oj.uz

Submission #1087899

# Submission time Handle Problem Language Result Execution time Memory
1087899 2024-09-13T11:27:28 Z vuavisao Mountains (NOI20_mountains) C++14
24 / 100
 106 ms 12076 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("O3", "unroll-loops")
using namespace std;

using ll = long long;

const int N = 300'000 + 10;

struct FenWick {
	int n_node = 0;
	vector<int> tree = {};

	void resize(int n) { n_node = n; tree.resize(n + 10, 0); }
	FenWick() {};
	FenWick(int n) { this -> resize(n); };

	void Update(int idx, int val) {
		for( ; idx <= n_node; idx += (idx & - idx)) tree[idx] += val;
		return;
	}

	int Query(int idx) {
		int res = 0;
		for( ; idx > 0; idx -= (idx & - idx)) res += tree[idx];
		return res;
	}

	int Sum_to(int l, int r) {
		if(l > r) return 0;
		return Query(r) - Query(l - 1);
	}

	int kth(int val) {
		int res = 0, s = 0;
		for(int mask = 30; mask >= 0; -- mask) {
			int nxt = res | (1 << mask);
			if(nxt < n_node && s + tree[nxt] < val) {
				res = nxt;
				s += tree[nxt];
			}
		}
		++ res; return res;
	}

	void reset(int idx) {
		for ( ; idx <= n_node; idx += (idx & - idx)) tree[idx] = 0;
		return;
	}
};

int n;
ll a[N];

int L[N], R[N];

void compress() {
	vector<int> Pos = {};
	for (int i = 1; i <= n; ++ i) {
		Pos.push_back(a[i]);
	}
	
	sort(Pos.begin(), Pos.end());
	Pos.resize(unique(Pos.begin(), Pos.end()) - Pos.begin());

	for (int i = 1; i <= n; ++ i) {
		a[i] = lower_bound(Pos.begin(), Pos.end(), a[i]) - Pos.begin() + 1;
	}
}

void calc(int cnt[]) {
	FenWick bit(n);
	for (int i = 1; i <= n; ++ i) {
		cnt[i] = bit.Query(a[i]);
		bit.Update(a[i] + 1, 1);
	}
}

int32_t main() {
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(nullptr); std::cout.tie(nullptr);
	cin >> n;
	for (int i = 1; i <= n; ++ i) cin >> a[i];
	compress();
	calc(L);
	reverse(a + 1, a + 1 + n);
	calc(R);
	ll res = 0;
	for (int i = 1; i <= n; ++ i) res += 1ll * L[i] * R[n - i + 1];
	cout << res;
	return (0 ^ 0);
}

/// Code by vuavisao

Subtask #1
2.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 67 ms 11796 KB Output is correct
3 Correct 67 ms 11816 KB Output is correct
4 Correct 64 ms 11808 KB Output is correct
5 Correct 68 ms 12076 KB Output is correct
6 Correct 65 ms 11828 KB Output is correct
7 Correct 67 ms 11844 KB Output is correct
8 Correct 75 ms 11828 KB Output is correct
9 Correct 57 ms 11828 KB Output is correct
10 Correct 57 ms 11816 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 6708 KB Output is correct
2 Correct 42 ms 6708 KB Output is correct
3 Correct 47 ms 6688 KB Output is correct
4 Correct 48 ms 6712 KB Output is correct
5 Correct 46 ms 6712 KB Output is correct
6 Correct 41 ms 6716 KB Output is correct
7 Correct 41 ms 6736 KB Output is correct
8 Correct 36 ms 6768 KB Output is correct
9 Correct 34 ms 6768 KB Output is correct
10 Correct 0 ms 344 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 6708 KB Output is correct
2 Correct 42 ms 6708 KB Output is correct
3 Correct 47 ms 6688 KB Output is correct
4 Correct 48 ms 6712 KB Output is correct
5 Correct 46 ms 6712 KB Output is correct
6 Correct 41 ms 6716 KB Output is correct
7 Correct 41 ms 6736 KB Output is correct
8 Correct 36 ms 6768 KB Output is correct
9 Correct 34 ms 6768 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 48 ms 7132 KB Output is correct
12 Correct 49 ms 6968 KB Output is correct
13 Correct 48 ms 6968 KB Output is correct
14 Correct 48 ms 6968 KB Output is correct
15 Correct 49 ms 6964 KB Output is correct
16 Correct 51 ms 7176 KB Output is correct
17 Correct 52 ms 6960 KB Output is correct
18 Correct 32 ms 6964 KB Output is correct
19 Correct 34 ms 6948 KB Output is correct
20 Correct 1 ms 348 KB Output is correct

