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Submission #528893

# Submission time Handle Problem Language Result Execution time Memory
528893 2022-02-21T17:20:16 Z Rafi22 Ekoeko (COCI21_ekoeko) C++14
110 / 110
 11 ms 3648 KB 
#include <bits/stdc++.h>

using namespace std;

#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define ll long long
ll mod=1000000007;
int inf=1000000007;
ll infl=1000000000000000007;

const int N=200007;

vector<int>V[200];
int side[N];
int p[N];

int BIT[N];
int que(int x) {
	int s=0;
	for (;x;x-=x&-x) s+=BIT[x];
	return s;
}
void ins(int x,int s) {
	for (;x<=200000;x+=x&-x) BIT[x]+=s;
}


int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin>>n;
    string s;
    cin>>s;
    s='#'+s;
    for(int i=1;i<=2*n;i++) V[s[i]].pb(i);
    for(int i='a';i<='z';i++)
    {
        for(int j=0;j<sz(V[i])/2;j++) side[V[i][j]]=1;
        for(int j=sz(V[i])/2;j<sz(V[i]);j++) side[V[i][j]]=2;
    }
    ll ans=0,cnt=0;
    for(int i=1;i<=2*n;i++)
    {
        if(side[i]==2)
        {
            cnt++;
            p[i]=cnt;
        }
        else ans+=cnt;
    }
    for(int i='a';i<='z';i++)
    {
        for(int j=0;j<sz(V[i])/2;j++) p[V[i][j]]=p[V[i][j+sz(V[i])/2]];
    }
    for(int i=1;i<=2*n;i++)
    {
        if(side[i]==2) continue;
        ans+=(ll)que(n)-que(p[i]);
        ins(p[i],1);
    }
    cout<<ans;



    return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:43:35: warning: array subscript has type 'char' [-Wchar-subscripts]
   43 |     for(int i=1;i<=2*n;i++) V[s[i]].pb(i);
      |                                   ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 3 ms 1480 KB Output is correct
3 Correct 5 ms 2516 KB Output is correct
4 Correct 7 ms 3604 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 3 ms 1480 KB Output is correct
3 Correct 5 ms 2516 KB Output is correct
4 Correct 7 ms 3604 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 3 ms 1480 KB Output is correct
3 Correct 5 ms 2516 KB Output is correct
4 Correct 7 ms 3604 KB Output is correct
5 Correct 1 ms 328 KB Output is correct
6 Correct 8 ms 3572 KB Output is correct
7 Correct 8 ms 3568 KB Output is correct
8 Correct 9 ms 3648 KB Output is correct
9 Correct 11 ms 3620 KB Output is correct
10 Correct 9 ms 3484 KB Output is correct
11 Correct 8 ms 3492 KB Output is correct
12 Correct 8 ms 3484 KB Output is correct
13 Correct 7 ms 3488 KB Output is correct
14 Correct 7 ms 3360 KB Output is correct
15 Correct 7 ms 3364 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 1 ms 324 KB Output is correct
3 Correct 1 ms 460 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 432 KB Output is correct
9 Correct 0 ms 324 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct

Subtask #5
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 3 ms 1480 KB Output is correct
3 Correct 5 ms 2516 KB Output is correct
4 Correct 7 ms 3604 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 328 KB Output is correct
10 Correct 8 ms 3572 KB Output is correct
11 Correct 8 ms 3568 KB Output is correct
12 Correct 9 ms 3648 KB Output is correct
13 Correct 11 ms 3620 KB Output is correct
14 Correct 9 ms 3484 KB Output is correct
15 Correct 8 ms 3492 KB Output is correct
16 Correct 8 ms 3484 KB Output is correct
17 Correct 7 ms 3488 KB Output is correct
18 Correct 7 ms 3360 KB Output is correct
19 Correct 7 ms 3364 KB Output is correct
20 Correct 1 ms 324 KB Output is correct
21 Correct 1 ms 324 KB Output is correct
22 Correct 1 ms 460 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 1 ms 332 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 432 KB Output is correct
28 Correct 0 ms 324 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 8 ms 3604 KB Output is correct
33 Correct 8 ms 3604 KB Output is correct
34 Correct 9 ms 3608 KB Output is correct
35 Correct 7 ms 3500 KB Output is correct
36 Correct 8 ms 3484 KB Output is correct
37 Correct 9 ms 3612 KB Output is correct
38 Correct 8 ms 3616 KB Output is correct
39 Correct 8 ms 3500 KB Output is correct
40 Correct 7 ms 3412 KB Output is correct
41 Correct 8 ms 3436 KB Output is correct