oj.uz

Submission #867118

# Submission time Handle Problem Language Result Execution time Memory
867118 2023-10-27T17:17:04 Z epicci23 Ekoeko (COCI21_ekoeko) C++17
110 / 110
 11 ms 3816 KB 
#include "bits/stdc++.h"
using namespace std;
#define pb push_back
#define endl "\n" 
#define int long long
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()

constexpr int N = 1e5 + 5;
int fw[N];

void upd(int c){
  for(;c<N;c+=c&-c) fw[c]++;
}

int query(int c,int res=0){
  for(;c;c-=c&-c) res+=fw[c];
  return res;
}

vector<int> convert(string a,string b,int n){
  queue<int> q[26];
  for(int i=0;i<n;i++) q[b[i]-'a'].push(i);
  
  vector<int> res;

  for(int i=0;i<n;i++){
    res.pb(q[a[i]-'a'].front()+1);
    q[a[i]-'a'].pop();
  }

  return res;
}

void solve(){
  int n;
  cin >> n;
  string s;
  cin >> s;
  string s1="",s2="";
 
  int cnt[26],cur[26];
  for(int i=0;i<26;i++) cnt[i]=count(all(s),(char)('a'+i)); 
  int ans=0,c2=0;
  memset(cur,0,sizeof(cur));
  for(int i=0;i<2*n;i++){
    cur[s[i]-'a']++;
    if(cur[s[i]-'a']>cnt[s[i]-'a']/2){ 
      c2++;
      s2.pb(s[i]);
    }
    else{ 
      ans+=c2;
      s1.pb(s[i]);
    }
  }

  vector<int> perm = convert(s1,s2,n);
  
  for(int i=0;i<n;i++){
  	ans+=query(n)-query(perm[i]);
  	upd(perm[i]);
  }

  cout << ans << endl;
}

int32_t main(){

  cin.tie(0); ios::sync_with_stdio(0);
  
  int t=1;//cin >> t;
  while(t--) solve();

  return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 3 ms 1500 KB Output is correct
3 Correct 6 ms 2656 KB Output is correct
4 Correct 9 ms 3816 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 3 ms 1500 KB Output is correct
3 Correct 6 ms 2656 KB Output is correct
4 Correct 9 ms 3816 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 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 3 ms 1500 KB Output is correct
3 Correct 6 ms 2656 KB Output is correct
4 Correct 9 ms 3816 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 10 ms 3676 KB Output is correct
7 Correct 9 ms 3680 KB Output is correct
8 Correct 10 ms 3680 KB Output is correct
9 Correct 9 ms 3684 KB Output is correct
10 Correct 9 ms 3680 KB Output is correct
11 Correct 9 ms 3632 KB Output is correct
12 Correct 10 ms 3420 KB Output is correct
13 Correct 9 ms 3576 KB Output is correct
14 Correct 9 ms 3420 KB Output is correct
15 Correct 9 ms 3416 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 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 348 KB Output is correct

Subtask #5
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 3 ms 1500 KB Output is correct
3 Correct 6 ms 2656 KB Output is correct
4 Correct 9 ms 3816 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 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 10 ms 3676 KB Output is correct
11 Correct 9 ms 3680 KB Output is correct
12 Correct 10 ms 3680 KB Output is correct
13 Correct 9 ms 3684 KB Output is correct
14 Correct 9 ms 3680 KB Output is correct
15 Correct 9 ms 3632 KB Output is correct
16 Correct 10 ms 3420 KB Output is correct
17 Correct 9 ms 3576 KB Output is correct
18 Correct 9 ms 3420 KB Output is correct
19 Correct 9 ms 3416 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 11 ms 3812 KB Output is correct
33 Correct 9 ms 3680 KB Output is correct
34 Correct 10 ms 3680 KB Output is correct
35 Correct 10 ms 3684 KB Output is correct
36 Correct 10 ms 3680 KB Output is correct
37 Correct 9 ms 3580 KB Output is correct
38 Correct 9 ms 3420 KB Output is correct
39 Correct 9 ms 3544 KB Output is correct
40 Correct 9 ms 3420 KB Output is correct
41 Correct 9 ms 3384 KB Output is correct