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Submission #707577

# Submission time Handle Problem Language Result Execution time Memory
707577 2023-03-09T11:25:29 Z Trisanu_Das Ekoeko (COCI21_ekoeko) C++17
110 / 110
 13 ms 2728 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define ar array
 
const int mxN=1e5;
int n, cnt[26], p[mxN], ft[mxN+1];
string s, a, b;
ll ans;
vector<int> oc1[26], oc2[26];
 
void upd(int i) {
	for (++i; i <= n; i += i & -i) ++ft[i];
}
 
int qry(int i) {
	int ans = 0;
	for (++i; i > 0; i -= i & -i) ans += ft[i];
	return ans;
}

int main() {
	cin >> n >> s;
	for (char c : s) ++cnt[c-'a'];
	for (int i=0; i<26; ++i) cnt[i] /= 2;
	for (int i = 0, x = 0; i < 2*n; ++i) {
		if (cnt[s[i]-'a']) a += s[i], ans += x, --cnt[s[i]-'a'];
		else b += s[i], ++x;
	}
	for (int i = 0; i < n; ++i) {
		oc1[a[i] - 'a'].push_back(i);
		oc2[b[i] - 'a'].push_back(i);
	}
	for (int i = 0; i < 26; ++i)
		for (int j=0; j<oc1[i].size(); ++j)
			p[oc2[i][j]] = oc1[i][j];
	for (int i=0; i<n; ++i) {
		ans += i - qry(p[i]);
		upd(p[i]);
	}
	cout << ans << '\n';
	return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:36:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |   for (int j=0; j<oc1[i].size(); ++j)
      |                 ~^~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 4 ms 1244 KB Output is correct
3 Correct 8 ms 2080 KB Output is correct
4 Correct 12 ms 2728 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 4 ms 1244 KB Output is correct
3 Correct 8 ms 2080 KB Output is correct
4 Correct 12 ms 2728 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 4 ms 1244 KB Output is correct
3 Correct 8 ms 2080 KB Output is correct
4 Correct 12 ms 2728 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 12 ms 2640 KB Output is correct
7 Correct 12 ms 2676 KB Output is correct
8 Correct 12 ms 2584 KB Output is correct
9 Correct 13 ms 2640 KB Output is correct
10 Correct 13 ms 2536 KB Output is correct
11 Correct 11 ms 2532 KB Output is correct
12 Correct 11 ms 2532 KB Output is correct
13 Correct 12 ms 2532 KB Output is correct
14 Correct 12 ms 2552 KB Output is correct
15 Correct 12 ms 2528 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 268 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 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct

Subtask #5
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 4 ms 1244 KB Output is correct
3 Correct 8 ms 2080 KB Output is correct
4 Correct 12 ms 2728 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 12 ms 2640 KB Output is correct
11 Correct 12 ms 2676 KB Output is correct
12 Correct 12 ms 2584 KB Output is correct
13 Correct 13 ms 2640 KB Output is correct
14 Correct 13 ms 2536 KB Output is correct
15 Correct 11 ms 2532 KB Output is correct
16 Correct 11 ms 2532 KB Output is correct
17 Correct 12 ms 2532 KB Output is correct
18 Correct 12 ms 2552 KB Output is correct
19 Correct 12 ms 2528 KB Output is correct
20 Correct 1 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 268 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 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 0 ms 212 KB Output is correct
32 Correct 13 ms 2588 KB Output is correct
33 Correct 12 ms 2660 KB Output is correct
34 Correct 12 ms 2652 KB Output is correct
35 Correct 13 ms 2532 KB Output is correct
36 Correct 13 ms 2628 KB Output is correct
37 Correct 12 ms 2572 KB Output is correct
38 Correct 11 ms 2532 KB Output is correct
39 Correct 11 ms 2536 KB Output is correct
40 Correct 11 ms 2500 KB Output is correct
41 Correct 11 ms 2404 KB Output is correct