Submission #623144

# Submission time Handle Problem Language Result Execution time Memory
623144 2022-08-05T08:59:39 Z S2speed Monochrome Points (JOI20_monochrome) C++17
100 / 100
1747 ms 10892 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';
			return 0;
		}
	}
	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;
}
# Verdict Execution time Memory Grader output
1 Correct 1 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 1 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 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 1 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 3 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 3 ms 3412 KB Output is correct
17 Correct 2 ms 3412 KB Output is correct
18 Correct 3 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 2 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 2 ms 3412 KB Output is correct
33 Correct 3 ms 3412 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 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 1 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 3 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 3 ms 3412 KB Output is correct
17 Correct 2 ms 3412 KB Output is correct
18 Correct 3 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 2 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 2 ms 3412 KB Output is correct
33 Correct 3 ms 3412 KB Output is correct
34 Correct 11 ms 3540 KB Output is correct
35 Correct 11 ms 3540 KB Output is correct
36 Correct 11 ms 3556 KB Output is correct
37 Correct 11 ms 3556 KB Output is correct
38 Correct 10 ms 3540 KB Output is correct
39 Correct 11 ms 3540 KB Output is correct
40 Correct 10 ms 3540 KB Output is correct
41 Correct 9 ms 3544 KB Output is correct
42 Correct 11 ms 3540 KB Output is correct
43 Correct 17 ms 3432 KB Output is correct
44 Correct 10 ms 3540 KB Output is correct
45 Correct 15 ms 3544 KB Output is correct
46 Correct 15 ms 3540 KB Output is correct
47 Correct 15 ms 3540 KB Output is correct
48 Correct 11 ms 3540 KB Output is correct
49 Correct 10 ms 3540 KB Output is correct
50 Correct 16 ms 3548 KB Output is correct
51 Correct 15 ms 3540 KB Output is correct
52 Correct 11 ms 3540 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 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 1 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 3 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 3 ms 3412 KB Output is correct
17 Correct 2 ms 3412 KB Output is correct
18 Correct 3 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 2 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 2 ms 3412 KB Output is correct
33 Correct 3 ms 3412 KB Output is correct
34 Correct 11 ms 3540 KB Output is correct
35 Correct 11 ms 3540 KB Output is correct
36 Correct 11 ms 3556 KB Output is correct
37 Correct 11 ms 3556 KB Output is correct
38 Correct 10 ms 3540 KB Output is correct
39 Correct 11 ms 3540 KB Output is correct
40 Correct 10 ms 3540 KB Output is correct
41 Correct 9 ms 3544 KB Output is correct
42 Correct 11 ms 3540 KB Output is correct
43 Correct 17 ms 3432 KB Output is correct
44 Correct 10 ms 3540 KB Output is correct
45 Correct 15 ms 3544 KB Output is correct
46 Correct 15 ms 3540 KB Output is correct
47 Correct 15 ms 3540 KB Output is correct
48 Correct 11 ms 3540 KB Output is correct
49 Correct 10 ms 3540 KB Output is correct
50 Correct 16 ms 3548 KB Output is correct
51 Correct 15 ms 3540 KB Output is correct
52 Correct 11 ms 3540 KB Output is correct
53 Correct 1281 ms 10608 KB Output is correct
54 Correct 1275 ms 10884 KB Output is correct
55 Correct 1194 ms 10580 KB Output is correct
56 Correct 1215 ms 10620 KB Output is correct
57 Correct 1235 ms 10332 KB Output is correct
58 Correct 1273 ms 10632 KB Output is correct
59 Correct 1217 ms 10588 KB Output is correct
60 Correct 1224 ms 10392 KB Output is correct
61 Correct 1241 ms 10448 KB Output is correct
62 Correct 1238 ms 10464 KB Output is correct
63 Correct 1233 ms 10580 KB Output is correct
64 Correct 1229 ms 10344 KB Output is correct
65 Correct 1153 ms 10052 KB Output is correct
66 Correct 1202 ms 10268 KB Output is correct
67 Correct 1228 ms 10284 KB Output is correct
68 Correct 1128 ms 9960 KB Output is correct
69 Correct 1288 ms 10584 KB Output is correct
70 Correct 1148 ms 9992 KB Output is correct
71 Correct 1747 ms 10708 KB Output is correct
72 Correct 1733 ms 10636 KB Output is correct
73 Correct 1298 ms 10892 KB Output is correct