Submission #1213723

#	Time	Username	Problem	Language	Result	Execution time	Memory
1213723		thelegendary08	Chorus (JOI23_chorus)	C++17	16 / 100	7093 ms	4344 KiB

chorus

#include<bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define int long long
#define vi vector<int>
#define vvi vector<vector<int>>
#define pii pair<int, int>
#define vpii vector<pair<int, int>>
#define vc vector<char>
#define vb vector<bool>
#define mii map<int,int>
#define f0r(i,n) for(int i=0;i<n;i++)
#define FOR(i,k,n) for(int i=k;i<n;i++)
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define in(a) int a; cin>>a
#define in2(a,b) int a,b; cin>>a>>b
#define in3(a,b,c) int a,b,c; cin>>a>>b>>c
#define in4(a,b,c,d) int a,b,c,d; cin>>a>>b>>c>>d
#define vin(v,n); vi v(n); f0r(i,n){cin>>v[i];}
#define out(a) cout<<a<<'\n'
#define out2(a,b) cout<<a<<' '<<b<<'\n'
#define out3(a,b,c) cout<<a<<' '<<b<<' '<<c<<'\n'
#define out4(a,b,c,d) cout<<a<<' '<<b<<' '<<c<<' '<<d<<'\n'
#define pout(a) cout<<a.first<<' '<<a.second<<'\n'
#define vout(v) for(auto u : v){cout<<u<<' ';} cout<<'\n'
#define dout(a) cout<<a<<' '<<#a<<'\n'
#define dout2(a,b) cout<<a<<' '<<#a<<' '<<b<<' '<<#b<<'\n'
#define yn(x); if(x){cout<<"YES"<<'\n';}else{cout<<"NO"<<'\n';}
const int leg = 1e9 + 7;
const int mod = 998244353;
using namespace std;
 
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	//ifstream cin(".in");
	//ofstream cout(".out");
	in2(N,k);
	string see; cin>>see;
	vi v;
	f0r(i, 2*N){
		if(see[i] == 'A')v.pb(1);
		else v.pb(-1);
	}
	int bad = -1;
	int cur = 0;
	f0r(i, 2 * N){
		cur += v[i]; 
		if(cur < 0){
			bad = i; break;
		}
	}
	int phaseone = 0;
	while(bad != -1){
		int nxt;
		for(int i = bad + 1; i < 2*N; i++){
			if(v[i] == 1){
				nxt = i;
				break;
			}
		}
		for(int i = nxt; i>bad; i--){
			phaseone++;
			swap(v[i], v[i-1]);
		}
		
		int cur = 0;
		bad = -1;
		f0r(i, 2 * N){
			cur += v[i]; 
			if(cur < 0){
				bad = i; break;
			}
		}
		// dout(phaseone);
	}
	
	string se = "";
	f0r(i, 2 * N){
		if(v[i] == 1)se += 'A';
		else se += 'B';
	}	
	vi ass;
	f0r(i, 2 * N){
		if(se[i] == 'A')ass.pb(i);
	}
	// out(se);
	// vout(v);
	// out(phaseone);
	vi perm;
	f0r(i, N){
		perm.pb(-1);
	}
	f0r(i, N){
		perm.pb(1);
	}
	
	set<vi>s;
	do{
		int cur = 0;
		bool ok = 1;
		f0r(i, N*2){
			cur = cur + perm[i];
			if(cur < 0)ok = 0;
		}
		if(ok){
			s.insert(perm);
		}
	}while(next_permutation(perm.begin(), perm.end()));
	
	int anss = 4e18;
	for(auto v : s){
		vi as; vi bs;
		f0r(i, 2 * N){
			if(v[i] == 1)as.pb(i);
			else bs.pb(i);
		}
		
		int ans = 0;
		int fb = bs[0];
		f0r(i, N){
			if(as[i] > fb){
				fb = bs[i];
				ans++;
			}
		}
		ans++;
		if(ans <= k){
			int cur = 0;
			f0r(i, N){
				cur += abs(ass[i] - as[i]);
			}
			anss = min(anss, cur);
		}
	}
	out(anss + phaseone);
}

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