oj.uz

Submission #991481

# Submission time Handle Problem Language Result Execution time Memory
991481 2024-06-02T09:51:10 Z goats_9 Sails (IOI07_sails) C++17
60 / 100
 70 ms 3164 KB 
/* Author: goats_9 */

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

#define LSOne(s) (s & -(s))

class BIT {
	int n;
	vector<ll> values;

public:
	BIT(int _n) : n(_n), values(n + 1, 0LL) {}

	void update(int l, int r, int v) {
		if (r <= l) return;
		for (; l <= n; l += LSOne(l)) values[l] += v;
		for (; r <= n; r += LSOne(r)) values[r] -= v;
	}

	ll query(int i) {
		if (i > n) return -1;
		ll ret = 0;
		for (; i; i -= LSOne(i)) ret += values[i];
		return ret;
	}
};

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n;
	cin >> n;
	BIT ft(n);
	vector<array<int, 2>> mast(n);
	for (int i = 0; i < n; i++) cin >> mast[i][0] >> mast[i][1];
	sort(mast.begin(), mast.end());
	for (auto [h, k] : mast) {
		int ht = ft.query(h - k + 1);
		int l = 0, r = h;
		while (r - l > 1) {
			int g = (l + r) / 2;
			if (ft.query(g) > ht) l = g;
			else r = g;
		}
		int l1 = r;
		l = 1, r = h + 1;
		while (r - l > 1) {
			int g = (l + r) / 2;
			if (ft.query(g) >= ht) l = g;
			else r = g;
		}
		ft.update(r, h + 1, 1);
		ft.update(l1, l1 + k + r - h - 1, 1);
	}
	ll ans = 0;
	for (int i = 1; i <= n; i++) {
		ll u = ft.query(i);
		ans += u*(u - 1)/2;
	}
	cout << ans;
	return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 500 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 604 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 1112 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 1628 KB Output is correct

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 46 ms 2504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 53 ms 2904 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 3164 KB Output is correct
2 Correct 49 ms 2908 KB Output is correct