oj.uz

Submission #709723

# Submission time Handle Problem Language Result Execution time Memory
709723 2023-03-14T09:03:24 Z Antekb Monochrome Points (JOI20_monochrome) C++17
100 / 100
 1367 ms 9436 KB 
#include<bits/stdc++.h>

#define st first
#define nd second
#define eb emplace_back
#define pb push_back
#define mp make_pair
#define pp pop_back
#define all(x) x.begin(), x.end()

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

void debug(){cerr<<"\n";}
template<typename H, typename... T>
void debug(H h, T... t){cerr<<h;if(sizeof...(t))cerr<<", ";debug(t...);};
#define deb(x...) cerr<<#x<<" = ";debug(x);

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

const int N=1<<19, INF=1e9+5;
int tab[N+N];
void add(int v, int c){
	for(v+=N; v; v>>=1)tab[v]+=c;
}
int sum(int l, int r){
	int ans=0;
	for(l+=N,r+=N; l<r; l>>=1, r>>=1){
		if(l&1)ans+=tab[l++];
		if(r&1)ans+=tab[--r];
	}
	return ans;
}
vi A, B;
int n;
ll solve(int a){
	int wsk=n, wsk2=n;
	vector<pii> V(n);
	for(int i=0; i<a; i++){
		//deb(wsk, wsk2);
		V[i]=mp(A[i], B[n-a+i]);
	}
	for(int i=a; i<n; i++){
		V[i]=mp(A[i], B[i-a]);
	}
	for(pii &i:V)if(i.st>i.nd)swap(i.st, i.nd);
	sort(all(V));
	ll ans=0;
	for(int i=0; i<n; i++){
		//deb(V[i]);
		//deb(V[i].st, V[i].nd);
		ans+=sum(V[i].st, V[i].nd);
		add(V[i].nd, 1);
	}
	for(int i=0; i<n; i++){
		add(V[i].nd, -1);
	}
	//deb(ans);
	return ans;
}
ll res[N];
ll ans;
ll getans(int t){
	t%=n;
	if(res[t]==-1)res[t]=solve(t);
	ans=max(ans, res[t]);
	return res[t];
}
int main(){
	//ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n;
	string s;
	cin>>s;
	for(int i=0; i<n+n; i++){
		if(s[i]=='B')A.pb(i);
		else B.pb(i);
	}
	for(int i=0; i<n; i++){
		res[i]=-1ll;
		//deb(getans(i));
	}
	if(n<=10){
		for(int i=0;i<n; i++)getans(i);
	}
	else{
		int k=n/8;
		for(int i=0; ;i+=k){
			if(getans(i)<=getans(i+1) && getans(i+k)>getans(i+k+1)){
				int l=i+1, r=i+k;
				while(l<r){
					int m=(l+r)>>1;
					if(getans(m)<=getans(m+1))l=m+1;
					else r=m;
				}
				getans(r);
				break;
			}
		}
	}
	cout<<ans;
}

Compilation message

monochrome.cpp: In function 'll solve(int)':
monochrome.cpp:40:6: warning: unused variable 'wsk' [-Wunused-variable]
   40 |  int wsk=n, wsk2=n;
      |      ^~~
monochrome.cpp:40:13: warning: unused variable 'wsk2' [-Wunused-variable]
   40 |  int wsk=n, wsk2=n;
      |             ^~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 2 ms 340 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 2 ms 340 KB Output is correct
34 Correct 7 ms 340 KB Output is correct
35 Correct 7 ms 340 KB Output is correct
36 Correct 8 ms 340 KB Output is correct
37 Correct 7 ms 340 KB Output is correct
38 Correct 6 ms 464 KB Output is correct
39 Correct 6 ms 340 KB Output is correct
40 Correct 6 ms 444 KB Output is correct
41 Correct 6 ms 340 KB Output is correct
42 Correct 7 ms 340 KB Output is correct
43 Correct 5 ms 340 KB Output is correct
44 Correct 6 ms 340 KB Output is correct
45 Correct 7 ms 448 KB Output is correct
46 Correct 7 ms 340 KB Output is correct
47 Correct 5 ms 340 KB Output is correct
48 Correct 6 ms 340 KB Output is correct
49 Correct 5 ms 340 KB Output is correct
50 Correct 6 ms 340 KB Output is correct
51 Correct 7 ms 440 KB Output is correct
52 Correct 6 ms 340 KB Output is correct

Subtask #4
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 2 ms 340 KB Output is correct
34 Correct 7 ms 340 KB Output is correct
35 Correct 7 ms 340 KB Output is correct
36 Correct 8 ms 340 KB Output is correct
37 Correct 7 ms 340 KB Output is correct
38 Correct 6 ms 464 KB Output is correct
39 Correct 6 ms 340 KB Output is correct
40 Correct 6 ms 444 KB Output is correct
41 Correct 6 ms 340 KB Output is correct
42 Correct 7 ms 340 KB Output is correct
43 Correct 5 ms 340 KB Output is correct
44 Correct 6 ms 340 KB Output is correct
45 Correct 7 ms 448 KB Output is correct
46 Correct 7 ms 340 KB Output is correct
47 Correct 5 ms 340 KB Output is correct
48 Correct 6 ms 340 KB Output is correct
49 Correct 5 ms 340 KB Output is correct
50 Correct 6 ms 340 KB Output is correct
51 Correct 7 ms 440 KB Output is correct
52 Correct 6 ms 340 KB Output is correct
53 Correct 1338 ms 8916 KB Output is correct
54 Correct 1367 ms 9436 KB Output is correct
55 Correct 1220 ms 8844 KB Output is correct
56 Correct 1224 ms 8888 KB Output is correct
57 Correct 843 ms 8060 KB Output is correct
58 Correct 940 ms 8672 KB Output is correct
59 Correct 958 ms 8344 KB Output is correct
60 Correct 960 ms 8936 KB Output is correct
61 Correct 1078 ms 9056 KB Output is correct
62 Correct 1080 ms 9052 KB Output is correct
63 Correct 1137 ms 8964 KB Output is correct
64 Correct 1026 ms 8164 KB Output is correct
65 Correct 1100 ms 8576 KB Output is correct
66 Correct 1055 ms 8544 KB Output is correct
67 Correct 1058 ms 8636 KB Output is correct
68 Correct 824 ms 8156 KB Output is correct
69 Correct 865 ms 8328 KB Output is correct
70 Correct 849 ms 7232 KB Output is correct
71 Correct 845 ms 7524 KB Output is correct
72 Correct 1137 ms 7520 KB Output is correct
73 Correct 1172 ms 9268 KB Output is correct