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답안 #373493

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
373493 2021-03-04T20:26:11 Z SorahISA Group Photo (JOI21_ho_t3) C++17
64 / 100
 5000 ms 212136 KB 
#pragma GCC optimize("Ofast", "unroll-loops")
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define double long double
using pii = pair<int, int>;
template<typename T>
using Prior = std::priority_queue<T>;
template<typename T>
using prior = std::priority_queue<T, vector<T>, greater<T>>;

#define X first
#define Y second
#define eb emplace_back
#define ALL(x) begin(x), end(x)
#define RALL(x) rbegin(x), rend(x)
#define fastIO() ios_base::sync_with_stdio(0), cin.tie(0)

template<class T>
inline ostream& operator << (ostream& os, vector<T> vec) {
    for (auto x : vec) os << x << " ";
    return os;
}

const int maxn = 5000 + 5;
const int INF = INT_MAX;

int dp[maxn][maxn], BIT[maxn];
vector<int> rightV[maxn];

void Add(int idx, int val) {
    while (idx < maxn) BIT[idx] += val, idx += idx & -idx;
}

int Sum(int idx, int ans = 0) {
    while (idx) ans += BIT[idx], idx -= idx & -idx;
    return ans;
}

void solve() {
    int n; cin >> n;
    
    vector<int> v(n), pl(n+1), pre_pl(n+1);
    for (auto &x : v) cin >> x;
    
    for (int i = 0; i < n; ++i) {
        rightV[v[i]].eb(0), rightV[v[i]].eb(n+1);
        for (int j = i+1; j < n; ++j) rightV[v[i]].eb(v[j]);
        sort(ALL(rightV[v[i]]));
    }
    for (int i = 0; i < n; ++i) pl[v[i]] = i + 1;
    partial_sum(ALL(pl), begin(pre_pl));
    
    // cout << pl << "\n" << pre_pl << "\n";
    // for (int i = 1; i <= n; ++i) cout << rightV[i] << "\n";
    
    for (int i = 1; i <= n; ++i) {
        memset(BIT, 0x00, sizeof(BIT));
        for (int k = i; k > 0; --k) Add(pl[k], 1), dp[i][0] -= Sum(pl[k]);
        
        for (int j = 1; j < i; ++j) {
            // cout << "dp[" << i << "][" << j << "]: ";
            dp[i][j] = dp[i][j-1] + Sum(pl[j]);
            
            int lo = 0, hi = rightV[j].size()-1, mi;
            while (lo < hi) {
                mi = lo + hi >> 1;
                if (rightV[j][mi] > i) hi = mi;
                else lo = mi + 1;
            }
            dp[i][j] -= lo;
            // cout << lo << " ";
            
            lo = 0, hi = rightV[j].size()-1;
            while (lo < hi) {
                mi = lo + hi >> 1;
                if (rightV[j][mi] > j) hi = mi;
                else lo = mi + 1;
            }
            dp[i][j] += lo;
            // cout << lo << "\n";
        }
    }
    
    // for (int i = 1; i <= n; ++i) {
        // cout << setw(2) << i << ": ";
        // for (int j = 0; j < n; ++j) cout << setw(3) << dp[i][j] << " \n"[j == n-1];
    // }
    
    int ans = INF;
    for (int j = 0; j < n; ++j) {
        for (int i = j+1; i <= n; ++i) dp[i][j] += pre_pl[i] - pre_pl[j];
        dp[j][j] = *min_element(dp[j], dp[j] + j);
        for (int i = j+1; i <= n; ++i) dp[i][j] += dp[j][j];
        ans = min(ans, dp[n][j]);
    }
    cout << ans << "\n";
    
    // for (int i = 1; i <= n; ++i) {
        // cout << setw(2) << i << ": ";
        // for (int j = 0; j < n; ++j) cout << setw(3) << dp[i][j] << " \n"[j == n-1];
    // }
}

int32_t main() {
    fastIO();
    
    int t = 1; // cin >> t;
    while (t--) solve();
    
    return 0;
}

/*
9
6 1 3 4 9 5 7 8 2
*/

/*
array after sort: [a_1, 1], [a_2, a_1), ..., [a_k, a_{k-1}), [N, a_k)
which 1 <= a_1 < a_2 < ... < a_k < N
dp[i][j]: the minimum operations to sort range (j, i] if [1, j] is sorted
*/

Compilation message

Main.cpp: In function 'void solve()':
Main.cpp:68:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   68 |                 mi = lo + hi >> 1;
      |                      ~~~^~~~
Main.cpp:77:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   77 |                 mi = lo + hi >> 1;
      |                      ~~~^~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 492 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 492 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 620 KB Output is correct
12 Correct 1 ms 620 KB Output is correct
13 Correct 1 ms 620 KB Output is correct
14 Correct 1 ms 620 KB Output is correct
15 Correct 1 ms 620 KB Output is correct
16 Correct 1 ms 620 KB Output is correct
17 Correct 1 ms 768 KB Output is correct
18 Correct 1 ms 620 KB Output is correct
19 Correct 1 ms 620 KB Output is correct
20 Correct 1 ms 620 KB Output is correct

