oj.uz

Submission #536430

# Submission time Handle Problem Language Result Execution time Memory
536430 2022-03-13T09:51:11 Z inksamurai Ekoeko (COCI21_ekoeko) C++17
50 / 110
 17 ms 4952 KB 
#include <bits/stdc++.h>
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define rng(i,x,n) for(int i=x;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3HspL4A ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using pii=pair<int,int>;
using vi=vec(int);
void print(){cout<<"\n";}
template<class T,class...E>
void print(const T&v,const E&...u){cout<<v<<' ',print(u...);}
// e

struct fenwick{
	int n;
	vector <int> bit;
	fenwick(int m){
		init(m);
	}
	void init(int m){
		n=m;
		bit.resize(n,0);
	}
	int get(int i){
		int s=0;
		while(i){
			s+=bit[i];
			i-=i&-i;
		}
		return s;
	}
	void add(int i,int x){
		while(i<=n){
			bit[i]+=x;
			i+=i&-i;
		}
	}
};

signed main(){
_3HspL4A;
	int n;
	cin>>n;
	string s;
	cin>>s;
	const int m=2*n;
	vec(vi) ids(26);
	rep(i,m){
		ids[s[i]-'a'].pb(i);
	}
	vi cnt(26);
	rep(i,26){
		for(auto j:ids[i]){
			if(j<=n-1) cnt[i]+=1;
			else cnt[i]-=1;
		}
	}
	vi ndl,ndr;
	rep(i,26){
		if(cnt[i]>0){
			assert(cnt[i]%2==0);
			rep(j,cnt[i]/2){
				ndl.pb(ids[i][sz(ids[i])-j-1]);
			}
		}else if(cnt[i]<0){
			assert(abs(cnt[i])%2==0);
			rep(j,abs(cnt[i]/2)){
				ndr.pb(ids[i][j]);
			}
		}
	}
	sort(ndl.begin(),ndl.end());
	sort(ndr.begin(),ndr.end());
	int ans=0;
	string sl="",sr="",adl="",adr="";
	{
		vi usd(m,0);
		for(auto v:ndl) usd[v]=1;
		for(auto v:ndr) usd[v]=1;
		int r=n-1;
		rep(i,n){
			if(!usd[i]){
				sl+=s[i];
			}else{
				ans+=r-i;
				r-=1;
				adl+=s[i];
			}
		}
		int l=n;
		rng(i,n,m){
			if(!usd[i]){
				sr+=s[i];
			}else{
				ans+=i-l;
				l+=1;
				adr+=s[i];
			}
		}
		ans+=sz(adr)*sz(adr);
	}
	sl+=adr;
	sr=adl+sr;
	rep(i,26){
		ids[i].clear();
	}
	rep(i,n){
		ids[sr[i]-'a'].pb(i);
	}
	rep(i,26){
		reverse(ids[i].begin(),ids[i].end());
	}
	fenwick bit(n+11);
	rep(i,n){
		int ch=sl[i]-'a';
		assert(sz(ids[ch]));
		int j=ids[ch].back();
		ans+=j+bit.get(j+1)-i;
		bit.add(1,1);
		bit.add(j+2,-1);
		ids[ch].pop_back();
	}
	print(ans);
//	
	return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 6 ms 2000 KB Output is correct
3 Correct 10 ms 3544 KB Output is correct
4 Correct 17 ms 4952 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 6 ms 2000 KB Output is correct
3 Correct 10 ms 3544 KB Output is correct
4 Correct 17 ms 4952 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 6 ms 2000 KB Output is correct
3 Correct 10 ms 3544 KB Output is correct
4 Correct 17 ms 4952 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 14 ms 4320 KB Output is correct
7 Correct 14 ms 4264 KB Output is correct
8 Correct 13 ms 4328 KB Output is correct
9 Correct 13 ms 4320 KB Output is correct
10 Correct 13 ms 4172 KB Output is correct
11 Correct 13 ms 4324 KB Output is correct
12 Correct 12 ms 4168 KB Output is correct
13 Correct 12 ms 4192 KB Output is correct
14 Correct 12 ms 4064 KB Output is correct
15 Correct 13 ms 4164 KB Output is correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Runtime error 1 ms 596 KB Execution killed with signal 6
3 Halted 0 ms 0 KB -

Subtask #5
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 6 ms 2000 KB Output is correct
3 Correct 10 ms 3544 KB Output is correct
4 Correct 17 ms 4952 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 14 ms 4320 KB Output is correct
11 Correct 14 ms 4264 KB Output is correct
12 Correct 13 ms 4328 KB Output is correct
13 Correct 13 ms 4320 KB Output is correct
14 Correct 13 ms 4172 KB Output is correct
15 Correct 13 ms 4324 KB Output is correct
16 Correct 12 ms 4168 KB Output is correct
17 Correct 12 ms 4192 KB Output is correct
18 Correct 12 ms 4064 KB Output is correct
19 Correct 13 ms 4164 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Runtime error 1 ms 596 KB Execution killed with signal 6
22 Halted 0 ms 0 KB -