oj.uz

Submission #536470

# Submission time Handle Problem Language Result Execution time Memory
536470 2022-03-13T11:41:28 Z Carmel_Ab1 Ekoeko (COCI21_ekoeko) C++17
110 / 110
 79 ms 7760 KB 
#include<bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//using namespace __gnu_pbds;
using namespace std;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int>vi;
typedef vector<vector<int>>vvi;
typedef vector<ll>vl;
typedef vector<vl> vvl;
typedef pair<int,int>pi;
typedef pair<ll,ll> pl;
typedef vector<pl> vpl;
typedef vector<ld> vld;
typedef pair<ld,ld> pld;
typedef vector<pi> vpi;

//typedef tree<ll, null_type, less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
template<typename T> ostream& operator<<(ostream& os, vector<T>& a){os<<"[";for(int i=0; i<ll(a.size()); i++){os << a[i] << ((i!=ll(a.size()-1)?" ":""));}os << "]\n"; return os;}

#define all(x) x.begin(),x.end()
#define YES out("YES")
#define NO out("NO")
#define out(x){cout << x << "\n"; return;}
#define GLHF ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define print(x){for(auto ait:x) cout << ait << " "; cout << "\n";}
#define pb push_back
#define umap unordered_map

template<typename T1, typename T2> istream& operator>>(istream& is, pair<T1, T2>& p){is >> p.first >> p.second;return is;}
template<typename T1, typename T2> ostream& operator<<(ostream& os, pair<T1, T2>& p){os <<"" << p.first << " " << p.second << ""; return os;}
void usaco(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
}
template<typename T>
void read(vector<T>& v){
    int n=v.size();
    for(int i=0; i<n; i++)
        cin >> v[i];
}
template<typename T>
vector<T>UNQ(vector<T>a){
    vector<T>ans;
    for(T t:a)
        if(ans.empty() || t!=ans.back())
            ans.push_back(t);
    return ans;
}
ll ceil(ll a,ll b){
    ll ans=a/b;
    if(a%b)ans++;
    return ans;
}
ld log (ld a,ld b){return log(b)/log(a);}
ll power(ll base, ll exp,ll M=1e18){//(base^exp)%M
    ll ans=1;
    while(exp){
        if(exp%2==1)ans=((ans%M)*(base%M))%M;
        base=((base%M)*(base%M))%M;
        exp/=2;
    }
    return ans;
}

string to_base(int n,int new_base){
    string s;
    int nn=n;
    while(nn){
        s+=to_string(nn%new_base);
        nn/=new_base;
    }
    reverse(all(s));
    return s;
}
ll gcd(ll a,ll b){
    if(a<b)swap(a,b);
    if(b==0)return a;
    return gcd(b,a%b);
}
ll lcm(ll a,ll b){
    ll x= (a/gcd(a,b));
    return b*x;
}
vl generate_array(ll n,ll mn=1,ll mx=1e18+1){
    if(mx==1e18+1)
        mx=n;
    vl ans(n);
    for(int i=0; i<n;i++)
        ans[i]=(mn+rand()%(mx-mn+1));
    return ans;
}
string substr(string s,int l,int r){
    string ans;
    for(int i=l; i<=r; i++)
        ans+=s[i];
    return ans;
}


void solve();
int main(){
    GLHF;
    int t=1;
    //cin >> t;
    while(t--)
        solve();
}

struct seg{
    vl t;
    ll sz=1;
    seg(int n){
        while(sz<=2*n)
            sz*=2;
        t.resize(sz);
    }

    void upd(int i,int v){
        t[i+=sz/2]+=v;
        while(i){
            t[i/2]=t[i]+t[i^1];
            i/=2;
        }
    }

    ll qur(ll l,ll r){
        ll ans=0;
        for(l+=sz/2,r+=sz/2 +1; l<r; l/=2,r/=2){
            if(l&1)ans+=t[l++];
            if(r&1)ans+=t[--r];
        }
        return ans;
    }
};

