Submission #889817

#	Time	Username	Problem	Language	Result	Execution time	Memory
889817		vjudge1	Chorus (JOI23_chorus)	C++17	0 / 100	0 ms	348 KiB

chorus

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define ff first
#define ss second
#define all(a) a.begin(), a.end()
const int mod = 998244353;
const int N = 1e5;


int ans = INT_MAX;
int n, k;
vector<int> p;
string s;
deque<int> A, B, A1, B1;
vector<int> vec;
void f(int cursum, int last){
	if(p.size() > k or cursum > n) return;
	if(cursum == n){
		if(p.size() == k){
				int res = 0;
				for(int sz : p){
					int x = sz;
					vec.clear();
					while(x--){
						vec.push_back(A.front());
						A.pop_front();
					}
					
					x = sz;
					while(x--){
						int el = B.front();
						B.pop_front();
						for(int el1 : vec){
							if(el1 > el){
								res++;
							}
						}
					}
				}
				A = A1, B = B1;
				ans = min(ans, res);
				return;
		}
		return;
	}
	for(int i = 1;i + cursum <= n; i++){
		p.push_back(i);
		f(cursum + i, i);
		p.pop_back();
	}
}
/*
5 2
AABABABBAB
*/



/*
10 3
ABABBBBABBABABABAAAA
* */

/*
  5 3
AABABABBAB
* */
signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	cin >> n >> k >> s;
	for(int i = 0;i < 2*n; i++){
		if(s[i] == 'A'){
			A.push_back(i);
		}else B.push_back(i);
	}
	A1 = A, B1 = B;
	f(0, 1);
	
	cout << ans;
	
	return 0;
}

Compilation message (stderr)

chorus.cpp: In function 'void f(long long int, long long int)':
chorus.cpp:19:14: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   19 |  if(p.size() > k or cursum > n) return;
      |     ~~~~~~~~~^~~
chorus.cpp:21:15: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   21 |   if(p.size() == k){
      |      ~~~~~~~~~^~~~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 24
• Subtask 3: 0 / 21
• Subtask 4: 0 / 26
• Subtask 5: 0 / 13