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Submission #531807

# Submission time Handle Problem Language Result Execution time Memory
531807 2022-03-01T14:46:44 Z Servus2022 Index (COCI21_index) C++14
110 / 110
 851 ms 9924 KB 
#include <bits/stdc++.h>
#define ub(x) (x&(-x))

using namespace std;

constexpr int NMAX = 2e5 + 5;

int Bucket;
struct intrebare {
	int L, R;
	int ind;

	bool operator < (const intrebare &other) const {
		return (L / Bucket < other.L / Bucket) || (L / Bucket == other.L / Bucket && R < other.R);
	}
};

intrebare quer[NMAX];

int N, Q;

int aib[NMAX];
int A[NMAX];

void Update (int pos, int val) {
	for (int i = pos; i <= N; i += ub(i))
		aib[i] += val;
}

int Query (int pos) {
	int S = 0;

	for (int i = pos; i; i -= ub(i))
		S += aib[i];

	return S;
}

void Read () {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);

	cin >> N >> Q;

	Bucket = Q / sqrt(N);
	for (int i = 1; i <= N; ++ i )
		cin >> A[i];

	for (int i = 1; i <= Q; ++ i ) {
		cin >> quer[i].L >> quer[i].R;
		quer[i].ind = i;
	}

	sort(quer+1, quer+Q+1);
}

int sol[NMAX];

void Add (int pos) {
	Update(A[pos], +1);
}

void Elimin (int pos) {
	Update(A[pos], -1);
}

int Raspuns (int Total) {
    int st = 1, dr = N;
	int ans = 1;

    while (st <= dr) {
		int mij = (st + dr) / 2;
		int cnt = Query(mij-1);

		if (Total - cnt >= mij) {
			st = mij + 1;
			ans = mij;
		}
		else dr = mij - 1;
    }

    return ans;
}

/*
dp[i][j] - i cifre cu ultimele 4 cifre j
dp[i][j] = max(dp[i-1][jprim]) + 1 (j este lucky)

i cifre :     a b c m
i-1 cifre:  n a b c

dp[i][j][k][l][m] = max(dp[i-1][aux][j][k][l]) + 1
*/


void Solve () {
    int st = 1, dr = 0;

    for (int i = 1; i <= Q; ++ i ) {
        while (dr < quer[i].R) {
            ++ dr;
            Add(dr);
        }

        while (st > quer[i].L) {
			-- st;
			Add(st);
        }

        while (st < quer[i].L) {
			Elimin(st);
			++ st;
        }

        while (dr > quer[i].R) {
			Elimin(dr);
			-- dr;
        }

        sol[quer[i].ind] = Raspuns(quer[i].R - quer[i].L + 1);
    }

    for (int i = 1; i <= Q; ++ i )
		cout << sol[i] << '\n';
}

int main () {
	Read();
	Solve();

	return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 324 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 324 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 110 ms 2516 KB Output is correct
12 Correct 104 ms 2560 KB Output is correct
13 Correct 103 ms 2496 KB Output is correct
14 Correct 102 ms 2492 KB Output is correct
15 Correct 102 ms 2564 KB Output is correct
16 Correct 103 ms 2556 KB Output is correct
17 Correct 100 ms 2500 KB Output is correct
18 Correct 105 ms 2500 KB Output is correct
19 Correct 103 ms 2560 KB Output is correct
20 Correct 104 ms 2560 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 324 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 110 ms 2516 KB Output is correct
12 Correct 104 ms 2560 KB Output is correct
13 Correct 103 ms 2496 KB Output is correct
14 Correct 102 ms 2492 KB Output is correct
15 Correct 102 ms 2564 KB Output is correct
16 Correct 103 ms 2556 KB Output is correct
17 Correct 100 ms 2500 KB Output is correct
18 Correct 105 ms 2500 KB Output is correct
19 Correct 103 ms 2560 KB Output is correct
20 Correct 104 ms 2560 KB Output is correct
21 Correct 820 ms 9924 KB Output is correct
22 Correct 805 ms 9876 KB Output is correct
23 Correct 811 ms 9844 KB Output is correct
24 Correct 807 ms 9852 KB Output is correct
25 Correct 827 ms 9848 KB Output is correct
26 Correct 851 ms 9844 KB Output is correct
27 Correct 816 ms 9844 KB Output is correct
28 Correct 830 ms 9904 KB Output is correct
29 Correct 814 ms 9844 KB Output is correct
30 Correct 828 ms 9856 KB Output is correct