Submission #920881

#	Time	Username	Problem	Language	Result	Execution time	Memory
920881		siewjh	Trampoline (info1cup20_trampoline)	C++17	100 / 100	758 ms	51780 KiB

trampoline

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 200005;
int rv[MAXN], cv[MAXN], nxt[MAXN][20];
map<int, vector<pair<int, int>>> m;
int xpar(int a, int x){
	for (int k = 19; k >= 0; k--){
		if (a == -1) break;
		if (x & (1 << k)) a = nxt[a][k];
	}
	return a;
}
bool solve(){
	int sr, sc, er, ec; cin >> sr >> sc >> er >> ec;
	if (er < sr || ec < sc) return 0;
	if (er == sr) return 1;
	if (!m.count(sr)) return 0;
	auto it = lower_bound(m[sr].begin(), m[sr].end(), make_pair(sc, -1));
	if (it == m[sr].end()) return 0;
	int finc = xpar(it->second, er - sr - 1);
	if (finc == -1) return 0;
	return cv[finc] <= ec;
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	int rows, cols, nums; cin >> rows >> cols >> nums;
	for (int i = 0; i < nums; i++){
		int r, c; cin >> r >> c;
		rv[i] = r; cv[i] = c;
		m[r].push_back({c, i});
	}
	for (auto &[r, v] : m) sort(v.begin(), v.end());
	for (int i = 0; i < nums; i++){
		int r = rv[i], c = cv[i];
		if (!m.count(r + 1)) nxt[i][0] = -1;
		else{
			auto it = lower_bound(m[r + 1].begin(), m[r + 1].end(), make_pair(c, -1));
			if (it == m[r + 1].end()) nxt[i][0] = -1;
			else nxt[i][0] = it->second;
		}
	}
	for (int k = 1; k <= 19; k++)
		for (int i = 0; i < nums; i++){
			if (nxt[i][k - 1] == -1) nxt[i][k] = -1;
			else nxt[i][k] = nxt[nxt[i][k - 1]][k - 1];
		}
	int queries; cin >> queries;
	while (queries--) cout << (solve() ? "Yes" : "No") << '\n';
}

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