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Submission #869491

# Submission time Handle Problem Language Result Execution time Memory
869491 2023-11-04T12:57:59 Z Hakiers Monochrome Points (JOI20_monochrome) C++17
35 / 100
 2000 ms 6348 KB 
#include <bits/stdc++.h>
using namespace std;
const int BASE = 1 << 19;
int TREE[BASE << 1];
int n;
string monochrome;
queue<int> BPOS;
queue<int> WPOS;

void add(int v, int val){
	v+=BASE;
	TREE[v] += val;
	v/=2;
	while(v > 0){
		int l = 2*v, r = 2*v+1;
		TREE[v] = TREE[l] + TREE[r];
		v/=2;
	}
}
int query(int a, int b){
	a += BASE - 1;
	b += BASE + 1;
	
	int res = 0;
	while(a/2 != b/2){
		if(!(a&1)) res += TREE[a+1];
		if(b&1) res += TREE[b-1];
		a/=2; b/=2;
	}
	return res;
}

void treeclear(){
	for(int i = 0; i < (BASE << 1); i++)
		TREE[i] = 0;

}

int solve(int wsp){
	treeclear();

	for(int i = n+wsp; i >= 1 + wsp; i--){
		if(monochrome[i] == 'B')
			BPOS.push(i);
		else if(monochrome[i] == 'W')
			WPOS.push(i);
	}
	
	int res = 0;
	
	for(int i = 2*n+wsp; i >= n+1 + wsp; i--){
		if(monochrome[i] == 'B'){
			int v = WPOS.front();
			WPOS.pop();
			//cout << "query: " << query(v, BASE-1) << "\n";
			res += query(v, BASE-1);
			add(v, 1);
		}
		else if(monochrome[i] == 'W'){
			int v = BPOS.front();
			BPOS.pop();
			//cout << "query: " << query(v, BASE-1) << "\n";
			res += query(v, BASE-1);
			add(v, 1);
		}
	}

	return res;
}

int best(){
	int res = 0;
	
	for(int i = 0; i <= n; i++)
		res = max(res, solve(i));
	return res;

}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	cin >> monochrome;
	monochrome = monochrome + monochrome;
	monochrome = "#" + monochrome;
	
	/*
	for(int i = n; i >= 1; i--){
		if(monochrome[i] == 'B')
			BPOS.push(i);
		else if(monochrome[i] == 'W')
			WPOS.push(i);
	}
	*/
	cout << best() << "\n";

}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4440 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 2 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 2 ms 4444 KB Output is correct
8 Correct 2 ms 4444 KB Output is correct
9 Correct 2 ms 4444 KB Output is correct
10 Correct 2 ms 4440 KB Output is correct
11 Correct 2 ms 4444 KB Output is correct
12 Correct 2 ms 4444 KB Output is correct
13 Correct 2 ms 4564 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4440 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 2 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 2 ms 4444 KB Output is correct
8 Correct 2 ms 4444 KB Output is correct
9 Correct 2 ms 4444 KB Output is correct
10 Correct 2 ms 4440 KB Output is correct
11 Correct 2 ms 4444 KB Output is correct
12 Correct 2 ms 4444 KB Output is correct
13 Correct 2 ms 4564 KB Output is correct
14 Correct 28 ms 4564 KB Output is correct
15 Correct 29 ms 4440 KB Output is correct
16 Correct 27 ms 4444 KB Output is correct
17 Correct 26 ms 4444 KB Output is correct
18 Correct 25 ms 4440 KB Output is correct
19 Correct 26 ms 4568 KB Output is correct
20 Correct 25 ms 4444 KB Output is correct
21 Correct 23 ms 4444 KB Output is correct
22 Correct 24 ms 4564 KB Output is correct
23 Correct 17 ms 4444 KB Output is correct
24 Correct 23 ms 4564 KB Output is correct
25 Correct 22 ms 4444 KB Output is correct
26 Correct 24 ms 4444 KB Output is correct
27 Correct 24 ms 4560 KB Output is correct
28 Correct 27 ms 4444 KB Output is correct
29 Correct 24 ms 4444 KB Output is correct
30 Correct 26 ms 4564 KB Output is correct
31 Correct 28 ms 4560 KB Output is correct
32 Correct 26 ms 4440 KB Output is correct
33 Correct 28 ms 4444 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4440 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 2 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 2 ms 4444 KB Output is correct
8 Correct 2 ms 4444 KB Output is correct
9 Correct 2 ms 4444 KB Output is correct
10 Correct 2 ms 4440 KB Output is correct
11 Correct 2 ms 4444 KB Output is correct
12 Correct 2 ms 4444 KB Output is correct
13 Correct 2 ms 4564 KB Output is correct
14 Correct 28 ms 4564 KB Output is correct
15 Correct 29 ms 4440 KB Output is correct
16 Correct 27 ms 4444 KB Output is correct
17 Correct 26 ms 4444 KB Output is correct
18 Correct 25 ms 4440 KB Output is correct
19 Correct 26 ms 4568 KB Output is correct
20 Correct 25 ms 4444 KB Output is correct
21 Correct 23 ms 4444 KB Output is correct
22 Correct 24 ms 4564 KB Output is correct
23 Correct 17 ms 4444 KB Output is correct
24 Correct 23 ms 4564 KB Output is correct
25 Correct 22 ms 4444 KB Output is correct
26 Correct 24 ms 4444 KB Output is correct
27 Correct 24 ms 4560 KB Output is correct
28 Correct 27 ms 4444 KB Output is correct
29 Correct 24 ms 4444 KB Output is correct
30 Correct 26 ms 4564 KB Output is correct
31 Correct 28 ms 4560 KB Output is correct
32 Correct 26 ms 4440 KB Output is correct
33 Correct 28 ms 4444 KB Output is correct
34 Correct 531 ms 4564 KB Output is correct
35 Correct 517 ms 4440 KB Output is correct
36 Correct 494 ms 4568 KB Output is correct
37 Correct 473 ms 4560 KB Output is correct
38 Correct 443 ms 4444 KB Output is correct
39 Correct 502 ms 4560 KB Output is correct
40 Correct 427 ms 4560 KB Output is correct
41 Correct 399 ms 4560 KB Output is correct
42 Correct 507 ms 4564 KB Output is correct
43 Correct 516 ms 4440 KB Output is correct
44 Correct 447 ms 4560 KB Output is correct
45 Correct 493 ms 4692 KB Output is correct
46 Correct 497 ms 4564 KB Output is correct
47 Correct 505 ms 4692 KB Output is correct
48 Correct 502 ms 4560 KB Output is correct
49 Correct 447 ms 4692 KB Output is correct
50 Correct 536 ms 4560 KB Output is correct
51 Correct 539 ms 4444 KB Output is correct
52 Correct 510 ms 4556 KB Output is correct

