oj.uz

답안 #866485

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
866485 2023-10-26T08:51:54 Z TAhmed33 Ekoeko (COCI21_ekoeko) C++
0 / 110
 1000 ms 2140 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int MAXN = 1e5 + 25;
struct bit {
	int tree[MAXN];
	void add (int x) {
		for (; x < MAXN; x += x & (-x)) {
			assert(x < MAXN);
			tree[x]++;
		}
	}
	int get (int x) {
		int sum = 0; for (; x; x -= x & (-x)) {
			assert(x > 0);
			sum += tree[x];
		}
		return sum;
	}
} cur;
int n;
string s;
vector <int> occ[26];
signed main () {
	ios::sync_with_stdio(0);
	cin.tie(0); memset(cur.tree, 0, sizeof(cur.tree));
	cin >> n >> s;
	s.insert(s.begin(), '0');
	for (int i = 1; i <= n; i++) occ[s[i] - 'a'].push_back(i);
	for (int i = 0; i < 26; i++) reverse(occ[i].begin(), occ[i].end());
	long long cnt = 0;
	for (int i = n + 1; i <= 2 * n; i++) {
		int u = occ[s[i] - 'a'].back();
		occ[s[i] - 'a'].pop_back();
		cnt += cur.get(u); cur.add(u);
	}
	cout << n * (n - 1) / 2 - cnt << '\n';
}
/*aabcdffa
adaffacb

1,2,3,4,5,6,7,8
1,5,2,6,7,8,4,3*/

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 2140 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 2140 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 2140 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Execution timed out 1062 ms 1116 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 2 ms 2140 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -