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Submission #954439

# Submission time Handle Problem Language Result Execution time Memory
954439 2024-03-27T22:49:09 Z TAhmed33 Event Hopping (BOI22_events) C++
25 / 100
 1500 ms 8428 KB 
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 25;
const int B = 18;
int dp[B][MAXN];
int n, q;
pair <int, int> a[MAXN];
int jump (int a, int b) {
	for (int i = B - 1; i >= 0; i--) {
		if (b & (1 << i)) {
			a = dp[i][a];
		}
	}
	return a;
}
int main () {
	ios::sync_with_stdio(0); cin.tie(0);
	cin >> n >> q;
	for (int i = 1; i <= n; i++) {
		cin >> a[i].first >> a[i].second;
	}
	for (int i = 1; i <= n; i++) {
		dp[0][i] = i;
		for (int j = 1; j <= n; j++) {
			if (a[j].second >= a[i].first && a[j].second <= a[i].second) {
				if (a[j].first < a[dp[0][i]].first) dp[0][i] = j;
			}
		}
	}
	for (int i = 1; i < B; i++) {
		for (int j = 1; j <= n; j++) {
			dp[i][j] = dp[i - 1][dp[i - 1][j]];
		}
	}
	while (q--) {
		int x, y; cin >> x >> y;
		if (x == y) {
			cout << "0\n";
			continue;
		}
		int l = 0, r = (1 << (B + 1)) - 1, ans = -1;
		while (l <= r) {
			int mid = (l + r) / 2;
			int z = jump(y, mid);
			if (z == 0) {
				r = mid - 1; continue;
			}
			if (a[z].first > a[x].second) {
				l = mid + 1; ans = mid;
			} else {
				r = mid - 1;
			}
		}
		y = jump(y, ans + 1);
		if (a[x].second <= a[y].second && a[x].second >= a[y].first) {
			cout << ans + 2 << '\n';
		} else {
			cout << "impossible\n";
		}
	}
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Execution timed out 1545 ms 4600 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6492 KB Output is correct
2 Correct 1 ms 6608 KB Output is correct
3 Correct 4 ms 6624 KB Output is correct
4 Correct 4 ms 6492 KB Output is correct
5 Correct 5 ms 6492 KB Output is correct
6 Correct 4 ms 6644 KB Output is correct
7 Correct 5 ms 6492 KB Output is correct
8 Correct 5 ms 6648 KB Output is correct
9 Correct 2 ms 6492 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6492 KB Output is correct
2 Correct 1 ms 6608 KB Output is correct
3 Correct 4 ms 6624 KB Output is correct
4 Correct 4 ms 6492 KB Output is correct
5 Correct 5 ms 6492 KB Output is correct
6 Correct 4 ms 6644 KB Output is correct
7 Correct 5 ms 6492 KB Output is correct
8 Correct 5 ms 6648 KB Output is correct
9 Correct 2 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6488 KB Output is correct
12 Correct 4 ms 6488 KB Output is correct
13 Correct 4 ms 6492 KB Output is correct
14 Correct 4 ms 6616 KB Output is correct
15 Correct 4 ms 6492 KB Output is correct
16 Correct 5 ms 6488 KB Output is correct
17 Correct 4 ms 6488 KB Output is correct
18 Correct 2 ms 6488 KB Output is correct
19 Correct 167 ms 7964 KB Output is correct
20 Correct 146 ms 7996 KB Output is correct
21 Correct 154 ms 8344 KB Output is correct
22 Correct 144 ms 8428 KB Output is correct
23 Correct 156 ms 8276 KB Output is correct
24 Correct 135 ms 8164 KB Output is correct
25 Correct 140 ms 8004 KB Output is correct

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6492 KB Output is correct
2 Correct 1 ms 6608 KB Output is correct
3 Correct 4 ms 6624 KB Output is correct
4 Correct 4 ms 6492 KB Output is correct
5 Correct 5 ms 6492 KB Output is correct
6 Correct 4 ms 6644 KB Output is correct
7 Correct 5 ms 6492 KB Output is correct
8 Correct 5 ms 6648 KB Output is correct
9 Correct 2 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 4 ms 6492 KB Output is correct
13 Correct 4 ms 6492 KB Output is correct
14 Correct 3 ms 6492 KB Output is correct
15 Correct 4 ms 6492 KB Output is correct
16 Correct 5 ms 6624 KB Output is correct
17 Correct 4 ms 6492 KB Output is correct
18 Correct 2 ms 6492 KB Output is correct
19 Execution timed out 1558 ms 4444 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1559 ms 4700 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Execution timed out 1545 ms 4600 KB Time limit exceeded
3 Halted 0 ms 0 KB -