Submission #869462

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
869462	2023-11-04T11:58:35 Z	Hakiers	Monochrome Points (JOI20_monochrome)	C++17	25 / 100	270 ms	604 KB

monochrome

#include <bits/stdc++.h>
using namespace std;
const int BASE = 1 << 11;
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	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	1 ms	348 KB	Output is correct
4	Correct	1 ms	344 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	1 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	604 KB	Output is correct
10	Correct	1 ms	348 KB	Output is correct
11	Correct	0 ms	348 KB	Output is correct
12	Correct	0 ms	344 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct

Subtask #2
21.0 / 21.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	1 ms	348 KB	Output is correct
4	Correct	1 ms	344 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	1 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	604 KB	Output is correct
10	Correct	1 ms	348 KB	Output is correct
11	Correct	0 ms	348 KB	Output is correct
12	Correct	0 ms	344 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	5 ms	348 KB	Output is correct
15	Correct	5 ms	348 KB	Output is correct
16	Correct	5 ms	464 KB	Output is correct
17	Correct	5 ms	348 KB	Output is correct
18	Correct	4 ms	348 KB	Output is correct
19	Correct	4 ms	348 KB	Output is correct
20	Correct	4 ms	348 KB	Output is correct
21	Correct	4 ms	348 KB	Output is correct
22	Correct	4 ms	480 KB	Output is correct
23	Correct	2 ms	480 KB	Output is correct
24	Correct	4 ms	348 KB	Output is correct
25	Correct	3 ms	348 KB	Output is correct
26	Correct	4 ms	484 KB	Output is correct
27	Correct	4 ms	348 KB	Output is correct
28	Correct	4 ms	348 KB	Output is correct
29	Correct	4 ms	348 KB	Output is correct
30	Correct	4 ms	348 KB	Output is correct
31	Correct	5 ms	480 KB	Output is correct
32	Correct	4 ms	348 KB	Output is correct
33	Correct	5 ms	484 KB	Output is correct

Subtask #3
0.0 / 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
3	Correct	1 ms	348 KB	Output is correct
4	Correct	1 ms	344 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	1 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	604 KB	Output is correct
10	Correct	1 ms	348 KB	Output is correct
11	Correct	0 ms	348 KB	Output is correct
12	Correct	0 ms	344 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	5 ms	348 KB	Output is correct
15	Correct	5 ms	348 KB	Output is correct
16	Correct	5 ms	464 KB	Output is correct
17	Correct	5 ms	348 KB	Output is correct
18	Correct	4 ms	348 KB	Output is correct
19	Correct	4 ms	348 KB	Output is correct
20	Correct	4 ms	348 KB	Output is correct
21	Correct	4 ms	348 KB	Output is correct
22	Correct	4 ms	480 KB	Output is correct
23	Correct	2 ms	480 KB	Output is correct
24	Correct	4 ms	348 KB	Output is correct
25	Correct	3 ms	348 KB	Output is correct
26	Correct	4 ms	484 KB	Output is correct
27	Correct	4 ms	348 KB	Output is correct
28	Correct	4 ms	348 KB	Output is correct
29	Correct	4 ms	348 KB	Output is correct
30	Correct	4 ms	348 KB	Output is correct
31	Correct	5 ms	480 KB	Output is correct
32	Correct	4 ms	348 KB	Output is correct
33	Correct	5 ms	484 KB	Output is correct
34	Runtime error	270 ms	480 KB	Execution killed with signal 11
35	Halted	0 ms	0 KB	-

Subtask #4
0.0 / 65.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	1 ms	348 KB	Output is correct
4	Correct	1 ms	344 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	1 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	604 KB	Output is correct
10	Correct	1 ms	348 KB	Output is correct
11	Correct	0 ms	348 KB	Output is correct
12	Correct	0 ms	344 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	5 ms	348 KB	Output is correct
15	Correct	5 ms	348 KB	Output is correct
16	Correct	5 ms	464 KB	Output is correct
17	Correct	5 ms	348 KB	Output is correct
18	Correct	4 ms	348 KB	Output is correct
19	Correct	4 ms	348 KB	Output is correct
20	Correct	4 ms	348 KB	Output is correct
21	Correct	4 ms	348 KB	Output is correct
22	Correct	4 ms	480 KB	Output is correct
23	Correct	2 ms	480 KB	Output is correct
24	Correct	4 ms	348 KB	Output is correct
25	Correct	3 ms	348 KB	Output is correct
26	Correct	4 ms	484 KB	Output is correct
27	Correct	4 ms	348 KB	Output is correct
28	Correct	4 ms	348 KB	Output is correct
29	Correct	4 ms	348 KB	Output is correct
30	Correct	4 ms	348 KB	Output is correct
31	Correct	5 ms	480 KB	Output is correct
32	Correct	4 ms	348 KB	Output is correct
33	Correct	5 ms	484 KB	Output is correct
34	Runtime error	270 ms	480 KB	Execution killed with signal 11
35	Halted	0 ms	0 KB	-

Submission #869462

Compilation message

Subtask #1 4.0 / 4.0

Subtask #2 21.0 / 21.0

Subtask #3 0.0 / 10.0

Subtask #4 0.0 / 65.0

Subtask #1
4.0 / 4.0

Subtask #2
21.0 / 21.0

Subtask #3
0.0 / 10.0

Subtask #4
0.0 / 65.0