Submission #845235

#	Time	Username	Problem	Language	Result	Execution time	Memory
845235		samekkk	Trampoline (info1cup20_trampoline)	C++14	73 / 100	2062 ms	24744 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;
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 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())
        {
            nextt[i] = -1;
            continue;
        }
        auto it = S[y+1].lower_bound({x,-1});
        if (it != S[y+1].end()) nextt[i] = it->idx;
        else nextt[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;
        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:40:18: warning: unused variable 'it' [-Wunused-variable]
   40 |         if (auto it = S.find(y+1) == S.end())
      |                  ^~
trampoline.cpp:63:18: warning: unused variable 'it' [-Wunused-variable]
   63 |         if (auto it = S.find(y_1) == S.end())
      |                  ^~
trampoline.cpp:68:18: warning: unused variable 'it' [-Wunused-variable]
   68 |         if (auto it = S[y_1].lower_bound({x_1,-1}) == S[y_1].end())
      |                  ^~

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 11 / 11
• Subtask 4: 19 / 19
• Subtask 5: 0 / 27