oj.uz

Submission #1102691

# Submission time Handle Problem Language Result Execution time Memory
1102691 2024-10-18T16:00:12 Z toast12 Group Photo (JOI21_ho_t3) C++14
12 / 100
 405 ms 504 KB 
#include <bits/stdc++.h>
using namespace std;

const int INF = 1e9;

int n;
vector<int> idx;

int cost(vector<int> &p) {
    // check if the arrangement is valid
    for (int i = 0; i < n-1; i++) {
        if (p[i] >= p[i+1]+2) return INF;
    }
    int res = 0;
    for (int i = 0; i < n; i++) {
        for (int j = i+1; j < n; j++) {
            if (idx[p[j]] < idx[p[i]]) res++;
        }
    }
    return res;
}

int main() {
    // n <= 20
    cin >> n;
    idx.resize(n+1);
    vector<int> h(n);
    for (int i = 0; i < n; i++) {
        cin >> h[i];
        idx[h[i]] = i;
    }
    int ans = INT_MAX;
    for (int mask = 0; mask < (1<<n); mask++) {
        vector<int> flip;
        for (int i = 0; i < n; i++) {
            if (mask & (1<<i)) flip.push_back(i);
        }
        if (flip.size() == 0 || (flip.size() > 1 && flip[0] == 0)) continue;
        vector<int> p(n);
        iota(p.begin(), p.end(), 1);
        int prev = 0;
        for (int i = 0; i < flip.size(); i++) {
            reverse(p.begin()+prev, p.begin()+flip[i]);
            prev = flip[i];
        }
        reverse(p.begin()+prev, p.end());
        ans = min(ans, cost(p));
        prev = 0;
        for (int i = 0; i < flip.size(); i++) {
            reverse(p.begin()+prev, p.begin()+flip[i]);
            prev = flip[i];
        }
        reverse(p.begin()+prev, p.end());
    }
    cout << ans << '\n';
    return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:42:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |         for (int i = 0; i < flip.size(); i++) {
      |                         ~~^~~~~~~~~~~~~
Main.cpp:49:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         for (int i = 0; i < flip.size(); i++) {
      |                         ~~^~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 106 ms 504 KB Output is correct
12 Correct 183 ms 336 KB Output is correct
13 Correct 197 ms 336 KB Output is correct
14 Correct 384 ms 336 KB Output is correct
15 Correct 399 ms 420 KB Output is correct
16 Correct 386 ms 336 KB Output is correct
17 Correct 364 ms 336 KB Output is correct
18 Correct 405 ms 428 KB Output is correct
19 Correct 384 ms 340 KB Output is correct
20 Correct 405 ms 340 KB Output is correct

Subtask #3
0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 106 ms 504 KB Output is correct
12 Correct 183 ms 336 KB Output is correct
13 Correct 197 ms 336 KB Output is correct
14 Correct 384 ms 336 KB Output is correct
15 Correct 399 ms 420 KB Output is correct
16 Correct 386 ms 336 KB Output is correct
17 Correct 364 ms 336 KB Output is correct
18 Correct 405 ms 428 KB Output is correct
19 Correct 384 ms 340 KB Output is correct
20 Correct 405 ms 340 KB Output is correct
21 Incorrect 2 ms 340 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 106 ms 504 KB Output is correct
12 Correct 183 ms 336 KB Output is correct
13 Correct 197 ms 336 KB Output is correct
14 Correct 384 ms 336 KB Output is correct
15 Correct 399 ms 420 KB Output is correct
16 Correct 386 ms 336 KB Output is correct
17 Correct 364 ms 336 KB Output is correct
18 Correct 405 ms 428 KB Output is correct
19 Correct 384 ms 340 KB Output is correct
20 Correct 405 ms 340 KB Output is correct
21 Incorrect 2 ms 340 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #5
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 106 ms 504 KB Output is correct
12 Correct 183 ms 336 KB Output is correct
13 Correct 197 ms 336 KB Output is correct
14 Correct 384 ms 336 KB Output is correct
15 Correct 399 ms 420 KB Output is correct
16 Correct 386 ms 336 KB Output is correct
17 Correct 364 ms 336 KB Output is correct
18 Correct 405 ms 428 KB Output is correct
19 Correct 384 ms 340 KB Output is correct
20 Correct 405 ms 340 KB Output is correct
21 Incorrect 2 ms 340 KB Output isn't correct
22 Halted 0 ms 0 KB -