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4440 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 2 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 2 ms 4444 KB Output is correct
8 Correct 2 ms 4444 KB Output is correct
9 Correct 2 ms 4444 KB Output is correct
10 Correct 2 ms 4440 KB Output is correct
11 Correct 2 ms 4444 KB Output is correct
12 Correct 2 ms 4444 KB Output is correct
13 Correct 2 ms 4564 KB Output is correct
14 Correct 28 ms 4564 KB Output is correct
15 Correct 29 ms 4440 KB Output is correct
16 Correct 27 ms 4444 KB Output is correct
17 Correct 26 ms 4444 KB Output is correct
18 Correct 25 ms 4440 KB Output is correct
19 Correct 26 ms 4568 KB Output is correct
20 Correct 25 ms 4444 KB Output is correct
21 Correct 23 ms 4444 KB Output is correct
22 Correct 24 ms 4564 KB Output is correct
23 Correct 17 ms 4444 KB Output is correct
24 Correct 23 ms 4564 KB Output is correct
25 Correct 22 ms 4444 KB Output is correct
26 Correct 24 ms 4444 KB Output is correct
27 Correct 24 ms 4560 KB Output is correct
28 Correct 27 ms 4444 KB Output is correct
29 Correct 24 ms 4444 KB Output is correct
30 Correct 26 ms 4564 KB Output is correct
31 Correct 28 ms 4560 KB Output is correct
32 Correct 26 ms 4440 KB Output is correct
33 Correct 28 ms 4444 KB Output is correct
34 Correct 531 ms 4564 KB Output is correct
35 Correct 517 ms 4440 KB Output is correct
36 Correct 494 ms 4568 KB Output is correct
37 Correct 473 ms 4560 KB Output is correct
38 Correct 443 ms 4444 KB Output is correct
39 Correct 502 ms 4560 KB Output is correct
40 Correct 427 ms 4560 KB Output is correct
41 Correct 399 ms 4560 KB Output is correct
42 Correct 507 ms 4564 KB Output is correct
43 Correct 516 ms 4440 KB Output is correct
44 Correct 447 ms 4560 KB Output is correct
45 Correct 493 ms 4692 KB Output is correct
46 Correct 497 ms 4564 KB Output is correct
47 Correct 505 ms 4692 KB Output is correct
48 Correct 502 ms 4560 KB Output is correct
49 Correct 447 ms 4692 KB Output is correct
50 Correct 536 ms 4560 KB Output is correct
51 Correct 539 ms 4444 KB Output is correct
52 Correct 510 ms 4556 KB Output is correct
53 Execution timed out 2016 ms 6348 KB Time limit exceeded
54 Halted 0 ms 0 KB -