oj.uz

Submission #962371

# Submission time Handle Problem Language Result Execution time Memory
962371 2024-04-13T11:27:24 Z 0npata Monochrome Points (JOI20_monochrome) C++17
25 / 100
 105 ms 556 KB 
#include<bits/stdc++.h>
using namespace std;

#define int long long
#define vec vector
#define pi pair<int, int>
#define fst first
#define snd second
#define pb push_back

int n;
string s;
int mes(vec<pi> p) {
	int res = 0;

	int j = p[0].fst;
	int k = p[0].fst;

	int cntw = 1;
	int cntb = 0;

	for(int i = 0; i<n; i++) {
		while(k != p[i].fst) {
			cntw -= s[k]=='W';
			cntb -= s[k] == 'B';
			k+=1;
			k %= 2*n;
		}
		while(j != p[i].snd) {
			j += 1;
			j %= 2*n;
			cntw += s[j]=='W';
			cntb += s[j] == 'B';
		}
		int rw = cntw-1;
		int orb = n-cntb;
		res += min(rw, orb);
	}

	return res;
}

int32_t main() {
	cin >> n;
	cin >> s;

	vec<int> b(0);
	vec<int> w(0);

	for(int i = 0; i<s.size(); i++) {
		if(s[i] == 'W') {
			w.pb(i);
		}
		else {
			b.pb(i);
		}
	}

	int ans = 0;

	const int SQRTN = 600;


	int cand = 0;
	int mx = 0;

	for(int i = 0; i<n; i+=SQRTN) {
		// construct possible pairings
		vec<pi> p;
		for(int j = 0; j<n; j++) {
			p.pb({w[j], b[(j+i)%n]});
		}
		int res = mes(p);

		if(res > mx) cand = i;
	}

	for(int i = max(cand-SQRTN, -n); i<cand; i++) {

		vec<pi> p;
		for(int j = 0; j<n; j++) {
			p.pb({w[j], b[(j+i+n)%n]});
		}

		int res = mes(p);
		ans = max(res, ans);
	}
	for(int i = cand; i<cand+SQRTN; i++) {
		vec<pi> p;
		for(int j = 0; j<n; j++) {
			p.pb({w[j], b[(j+i)%n]});
		}

		int res = mes(p);
		ans = max(res, ans);
	}


	cout << ans << '\n';
}

Compilation message

monochrome.cpp: In function 'int32_t main()':
monochrome.cpp:50:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |  for(int i = 0; i<s.size(); i++) {
      |                 ~^~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 432 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 372 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 432 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 372 KB Output is correct
14 Correct 12 ms 348 KB Output is correct
15 Correct 12 ms 344 KB Output is correct
16 Correct 12 ms 468 KB Output is correct
17 Correct 11 ms 472 KB Output is correct
18 Correct 8 ms 348 KB Output is correct
19 Correct 8 ms 348 KB Output is correct
20 Correct 8 ms 468 KB Output is correct
21 Correct 8 ms 348 KB Output is correct
22 Correct 9 ms 348 KB Output is correct
23 Correct 7 ms 348 KB Output is correct
24 Correct 8 ms 348 KB Output is correct
25 Correct 7 ms 460 KB Output is correct
26 Correct 9 ms 344 KB Output is correct
27 Correct 9 ms 344 KB Output is correct
28 Correct 9 ms 348 KB Output is correct
29 Correct 7 ms 348 KB Output is correct
30 Correct 7 ms 348 KB Output is correct
31 Correct 8 ms 348 KB Output is correct
32 Correct 9 ms 348 KB Output is correct
33 Correct 9 ms 472 KB Output is correct

Subtask #3
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 432 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 372 KB Output is correct
14 Correct 12 ms 348 KB Output is correct
15 Correct 12 ms 344 KB Output is correct
16 Correct 12 ms 468 KB Output is correct
17 Correct 11 ms 472 KB Output is correct
18 Correct 8 ms 348 KB Output is correct
19 Correct 8 ms 348 KB Output is correct
20 Correct 8 ms 468 KB Output is correct
21 Correct 8 ms 348 KB Output is correct
22 Correct 9 ms 348 KB Output is correct
23 Correct 7 ms 348 KB Output is correct
24 Correct 8 ms 348 KB Output is correct
25 Correct 7 ms 460 KB Output is correct
26 Correct 9 ms 344 KB Output is correct
27 Correct 9 ms 344 KB Output is correct
28 Correct 9 ms 348 KB Output is correct
29 Correct 7 ms 348 KB Output is correct
30 Correct 7 ms 348 KB Output is correct
31 Correct 8 ms 348 KB Output is correct
32 Correct 9 ms 348 KB Output is correct
33 Correct 9 ms 472 KB Output is correct
34 Incorrect 105 ms 556 KB Output isn't correct
35 Halted 0 ms 0 KB -

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 432 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 372 KB Output is correct
14 Correct 12 ms 348 KB Output is correct
15 Correct 12 ms 344 KB Output is correct
16 Correct 12 ms 468 KB Output is correct
17 Correct 11 ms 472 KB Output is correct
18 Correct 8 ms 348 KB Output is correct
19 Correct 8 ms 348 KB Output is correct
20 Correct 8 ms 468 KB Output is correct
21 Correct 8 ms 348 KB Output is correct
22 Correct 9 ms 348 KB Output is correct
23 Correct 7 ms 348 KB Output is correct
24 Correct 8 ms 348 KB Output is correct
25 Correct 7 ms 460 KB Output is correct
26 Correct 9 ms 344 KB Output is correct
27 Correct 9 ms 344 KB Output is correct
28 Correct 9 ms 348 KB Output is correct
29 Correct 7 ms 348 KB Output is correct
30 Correct 7 ms 348 KB Output is correct
31 Correct 8 ms 348 KB Output is correct
32 Correct 9 ms 348 KB Output is correct
33 Correct 9 ms 472 KB Output is correct
34 Incorrect 105 ms 556 KB Output isn't correct
35 Halted 0 ms 0 KB -