
            ++y;
            if (y > wysokosc) break;
            if (y == y_2 and x <= x_2)
            {
                czy_OK = true;
                break;
            }
            if (nextt[akt] == -1) break;
            akt = nextt[akt], x = P[akt].x;
        }
        if (czy_OK == true) cout << "Yes" << '\n';
        else cout << "No" << '\n';
        */
    }
    return 0;
}

Compilation message (stderr)

trampoline.cpp: In function 'int main()':
trampoline.cpp:41:18: warning: unused variable 'it' [-Wunused-variable]
   41 |         if (auto it = S.find(y+1) == S.end())
      |                  ^~
trampoline.cpp:72:18: warning: unused variable 'it' [-Wunused-variable]
   72 |         if (auto it = S.find(y_1) == S.end())
      |                  ^~
trampoline.cpp:77:18: warning: unused variable 'it' [-Wunused-variable]
   77 |         if (auto it = S[y_1].lower_bound({x_1,-1}) == S[y_1].end())
      |                  ^~
trampoline.cpp:82:56: warning: unused variable 'y' [-Wunused-variable]
   82 |         int akt = (S[y_1].lower_bound({x_1,-1}))->idx, y = P[akt].y, x = P[akt].x;
      |                                                        ^
trampoline.cpp:82:70: warning: unused variable 'x' [-Wunused-variable]
   82 |         int akt = (S[y_1].lower_bound({x_1,-1}))->idx, y = P[akt].y, x = P[akt].x;
      |                                                                      ^
trampoline.cpp:83:14: warning: unused variable 'czy_OK' [-Wunused-variable]
   83 |         bool czy_OK = false;
      |              ^~~~~~

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