Subtask #4
0 / 36.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 28.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 6708 KB Output is correct
2 Correct 42 ms 6708 KB Output is correct
3 Correct 47 ms 6688 KB Output is correct
4 Correct 48 ms 6712 KB Output is correct
5 Correct 46 ms 6712 KB Output is correct
6 Correct 41 ms 6716 KB Output is correct
7 Correct 41 ms 6736 KB Output is correct
8 Correct 36 ms 6768 KB Output is correct
9 Correct 34 ms 6768 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 48 ms 7132 KB Output is correct
12 Correct 49 ms 6968 KB Output is correct
13 Correct 48 ms 6968 KB Output is correct
14 Correct 48 ms 6968 KB Output is correct
15 Correct 49 ms 6964 KB Output is correct
16 Correct 51 ms 7176 KB Output is correct
17 Correct 52 ms 6960 KB Output is correct
18 Correct 32 ms 6964 KB Output is correct
19 Correct 34 ms 6948 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 95 ms 7984 KB Output is correct
22 Correct 106 ms 7988 KB Output is correct
23 Correct 93 ms 7996 KB Output is correct
24 Correct 91 ms 7988 KB Output is correct
25 Correct 92 ms 7972 KB Output is correct
26 Correct 95 ms 7984 KB Output is correct
27 Correct 92 ms 7984 KB Output is correct
28 Correct 50 ms 7820 KB Output is correct
29 Correct 43 ms 7824 KB Output is correct
30 Correct 0 ms 348 KB Output is correct

Subtask #7
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 67 ms 11796 KB Output is correct
3 Correct 67 ms 11816 KB Output is correct
4 Correct 64 ms 11808 KB Output is correct
5 Correct 68 ms 12076 KB Output is correct
6 Correct 65 ms 11828 KB Output is correct
7 Correct 67 ms 11844 KB Output is correct
8 Correct 75 ms 11828 KB Output is correct
9 Correct 57 ms 11828 KB Output is correct
10 Correct 57 ms 11816 KB Output is correct
11 Correct 43 ms 6708 KB Output is correct
12 Correct 42 ms 6708 KB Output is correct
13 Correct 47 ms 6688 KB Output is correct
14 Correct 48 ms 6712 KB Output is correct
15 Correct 46 ms 6712 KB Output is correct
16 Correct 41 ms 6716 KB Output is correct
17 Correct 41 ms 6736 KB Output is correct
18 Correct 36 ms 6768 KB Output is correct
19 Correct 34 ms 6768 KB Output is correct
20 Correct 0 ms 344 KB Output is correct
21 Correct 48 ms 7132 KB Output is correct
22 Correct 49 ms 6968 KB Output is correct
23 Correct 48 ms 6968 KB Output is correct
24 Correct 48 ms 6968 KB Output is correct
25 Correct 49 ms 6964 KB Output is correct
26 Correct 51 ms 7176 KB Output is correct
27 Correct 52 ms 6960 KB Output is correct
28 Correct 32 ms 6964 KB Output is correct
29 Correct 34 ms 6948 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Incorrect 1 ms 344 KB Output isn't correct
32 Halted 0 ms 0 KB -