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답안 #532023

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
532023 2022-03-02T03:53:30 Z Killer2501 Ekoeko (COCI21_ekoeko) C++14
110 / 110
 38 ms 14344 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<ll, int>
#define fi first
#define se second
using namespace std;
const int N = 2e5+2;
const int M = 52;
const int mod = 1e9+7;
const ll base = 75;
const ll inf = 1e16;
int n, lab[N], t, c[N], h[N], m, a[N], b[N], d[N], k;
ll ans;
vector<int> adj[N], g[N];
vector<int> vi;
string s;
bool vis[N];
ll pw(ll k, ll n)
{
    ll total = 1;
    for(; n; n >>= 1)
    {
        if(n&1)total = total * k % mod;
        k = k * k % mod;
    }
    return total;
}
void add(int& x, int y)
{
    x += y;
    if(x >= mod)x -= mod;
}
int findp(int u)
{
    return lab[u] < 0 ? u : lab[u] = findp(lab[u]);
}
void hop(int u, int v)
{
    u = findp(u);
    v = findp(v);
    if(u == v)return;
    if(lab[u] > lab[v])swap(u, v);
    lab[u] += lab[v];
    lab[v] = u;
}
struct BIT
{
    int n;
    vector<ll> fe;
    BIT(){}
    void init(int _n)
    {
        n = _n;
        fe.resize(n+1, 0);
    }
    void reset()
    {
        fill(fe.begin(), fe.end(), 0);
    }
    void add(int id, int x)
    {
        for(; id <= n; id += id & -id)fe[id] += x;
    }
    ll get(int id)
    {
        ll total = 0;
        for(; id; id -= id & -id)total += fe[id];
        return total;
    }
};
void sol()
{
    cin >> n >> s;
    for(int i = 1; i <= n*2; i ++)
        adj[s[i-1]-'a'].pb(i);
    for(int p = 0; p < 26; p ++)
    {
        if(adj[p].empty())continue;
        m = adj[p].size();
        for(int i = 0; i < m/2; i ++)vi.pb(adj[p][i]);
    }
    BIT bit;
    bit.init(n*2);
    sort(vi.begin(), vi.end());
    for(int i = 0; i < n; i ++)
    {
        ans += bit.get(n*2) - bit.get(vi[i]);
        bit.add(vi[i], 1);
        g[s[vi[i]-1]-'a'].pb(i+1);
    }
    vi.clear();
    for(int p = 0; p < 26; p ++)
    {
        if(adj[p].empty())continue;
        m = adj[p].size();
        for(int i = 0; i < m/2; i ++)vi.pb(adj[p][i+m/2]);
    }
    sort(vi.begin(),vi.end());
    for(int i = 0; i < n; i ++)
    {
        ans += bit.get(n*2) - bit.get(vi[i]);
        bit.add(vi[i], 1);
        g[s[vi[i]-1]-'a'].pb(i+n+1);
    }
    for(int i = 0; i < 26; i ++)
    {
        if(g[i].empty())continue;
        m = g[i].size();

        for(int j = m/2; j < m; j ++)
        {
            a[g[i][j]-n] = g[i][j-m/2];
            //cout << g[i][j-m/2] <<" "<< g[i][j]-n << '\n';
        }
    }
    bit.reset();
    for(int i = 1; i <= n; i ++)
    {
        ans += bit.get(n) - bit.get(a[i]);
        bit.add(a[i], 1);
    }
    cout << ans;
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "test"
    if(fopen(task".inp", "r"))
    {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int test = 1;
    //cin >> test;
    while(test -- > 0)sol();
    return 0;
}
/*
1234
21
*/

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:136:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  136 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:137:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  137 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 13 ms 11432 KB Output is correct
3 Correct 18 ms 13096 KB Output is correct
4 Correct 25 ms 14216 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 13 ms 11432 KB Output is correct
3 Correct 18 ms 13096 KB Output is correct
4 Correct 25 ms 14216 KB Output is correct
5 Correct 5 ms 9716 KB Output is correct
6 Correct 5 ms 9720 KB Output is correct
7 Correct 5 ms 9724 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 13 ms 11432 KB Output is correct
3 Correct 18 ms 13096 KB Output is correct
4 Correct 25 ms 14216 KB Output is correct
5 Correct 5 ms 9724 KB Output is correct
6 Correct 30 ms 14280 KB Output is correct
7 Correct 28 ms 14244 KB Output is correct
8 Correct 37 ms 14248 KB Output is correct
9 Correct 37 ms 14264 KB Output is correct
10 Correct 36 ms 14216 KB Output is correct
11 Correct 30 ms 14084 KB Output is correct
12 Correct 32 ms 14160 KB Output is correct
13 Correct 30 ms 14060 KB Output is correct
14 Correct 29 ms 14032 KB Output is correct
15 Correct 31 ms 13992 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 9624 KB Output is correct
2 Correct 5 ms 9676 KB Output is correct
3 Correct 6 ms 9676 KB Output is correct
4 Correct 6 ms 9756 KB Output is correct
5 Correct 6 ms 9724 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 5 ms 9676 KB Output is correct
8 Correct 6 ms 9676 KB Output is correct
9 Correct 6 ms 9676 KB Output is correct
10 Correct 6 ms 9676 KB Output is correct
11 Correct 6 ms 9724 KB Output is correct

Subtask #5
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 13 ms 11432 KB Output is correct
3 Correct 18 ms 13096 KB Output is correct
4 Correct 25 ms 14216 KB Output is correct
5 Correct 5 ms 9716 KB Output is correct
6 Correct 5 ms 9720 KB Output is correct
7 Correct 5 ms 9724 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9724 KB Output is correct
10 Correct 30 ms 14280 KB Output is correct
11 Correct 28 ms 14244 KB Output is correct
12 Correct 37 ms 14248 KB Output is correct
13 Correct 37 ms 14264 KB Output is correct
14 Correct 36 ms 14216 KB Output is correct
15 Correct 30 ms 14084 KB Output is correct
16 Correct 32 ms 14160 KB Output is correct
17 Correct 30 ms 14060 KB Output is correct
18 Correct 29 ms 14032 KB Output is correct
19 Correct 31 ms 13992 KB Output is correct
20 Correct 6 ms 9624 KB Output is correct
21 Correct 5 ms 9676 KB Output is correct
22 Correct 6 ms 9676 KB Output is correct
23 Correct 6 ms 9756 KB Output is correct
24 Correct 6 ms 9724 KB Output is correct
25 Correct 5 ms 9676 KB Output is correct
26 Correct 5 ms 9676 KB Output is correct
27 Correct 6 ms 9676 KB Output is correct
28 Correct 6 ms 9676 KB Output is correct
29 Correct 6 ms 9676 KB Output is correct
30 Correct 6 ms 9724 KB Output is correct
31 Correct 6 ms 9724 KB Output is correct
32 Correct 33 ms 14344 KB Output is correct
33 Correct 29 ms 14268 KB Output is correct
34 Correct 33 ms 14220 KB Output is correct
35 Correct 33 ms 14196 KB Output is correct
36 Correct 34 ms 14092 KB Output is correct
37 Correct 32 ms 14256 KB Output is correct
38 Correct 38 ms 14108 KB Output is correct
39 Correct 33 ms 14156 KB Output is correct
40 Correct 30 ms 14044 KB Output is correct
41 Correct 30 ms 14004 KB Output is correct