Submission #364291

#	Time	Username	Problem	Language	Result	Execution time	Memory
364291		Alexandruabcde	Trampoline (info1cup20_trampoline)	C++11	11 / 100	382 ms	31212 KiB

trampoline

#include <bits/stdc++.h>

using namespace std;

constexpr int NMAX = 2e5 + 5;

struct trampoline {
    int x, y;
};

trampoline a[NMAX];

int R, C, N;

int dad[30][NMAX];

bool viz[NMAX];
vector <int> G[NMAX];

int T;

void Read () {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> R >> C >> N;

    for (int i = 1; i <= N; ++ i )
        cin >> a[i].x >> a[i].y;
}

bool cmp (trampoline a, trampoline b) {
    if (a.x < b.x) return false;

    if (a.x == b.x && a.y < b.y) return false;

    return true;
}

void Precalculare_Graf () {
    sort(a+1, a+N+1, cmp);

    for (int i = 1; i <= N; ++ i ) {
        int st = 1, dr = i-1;
        int ind = -1;

        while (st <= dr) {
            int mij = (st + dr) / 2;

            if (a[mij].x > a[i].x+1) st = mij + 1;
            else if (a[mij].x < a[i].x+1) dr = mij - 1;
            else {
                if (a[mij].y < a[i].y) dr = mij - 1;
                else {
                    st = mij + 1;
                    ind = mij;
                }
            }
        }

        dad[0][i] = ind;
    }

    for (int i = 1; i <= N; ++ i ) {
        if (dad[0][i] == -1) continue;

        G[dad[0][i]].push_back(i);
    }
}

void Build_Rmq (int node) {
    viz[node] = 1;

    for (int putere = 1; putere <= 20; ++ putere)
        dad[putere][node] = dad[putere-1][dad[putere-1][node]];

    for (auto it : G[node])
        Build_Rmq(it);
}

int Who (int K, int node) {
    int ans = node;

    for (int putere = 0; putere <= 20 && ans != -1; ++ putere )
        if ((K&(1<<putere)))
            ans = dad[putere][ans];

    return ans;
}

void Solve () {
    cin >> T;
    for (; T; -- T ) {
        int x, y, End_x, End_y;

        cin >> x >> y >> End_x >> End_y;

        if (x > End_x) {
            cout << "No" << '\n';
            continue;
        }
        else if (x == End_x) {
            if (y <= End_y)
                cout << "Yes" << '\n';
            else cout << "No" << '\n';

            continue;
        }

        int st = 1, dr = N;
        int ind = -1;
        while (st <= dr) {
            int mij = (st + dr) / 2;

            if (a[mij].x > x) st = mij + 1;
            else if (a[mij].x < x) dr = mij - 1;
            else {
                if (a[mij].y < y) dr = mij - 1;
                else {
                    ind = mij;
                    st = mij+1;
                }
            }
        }

        int node = Who(End_x - x - 1, ind);

        if (node != -1 && a[node].y <= End_y)
            cout << "Yes\n";
        else cout << "No\n";
    }
}

int main()
{
    Read();

    Precalculare_Graf();

    for (int i = 1; i <= N; ++ i )
        if (!viz[i]) Build_Rmq(i);

    Solve();

    return 0;
}

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