Subtask #3
32.0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 492 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 620 KB Output is correct
12 Correct 1 ms 620 KB Output is correct
13 Correct 1 ms 620 KB Output is correct
14 Correct 1 ms 620 KB Output is correct
15 Correct 1 ms 620 KB Output is correct
16 Correct 1 ms 620 KB Output is correct
17 Correct 1 ms 768 KB Output is correct
18 Correct 1 ms 620 KB Output is correct
19 Correct 1 ms 620 KB Output is correct
20 Correct 1 ms 620 KB Output is correct
21 Correct 5 ms 1644 KB Output is correct
22 Correct 5 ms 1644 KB Output is correct
23 Correct 4 ms 1644 KB Output is correct
24 Correct 5 ms 1772 KB Output is correct
25 Correct 5 ms 1776 KB Output is correct
26 Correct 5 ms 1772 KB Output is correct
27 Correct 5 ms 1772 KB Output is correct
28 Correct 4 ms 1772 KB Output is correct
29 Correct 5 ms 1772 KB Output is correct
30 Correct 5 ms 1772 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 492 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 620 KB Output is correct
12 Correct 1 ms 620 KB Output is correct
13 Correct 1 ms 620 KB Output is correct
14 Correct 1 ms 620 KB Output is correct
15 Correct 1 ms 620 KB Output is correct
16 Correct 1 ms 620 KB Output is correct
17 Correct 1 ms 768 KB Output is correct
18 Correct 1 ms 620 KB Output is correct
19 Correct 1 ms 620 KB Output is correct
20 Correct 1 ms 620 KB Output is correct
21 Correct 5 ms 1644 KB Output is correct
22 Correct 5 ms 1644 KB Output is correct
23 Correct 4 ms 1644 KB Output is correct
24 Correct 5 ms 1772 KB Output is correct
25 Correct 5 ms 1776 KB Output is correct
26 Correct 5 ms 1772 KB Output is correct
27 Correct 5 ms 1772 KB Output is correct
28 Correct 4 ms 1772 KB Output is correct
29 Correct 5 ms 1772 KB Output is correct
30 Correct 5 ms 1772 KB Output is correct
31 Correct 68 ms 9964 KB Output is correct
32 Correct 82 ms 9964 KB Output is correct
33 Correct 70 ms 9964 KB Output is correct
34 Correct 69 ms 9964 KB Output is correct
35 Correct 68 ms 9976 KB Output is correct
36 Correct 73 ms 9964 KB Output is correct
37 Correct 70 ms 9964 KB Output is correct
38 Correct 67 ms 9964 KB Output is correct
39 Correct 67 ms 9964 KB Output is correct
40 Correct 68 ms 9964 KB Output is correct

Subtask #5
0 / 36.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 492 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 620 KB Output is correct
12 Correct 1 ms 620 KB Output is correct
13 Correct 1 ms 620 KB Output is correct
14 Correct 1 ms 620 KB Output is correct
15 Correct 1 ms 620 KB Output is correct
16 Correct 1 ms 620 KB Output is correct
17 Correct 1 ms 768 KB Output is correct
18 Correct 1 ms 620 KB Output is correct
19 Correct 1 ms 620 KB Output is correct
20 Correct 1 ms 620 KB Output is correct
21 Correct 5 ms 1644 KB Output is correct
22 Correct 5 ms 1644 KB Output is correct
23 Correct 4 ms 1644 KB Output is correct
24 Correct 5 ms 1772 KB Output is correct
25 Correct 5 ms 1776 KB Output is correct
26 Correct 5 ms 1772 KB Output is correct
27 Correct 5 ms 1772 KB Output is correct
28 Correct 4 ms 1772 KB Output is correct
29 Correct 5 ms 1772 KB Output is correct
30 Correct 5 ms 1772 KB Output is correct
31 Correct 68 ms 9964 KB Output is correct
32 Correct 82 ms 9964 KB Output is correct
33 Correct 70 ms 9964 KB Output is correct
34 Correct 69 ms 9964 KB Output is correct
35 Correct 68 ms 9976 KB Output is correct
36 Correct 73 ms 9964 KB Output is correct
37 Correct 70 ms 9964 KB Output is correct
38 Correct 67 ms 9964 KB Output is correct
39 Correct 67 ms 9964 KB Output is correct
40 Correct 68 ms 9964 KB Output is correct
41 Execution timed out 5102 ms 212136 KB Time limit exceeded
42 Halted 0 ms 0 KB -