ll count(string s,string t){
    int n=s.size();
    vi to(n);

    vvi c(26);
    for(int i=0; i<n; i++)
        c[s[i]-'a'].pb(i);

    for(int i=n-1; 0<=i; i--){
        to[c[t[i]-'a'].back()]=i;
        c[t[i]-'a'].pop_back();
    }

    ll ans=0;
    seg ST(n);
    for(int i=0; i<n; i++){
        ans+=ST.qur(to[i]+1,n);
        ST.upd(to[i],1);
    }
    return ans;
}
void solve() {
    int n;
    cin >> n;

    string s;
    cin >> s;

   string s1,s2;


   map<int,int>cnt,cur;
   for(char c:s)
       cnt[c]++;

   for(int i=0; i<2*n; i++){
       cur[s[i]]++;

       if(2*cur[s[i]]<=cnt[s[i]])
           s1+=s[i];
   }

   cur.clear();
   for(int i=2*n-1; 0<=i ;i--){
       cur[s[i]]++;

       if(2*cur[s[i]]<=cnt[s[i]])
           s2+=s[i];
   }

   reverse(all(s2));

    out(min(count(s,s1+s1),count(s,s2+s2)))
}

Compilation message

Main.cpp: In function 'void usaco(std::string)':
Main.cpp:41:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |     freopen(FIN, "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:42:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     freopen(FOUT, "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 18 ms 3608 KB Output is correct
3 Correct 39 ms 6964 KB Output is correct
4 Correct 55 ms 7760 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 18 ms 3608 KB Output is correct
3 Correct 39 ms 6964 KB Output is correct
4 Correct 55 ms 7760 KB Output is correct
5 Correct 0 ms 212 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 18 ms 3608 KB Output is correct
3 Correct 39 ms 6964 KB Output is correct
4 Correct 55 ms 7760 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 77 ms 7236 KB Output is correct
7 Correct 79 ms 7292 KB Output is correct
8 Correct 78 ms 7388 KB Output is correct
9 Correct 79 ms 7260 KB Output is correct
10 Correct 77 ms 7232 KB Output is correct
11 Correct 73 ms 7144 KB Output is correct
12 Correct 72 ms 7408 KB Output is correct
13 Correct 69 ms 7256 KB Output is correct
14 Correct 69 ms 7248 KB Output is correct
15 Correct 75 ms 7172 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 320 KB Output is correct

Subtask #5
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 18 ms 3608 KB Output is correct
3 Correct 39 ms 6964 KB Output is correct
4 Correct 55 ms 7760 KB Output is correct
5 Correct 0 ms 212 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 0 ms 212 KB Output is correct
10 Correct 77 ms 7236 KB Output is correct
11 Correct 79 ms 7292 KB Output is correct
12 Correct 78 ms 7388 KB Output is correct
13 Correct 79 ms 7260 KB Output is correct
14 Correct 77 ms 7232 KB Output is correct
15 Correct 73 ms 7144 KB Output is correct
16 Correct 72 ms 7408 KB Output is correct
17 Correct 69 ms 7256 KB Output is correct
18 Correct 69 ms 7248 KB Output is correct
19 Correct 75 ms 7172 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 320 KB Output is correct
31 Correct 1 ms 212 KB Output is correct
32 Correct 79 ms 7492 KB Output is correct
33 Correct 76 ms 7400 KB Output is correct
34 Correct 74 ms 7472 KB Output is correct
35 Correct 74 ms 7444 KB Output is correct
36 Correct 71 ms 7416 KB Output is correct
37 Correct 72 ms 7404 KB Output is correct
38 Correct 72 ms 7364 KB Output is correct
39 Correct 71 ms 7352 KB Output is correct
40 Correct 70 ms 7336 KB Output is correct
41 Correct 73 ms 7216 KB Output is correct