Submission #698583

#	Time	Username	Problem	Language	Result	Execution time	Memory
698583		hazzle	Trampoline (info1cup20_trampoline)	C++17	42 / 100	2092 ms	46088 KiB

trampoline

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define fi first
#define se second
#define all(m) (m).begin(), (m).end()
#define rall(m) (m).rbegin(), (m).rend()
#define vec vector
#define sz(a) (int) (a).size()
#define mpp make_pair
#define mtt make_tuple

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair <int, int> pii;
typedef tuple <int, int, int> tui;

template <typename T> bool umin(T &a, T b) { return a > b ? a = b, 1 : 0; }
template <typename T> bool umax(T &a, T b) { return a < b ? a = b, 1 : 0; }

const int N = 2e5 + 42, L = 18;
const int inf = 1e9 + 42;

bool dbg = 1;

int solve(){
        int r, c, n;
        cin >> r >> c >> n;
        vec <pii> a(n);
        map <pii, int> id;
        map <int, vec <int>> v;
        vec <int> xs(n);
        for (int i = 0; i < n; ++i){
                auto &[x, y] = a[i];
                cin >> x >> y;
                id[{x, y}] = i;
                v[x].push_back(y);
                xs[i] = x;
        }

        for (auto &[x, c]: v) sort(all(c));

        auto nxt = [&](int x, int y){
                if (v[x].empty()) return -1;
                auto it = lower_bound(all(v[x]), y);
                return it == v[x].end() ? -1 : id[mpp(x, *it)];
        };

        vec <int> go(n, -1);

        for (int i = 0; i < n; ++i){
                auto [x, y] = a[i];
                if (~nxt(x + 1, y)){
                        go[i] = nxt(x + 1, y);
                }
                else if (~nxt(x, y + 1)){
                        go[i] = nxt(x, y + 1);
                }
        }

        vec <vec <int>> up(n, vec <int> (L, -1));

        sort(rall(xs));
        for (auto &x: xs){
                for (int pt = sz(v[x]) - 1; ~pt; --pt){
                        int y = v[x][pt];
                        int u = id[{x, y}], v = go[u];
                        if (!~v) continue;
                        if (a[u].fi + 1 == a[v].fi){
                                up[u][0] = v;
                                int cv = up[v][0];
                                for (int l = 1; l < L; ++l){
                                        if (!~cv) break;
                                        up[u][l] = cv, cv = up[cv][l];
                                }
                        }
                        else up[u] = up[v];
                }
        }

        int q; cin >> q;
        while(q--){
                int sx, sy, tx, ty;
                cin >> sx >> sy >> tx >> ty;
                if (tx < sx || ty < sy){
                        cout << "No\n";
                        continue;
                }
                if (sx == tx){
                        cout << "Yes\n";
                        continue;
                }
                int u = nxt(sx, sy);
                int dst = tx - sx - 1;
                if (dst >= n){
                        cout << "No\n";
                        continue;
                }
                for (int l = 0; l < L; ++l){
                        if (!~u) break;
                        if (dst >> l & 1){
                                u = up[u][l];
                        }
                }
                cout << (!~u || a[u].se > ty ? "No\n" : "Yes\n");
        }

        return 0;
}

signed main(){
        ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
        int tst = 1; //cin >> tst;
        while(tst--) solve();
        return 0;
}

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