oj.uz

Submission #623143

# Submission time Handle Problem Language Result Execution time Memory
623143 2022-08-05T08:58:46 Z S2speed Monochrome Points (JOI20_monochrome) C++17
25 / 100
 20 ms 3540 KB 
#include<bits/stdc++.h>

using namespace std;

#pragma GCC optimize ("Ofast")

typedef long long ll;
typedef pair<ll , ll> pll;

const ll maxn = 4e5 + 17;

ll n;
string s;
vector<ll> a , b;
ll ps[maxn] , c[maxn];

ll cal(ll k){
	if(c[k] != -1) return c[k];
	ll cur = 0;
	for(ll t = 0 ; t < n ; t++){
		ll i = a[t] , j = b[(t + k) % n];
		if(i < j){
			ll h1 = ps[j] - ps[i] , h0 = j - i - 1 - h1 , b0 = n - 1 - h0 , h = max(0ll , h1 - b0);
			cur += j - i - 1 - (h << 1);
		} else {
			ll d = (n << 1) - (i - j + 1) , h1 = n - ps[i] + ps[j] , h0 = d - h1 , b0 = n - 1 - h0 , h = max(0ll , h1 - b0);
			cur += d - (h << 1);
		}
	}
	cur >>= 1;
	return c[k] = cur;
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	memset(c , -1 , sizeof(c));
	cin>>n>>s;
    for(ll i = 0 ; i < (n << 1) ; i++){
		if(s[i] == 'B'){
			a.push_back(i);
		} else {
			b.push_back(i);
		}
	}
	ps[0] = (s[0] == 'B');
	for(ll i = 1 ; i < (n << 1) ; i++){
		ps[i] = ps[i - 1] + (s[i] == 'B');
	}
	ll sq = 500;
	ll res = 0;
	for(ll i = 0 ; i < n ; i += sq){
		c[i] = cal(i);
		res = max(res , c[i]);
	}
	bool f = false;
	for(ll i = sq ; i < n ; i += sq){
		f |= (c[i - sq] < c[i]);
		if(c[i - sq] >= c[i] && f){
			for(ll j = max(0ll , i - (sq << 1)) ; j <= i ; j++){
				res = max(res , cal(j));
			}
			cout<<res<<'\n';
		}
	}
	for(ll i = max(0ll , n - (sq << 1)) ; i < n ; i++){
		res = max(res , cal(i));
	}
	for(ll i = 0 ; i < sq ; i++){
		res = max(res , cal(i));
	}
	cout<<res<<'\n';
	return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 1 ms 3412 KB Output is correct
3 Correct 1 ms 3412 KB Output is correct
4 Correct 2 ms 3412 KB Output is correct
5 Correct 2 ms 3412 KB Output is correct
6 Correct 1 ms 3412 KB Output is correct
7 Correct 1 ms 3412 KB Output is correct
8 Correct 1 ms 3412 KB Output is correct
9 Correct 1 ms 3412 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 1 ms 3412 KB Output is correct
3 Correct 1 ms 3412 KB Output is correct
4 Correct 2 ms 3412 KB Output is correct
5 Correct 2 ms 3412 KB Output is correct
6 Correct 1 ms 3412 KB Output is correct
7 Correct 1 ms 3412 KB Output is correct
8 Correct 1 ms 3412 KB Output is correct
9 Correct 1 ms 3412 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
14 Correct 2 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 2 ms 3412 KB Output is correct
17 Correct 2 ms 3412 KB Output is correct
18 Correct 2 ms 3412 KB Output is correct
19 Correct 2 ms 3412 KB Output is correct
20 Correct 2 ms 3412 KB Output is correct
21 Correct 2 ms 3412 KB Output is correct
22 Correct 2 ms 3412 KB Output is correct
23 Correct 2 ms 3412 KB Output is correct
24 Correct 3 ms 3412 KB Output is correct
25 Correct 2 ms 3412 KB Output is correct
26 Correct 2 ms 3412 KB Output is correct
27 Correct 2 ms 3412 KB Output is correct
28 Correct 2 ms 3412 KB Output is correct
29 Correct 2 ms 3412 KB Output is correct
30 Correct 2 ms 3412 KB Output is correct
31 Correct 2 ms 3412 KB Output is correct
32 Correct 3 ms 3412 KB Output is correct
33 Correct 2 ms 3412 KB Output is correct

Subtask #3
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 1 ms 3412 KB Output is correct
3 Correct 1 ms 3412 KB Output is correct
4 Correct 2 ms 3412 KB Output is correct
5 Correct 2 ms 3412 KB Output is correct
6 Correct 1 ms 3412 KB Output is correct
7 Correct 1 ms 3412 KB Output is correct
8 Correct 1 ms 3412 KB Output is correct
9 Correct 1 ms 3412 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
14 Correct 2 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 2 ms 3412 KB Output is correct
17 Correct 2 ms 3412 KB Output is correct
18 Correct 2 ms 3412 KB Output is correct
19 Correct 2 ms 3412 KB Output is correct
20 Correct 2 ms 3412 KB Output is correct
21 Correct 2 ms 3412 KB Output is correct
22 Correct 2 ms 3412 KB Output is correct
23 Correct 2 ms 3412 KB Output is correct
24 Correct 3 ms 3412 KB Output is correct
25 Correct 2 ms 3412 KB Output is correct
26 Correct 2 ms 3412 KB Output is correct
27 Correct 2 ms 3412 KB Output is correct
28 Correct 2 ms 3412 KB Output is correct
29 Correct 2 ms 3412 KB Output is correct
30 Correct 2 ms 3412 KB Output is correct
31 Correct 2 ms 3412 KB Output is correct
32 Correct 3 ms 3412 KB Output is correct
33 Correct 2 ms 3412 KB Output is correct
34 Incorrect 20 ms 3540 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 2 ms 3412 KB Output is correct
2 Correct 1 ms 3412 KB Output is correct
3 Correct 1 ms 3412 KB Output is correct
4 Correct 2 ms 3412 KB Output is correct
5 Correct 2 ms 3412 KB Output is correct
6 Correct 1 ms 3412 KB Output is correct
7 Correct 1 ms 3412 KB Output is correct
8 Correct 1 ms 3412 KB Output is correct
9 Correct 1 ms 3412 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
14 Correct 2 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 2 ms 3412 KB Output is correct
17 Correct 2 ms 3412 KB Output is correct
18 Correct 2 ms 3412 KB Output is correct
19 Correct 2 ms 3412 KB Output is correct
20 Correct 2 ms 3412 KB Output is correct
21 Correct 2 ms 3412 KB Output is correct
22 Correct 2 ms 3412 KB Output is correct
23 Correct 2 ms 3412 KB Output is correct
24 Correct 3 ms 3412 KB Output is correct
25 Correct 2 ms 3412 KB Output is correct
26 Correct 2 ms 3412 KB Output is correct
27 Correct 2 ms 3412 KB Output is correct
28 Correct 2 ms 3412 KB Output is correct
29 Correct 2 ms 3412 KB Output is correct
30 Correct 2 ms 3412 KB Output is correct
31 Correct 2 ms 3412 KB Output is correct
32 Correct 3 ms 3412 KB Output is correct
33 Correct 2 ms 3412 KB Output is correct
34 Incorrect 20 ms 3540 KB Output isn't correct
35 Halted 0 ms 0 KB -