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답안 #1033050

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1033050 2024-07-24T12:21:51 Z Unforgettablepl Chorus (JOI23_chorus) C++17
100 / 100
 5419 ms 63100 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
 
const int INF = 1e13;
 
struct fenwick{
	vector<int> tree;
	int n;
	fenwick(int n):n(n),tree(n+1){}
	void add(int k,int x){
		while(k<=n){
			tree[k]+=x;
			k+=k&-k;
		}
	}
	int get(int k){
		int ans = 0;
		while(k){
			ans+=tree[k];
			k-=k&-k;
		}
		return ans;
	}
};
 
int32_t main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	int n,k;
	cin >> n >> k;
	string s;
	cin >> s;
	s.insert(s.begin(),'$');
	vector<int> posA(n+1);
	vector<int> posB(n+1);
	int cntA = 0,cntB = 0;
	for(int i=1;i<=2*n;i++){
		if(s[i]=='A'){
			posA[++cntA]=i;
		} else {
			posB[++cntB]=i;
		}
	}
	vector<int> costA(n+1);
	vector<int> costB(n+1);
	vector<int> lastB(n+1);
	{
		fenwick temp(2*n);
		for(int i=n;i;i--){
			temp.add(posB[i],1);
			costA[i] = temp.get(posA[i]);
		}
		for(int i=1;i<=n;i++)costA[i]+=costA[i-1];
	}
	{
		fenwick temp(2*n);
		for(int i=n;i;i--){
			costB[i] = n-i-temp.get(posB[i]);
			temp.add(posA[i],1);
		}
		for(int i=1;i<=n;i++)costB[i]+=costB[i-1];
	}
	{
		int currlast = 0;
		for(int i=1;i<=n;i++){
			while(currlast!=n and posB[currlast+1]<posA[i])currlast++;
			lastB[i] = min(currlast,i);
		}
	}
	auto solve = [&](int penalty){
		vector<pair<int,int>> DP(n+1,{INF,INF});
		DP[0]={0,0};
		auto cost = [&](int a,int b){
			assert(a<=b);
			int Ac = costA[b]-costA[a-1];
			if(lastB[b]<a)return Ac+penalty;
			int amt = lastB[b]-a+1;;
			int Bc = costB[lastB[b]]-costB[a-1]-amt*(n-b);
			return Ac+Bc+penalty;
		};
		deque<pair<int,int>> q;
		auto test = [&](int x,int a,int b){
			// Will return true if a is better for x than b
			return make_pair(DP[a-1].first+cost(a,x),DP[a-1].second+1)<make_pair(DP[b-1].first+cost(b,x),DP[b-1].second+1);
		};
		for(int i=1;i<=n;i++){
			// Add i
			while(!q.empty() and q.front().second<i)q.pop_front();
			while(!q.empty()){
				int lower = i;
				if(q.size()>1)lower = q[q.size()-2].second+1;
				if(test(lower,i,q.back().first)){
					q.pop_back();
					continue;
				}
				for(int jump=524288;jump;jump/=2)if(lower+jump<=n and test(lower+jump,q.back().first,i))lower+=jump;
				q.back().second = lower;
				break;
			}
			if(q.empty() or q.back().second!=n)q.emplace_back(i,n);
			// Query i
			assert(!q.empty());
			DP[i] = {DP[q.front().first-1].first+cost(q.front().first,i),DP[q.front().first-1].second+1};
		}
		return DP[n];
	};
	int best_penalty = -1;
	for(int jump=(1ll<<40);jump;jump/=2ll){
		if(solve(best_penalty+jump).second>k)best_penalty+=jump;
	}
	best_penalty++;
	cout << solve(best_penalty).first-k*best_penalty << '\n';
}

Compilation message

chorus.cpp: In constructor 'fenwick::fenwick(long long int)':
chorus.cpp:10:6: warning: 'fenwick::n' will be initialized after [-Wreorder]
   10 |  int n;
      |      ^
chorus.cpp:9:14: warning:   'std::vector<long long int> fenwick::tree' [-Wreorder]
    9 |  vector<int> tree;
      |              ^~~~
chorus.cpp:11:2: warning:   when initialized here [-Wreorder]
   11 |  fenwick(int n):n(n),tree(n+1){}
      |  ^~~~~~~

Subtask #1
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 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 0 ms 456 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 448 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 344 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 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 0 ms 456 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 448 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 452 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 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 0 ms 456 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 448 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 452 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 15 ms 768 KB Output is correct
30 Correct 15 ms 772 KB Output is correct
31 Correct 14 ms 600 KB Output is correct
32 Correct 12 ms 604 KB Output is correct
33 Correct 14 ms 784 KB Output is correct
34 Correct 13 ms 604 KB Output is correct
35 Correct 12 ms 760 KB Output is correct
36 Correct 15 ms 604 KB Output is correct
37 Correct 15 ms 780 KB Output is correct
38 Correct 12 ms 604 KB Output is correct
39 Correct 15 ms 604 KB Output is correct
40 Correct 13 ms 720 KB Output is correct
41 Correct 12 ms 600 KB Output is correct
42 Correct 12 ms 604 KB Output is correct

Subtask #4
26.0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 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 0 ms 456 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 448 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 452 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 15 ms 768 KB Output is correct
30 Correct 15 ms 772 KB Output is correct
31 Correct 14 ms 600 KB Output is correct
32 Correct 12 ms 604 KB Output is correct
33 Correct 14 ms 784 KB Output is correct
34 Correct 13 ms 604 KB Output is correct
35 Correct 12 ms 760 KB Output is correct
36 Correct 15 ms 604 KB Output is correct
37 Correct 15 ms 780 KB Output is correct
38 Correct 12 ms 604 KB Output is correct
39 Correct 15 ms 604 KB Output is correct
40 Correct 13 ms 720 KB Output is correct
41 Correct 12 ms 600 KB Output is correct
42 Correct 12 ms 604 KB Output is correct
43 Correct 209 ms 4016 KB Output is correct
44 Correct 367 ms 6604 KB Output is correct
45 Correct 380 ms 6588 KB Output is correct
46 Correct 326 ms 6376 KB Output is correct
47 Correct 297 ms 6608 KB Output is correct
48 Correct 356 ms 6584 KB Output is correct
49 Correct 393 ms 6592 KB Output is correct
50 Correct 362 ms 6684 KB Output is correct
51 Correct 371 ms 6592 KB Output is correct
52 Correct 346 ms 6588 KB Output is correct
53 Correct 361 ms 6588 KB Output is correct
54 Correct 444 ms 6848 KB Output is correct

Subtask #5
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 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 0 ms 456 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 448 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 452 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 15 ms 768 KB Output is correct
30 Correct 15 ms 772 KB Output is correct
31 Correct 14 ms 600 KB Output is correct
32 Correct 12 ms 604 KB Output is correct
33 Correct 14 ms 784 KB Output is correct
34 Correct 13 ms 604 KB Output is correct
35 Correct 12 ms 760 KB Output is correct
36 Correct 15 ms 604 KB Output is correct
37 Correct 15 ms 780 KB Output is correct
38 Correct 12 ms 604 KB Output is correct
39 Correct 15 ms 604 KB Output is correct
40 Correct 13 ms 720 KB Output is correct
41 Correct 12 ms 600 KB Output is correct
42 Correct 12 ms 604 KB Output is correct
43 Correct 209 ms 4016 KB Output is correct
44 Correct 367 ms 6604 KB Output is correct
45 Correct 380 ms 6588 KB Output is correct
46 Correct 326 ms 6376 KB Output is correct
47 Correct 297 ms 6608 KB Output is correct
48 Correct 356 ms 6584 KB Output is correct
49 Correct 393 ms 6592 KB Output is correct
50 Correct 362 ms 6684 KB Output is correct
51 Correct 371 ms 6592 KB Output is correct
52 Correct 346 ms 6588 KB Output is correct
53 Correct 361 ms 6588 KB Output is correct
54 Correct 444 ms 6848 KB Output is correct
55 Correct 2831 ms 40300 KB Output is correct
56 Correct 4676 ms 62856 KB Output is correct
57 Correct 4490 ms 62760 KB Output is correct
58 Correct 3436 ms 61220 KB Output is correct
59 Correct 3457 ms 63016 KB Output is correct
60 Correct 4671 ms 62980 KB Output is correct
61 Correct 4541 ms 62980 KB Output is correct
62 Correct 4571 ms 62588 KB Output is correct
63 Correct 5084 ms 62760 KB Output is correct
64 Correct 4937 ms 63016 KB Output is correct
65 Correct 5077 ms 63020 KB Output is correct
66 Correct 5419 ms 62844 KB Output is correct
67 Correct 4848 ms 63100 KB Output is correct