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답안 #540814

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
540814 2022-03-21T19:48:02 Z AlperenT Ekoeko (COCI21_ekoeko) C++17
110 / 110
 14 ms 3652 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = (1e5 + 5) * 2;

int n, cnt[26];
long long ans;

string str;

vector<char> strv;

vector<int> indx[26], v;

struct Fenwick{
    int tree[N];

    int getsum(int r){
        int sum = 0;
        for(int i = r; i > 0; i -= i & -i) sum += tree[i];
        return sum;
    }

    int query(int l, int r){
        if(l > r) return 0;
        return getsum(r) - getsum(l - 1);
    }

    void update(int pos, int val){
        for(int i = pos; i < N; i += i & -i) tree[i] += val;
    }
};

Fenwick fw;

int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);

    cin >> n;
    cin >> str;

    n *= 2;

    for(auto c : str) cnt[c - 'a']++;

    for(int i = 0; i < n; i++){
        if(cnt[str[i] - 'a'] > 0){
            strv.push_back(str[i]);
            cnt[str[i] - 'a'] -= 2;
        }
    }

    for(int i = 0, m = strv.size(); i < m; i++) strv.push_back(strv[i]);

    for(int i = 0; i < n; i++) indx[strv[i] - 'a'].push_back(i + 1);

    for(int i = 0; i < 26; i++) reverse(indx[i].begin(), indx[i].end());

    for(int i = 0; i < n; i++){
        v.push_back(indx[str[i] - 'a'].back());
        indx[str[i] - 'a'].pop_back();
    }

    for(auto i : v){
        ans += fw.query(i + 1, n);
        fw.update(i, 1);
    }

    cout << ans;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 4 ms 1612 KB Output is correct
3 Correct 9 ms 2424 KB Output is correct
4 Correct 12 ms 3296 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 4 ms 1612 KB Output is correct
3 Correct 9 ms 2424 KB Output is correct
4 Correct 12 ms 3296 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 340 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 4 ms 1612 KB Output is correct
3 Correct 9 ms 2424 KB Output is correct
4 Correct 12 ms 3296 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 13 ms 3584 KB Output is correct
7 Correct 13 ms 3588 KB Output is correct
8 Correct 13 ms 3532 KB Output is correct
9 Correct 14 ms 3472 KB Output is correct
10 Correct 14 ms 3540 KB Output is correct
11 Correct 13 ms 3464 KB Output is correct
12 Correct 12 ms 3436 KB Output is correct
13 Correct 13 ms 3540 KB Output is correct
14 Correct 12 ms 3412 KB Output is correct
15 Correct 14 ms 3348 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 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 332 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 340 KB Output is correct

Subtask #5
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 4 ms 1612 KB Output is correct
3 Correct 9 ms 2424 KB Output is correct
4 Correct 12 ms 3296 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 13 ms 3584 KB Output is correct
11 Correct 13 ms 3588 KB Output is correct
12 Correct 13 ms 3532 KB Output is correct
13 Correct 14 ms 3472 KB Output is correct
14 Correct 14 ms 3540 KB Output is correct
15 Correct 13 ms 3464 KB Output is correct
16 Correct 12 ms 3436 KB Output is correct
17 Correct 13 ms 3540 KB Output is correct
18 Correct 12 ms 3412 KB Output is correct
19 Correct 14 ms 3348 KB Output is correct
20 Correct 1 ms 340 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 332 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 13 ms 3504 KB Output is correct
33 Correct 12 ms 3652 KB Output is correct
34 Correct 13 ms 3592 KB Output is correct
35 Correct 14 ms 3548 KB Output is correct
36 Correct 14 ms 3516 KB Output is correct
37 Correct 13 ms 3584 KB Output is correct
38 Correct 13 ms 3492 KB Output is correct
39 Correct 12 ms 3328 KB Output is correct
40 Correct 13 ms 3412 KB Output is correct
41 Correct 13 ms 3400 KB Output is correct