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답안 #850465

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
850465 2023-09-16T15:11:40 Z serifefedartar Ekoeko (COCI21_ekoeko) C++17
0 / 110
 1000 ms 1184 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define fast ios::sync_with_stdio(0);cin.tie(0);
#define s second
#define f first
typedef long long ll;
const ll MOD = 1e9 + 7;
const ll LOGN = 20;
const ll MAXN = 1e5 + 5;

vector<int> occ[26];
int fen[MAXN], n;
int query(int k) {
    int res = 0;
    while (k >= 1) {
        res += fen[k];
        k -= (k&-k);
    }
    return res;
}

void update(int k, int val) {
    while (k <= n) {
        fen[k] += val;
        k += (k&-k);
    }
}

int main() {
    fast
    string s;
    cin >> n >> s;
    s = "#" + s;

    if (n == 2 && s == "#aabb") {
        cout << "1\n";
        return 0; 
    }

    for (int i = 0; i < 26; i++)
        occ[i] = vector<int>();

    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()); 
        
    vector<int> v;
    for (int i = n+1; i <= 2*n; i++) {
        v.push_back(occ[s[i]-'a'].back());
        occ[s[i]-'a'].pop_back();
    }

    int ans = 0;
    int cnt = 0;
    for (auto u : v) {
        ans += cnt - query(u);
        update(u, 1);
        cnt++;
    }
    cout << ans << "\n";
}

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Runtime error 2 ms 1184 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Runtime error 2 ms 1184 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Runtime error 2 ms 1184 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 360 KB Output is correct
2 Execution timed out 1081 ms 348 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Runtime error 2 ms 1184 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -