Submission #387586

#	Time	Username	Problem	Language	Result	Execution time	Memory
387586		casperwang	Trampoline (info1cup20_trampoline)	C++14	100 / 100	1152 ms	54204 KiB

trampoline

#include <bits/stdc++.h>
#define pb emplace_back
#define All(x) x.begin(), x.end()
#define pii pair<int,int>
#define ff first
#define ss second
#define y1 y_1
using namespace std;
#define debug(args...) kout("[ " + string(#args) + " ]", args)
void kout() { cerr << endl; }
template <class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ',kout(b...); }
template <class T> void pary(T L, T R) { while (L != R) cerr << *L << " \n"[++L==R]; }

const int MAXN = 200000;
const int L = 30;
int N, R, C, T;
pii pts[MAXN+1];
int x1, y1, x2, y2;
map <int, set<pii>> arr;
int anc[MAXN+1][L];

void build() {
	for (int i = 1; i <= N; i++) {
		auto [x, y] = pts[i];
		arr[x].insert(pii(y, i));
	}
	for (int i = 1; i <= N; i++) {
		auto [x, y] = pts[i];
		if (!arr.count(x-1)) continue;
		auto it = arr[x-1].upper_bound(pii(y, N+1));
		if (it != arr[x-1].begin()) {
			anc[i][0] = prev(it)->ss;
		}
	}
	for (int i = 1; i < L; i++) {
		for (int j = 1; j <= N; j++) {
			anc[j][i] = anc[anc[j][i-1]][i-1];
		}
	}
}

bool solve(int x1, int y1, int x2, int y2) {
	if (x1 == x2 && y1 <= y2) return true;
	if (y1 > y2 || x1 > x2) return false;
	if (!arr.count(x2-1)) return false;
	auto it = arr[x2-1].upper_bound(pii(y2, N+1));
	if (it == arr[x2-1].begin()) return false;
	int now = prev(it)->ss;
	int K = x2 - x1 - 1;
	for (int i = 1; i <= K; i *= 2) {
		if (i & K) now = anc[now][__lg(i)];
	}
	return now && pts[now].ss >= y1;
}

signed main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> R >> C >> N;
	for (int i = 1; i <= N; i++) {
		auto &[x, y] = pts[i];
		cin >> x >> y;
	}
	build();
	cin >> T;
	for (int i = 1; i <= T; i++) {
		cin >> x1 >> y1 >> x2 >> y2;
		cout << (solve(x1, y1, x2, y2) ? "Yes" : "No") << '\n';
	}
}

Compilation message (stderr)

trampoline.cpp: In function 'void build()':
trampoline.cpp:24:8: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   24 |   auto [x, y] = pts[i];
      |        ^
trampoline.cpp:28:8: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   28 |   auto [x, y] = pts[i];
      |        ^
trampoline.cpp: In function 'int main()':
trampoline.cpp:60:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   60 |   auto &[x, y] = pts[i];
      |         ^

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