Submission #870924

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
870924	2023-11-09T13:17:11 Z	hungnt	Ekoeko (COCI21_ekoeko)	C++14	110 / 110	8 ms	2188 KB

Main

#include<bits/stdc++.h>

using namespace std;

const int N = 200005;

int n;
string s;
queue<int> q[26];
int cnt[26], dem[26], BIT[N];

void update(int id)
{
    for(; id; id -= id & -id)
        BIT[id]++;
}

int get(int id)
{
    int ans = 0;
    for(; id <= n; id += id & -id)
        ans += BIT[id];
    return ans;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    cin >> n >> s;
    for(char &c : s)
    {
        c -= 'a';
        cnt[c]++;
    }
    int nn = n;
    s = ' ' + s;
    n <<= 1;
    int d = 0;
    long long ans = 0;
    int c;
    int x;
    for(int i = 1; i <= n; i++)
    {
        c = s[i];
        dem[c]++;
        if(dem[c] <= (cnt[c] >> 1))
        {
            x = ++d;
            q[c].push(d + nn);
        }
        else
        {
            x = q[c].front();
            q[c].pop();
        }
        ans += get(x);
        update(x);
    }
    cout << ans;
    return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:34:13: warning: array subscript has type 'char' [-Wchar-subscripts]
   34 |         cnt[c]++;
      |             ^

Subtask #1

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	348 KB	Output is correct
2	Correct	2 ms	852 KB	Output is correct
3	Correct	4 ms	1380 KB	Output is correct
4	Correct	5 ms	1828 KB	Output is correct

Subtask #2

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	348 KB	Output is correct
2	Correct	2 ms	852 KB	Output is correct
3	Correct	4 ms	1380 KB	Output is correct
4	Correct	5 ms	1828 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	1 ms	348 KB	Output is correct
2	Correct	2 ms	852 KB	Output is correct
3	Correct	4 ms	1380 KB	Output is correct
4	Correct	5 ms	1828 KB	Output is correct
5	Correct	1 ms	348 KB	Output is correct
6	Correct	8 ms	2084 KB	Output is correct
7	Correct	6 ms	2080 KB	Output is correct
8	Correct	6 ms	1848 KB	Output is correct
9	Correct	6 ms	1832 KB	Output is correct
10	Correct	6 ms	1968 KB	Output is correct
11	Correct	6 ms	1832 KB	Output is correct
12	Correct	7 ms	1836 KB	Output is correct
13	Correct	7 ms	1856 KB	Output is correct
14	Correct	6 ms	1844 KB	Output is correct
15	Correct	6 ms	1844 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	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	0 ms	484 KB	Output is correct
11	Correct	1 ms	348 KB	Output is correct

Subtask #5

40.0 / 40.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	348 KB	Output is correct
2	Correct	2 ms	852 KB	Output is correct
3	Correct	4 ms	1380 KB	Output is correct
4	Correct	5 ms	1828 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	1 ms	348 KB	Output is correct
10	Correct	8 ms	2084 KB	Output is correct
11	Correct	6 ms	2080 KB	Output is correct
12	Correct	6 ms	1848 KB	Output is correct
13	Correct	6 ms	1832 KB	Output is correct
14	Correct	6 ms	1968 KB	Output is correct
15	Correct	6 ms	1832 KB	Output is correct
16	Correct	7 ms	1836 KB	Output is correct
17	Correct	7 ms	1856 KB	Output is correct
18	Correct	6 ms	1844 KB	Output is correct
19	Correct	6 ms	1844 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	0 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	484 KB	Output is correct
30	Correct	1 ms	348 KB	Output is correct
31	Correct	0 ms	484 KB	Output is correct
32	Correct	7 ms	1972 KB	Output is correct
33	Correct	7 ms	1960 KB	Output is correct
34	Correct	7 ms	1880 KB	Output is correct
35	Correct	6 ms	2188 KB	Output is correct
36	Correct	6 ms	1832 KB	Output is correct
37	Correct	6 ms	1836 KB	Output is correct
38	Correct	6 ms	1840 KB	Output is correct
39	Correct	6 ms	1812 KB	Output is correct
40	Correct	7 ms	2096 KB	Output is correct
41	Correct	6 ms	1840 KB	Output is correct