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Submission #1000329

# Submission time Handle Problem Language Result Execution time Memory
1000329 2024-06-17T08:54:22 Z MateiKing80 Monochrome Points (JOI20_monochrome) C++14
100 / 100
 1030 ms 15568 KB 
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
#define int ll

string s;
vector<int> w, b;

struct AIB
{
    vector<int> aib;
    AIB(int N)
    {
        aib.resize(N + 1, 0);
    }
    inline int lsb(int x)
    {
        return x & -x;
    }
    void update(int pos, int val)
    {
        while(pos < aib.size())
            aib[pos] += val, pos += lsb(pos);
    }
    int query(int pos)
    {
        int ans = 0;
        while(pos)
            ans += aib[pos], pos -= lsb(pos);
        return ans;
    }
};

int n;

int nrInv(int k)
{
    int ans = 0;
    AIB ds(2 * n + 5);
    vector<pair<int, int>> v;
    for(int i = 0; i < n; i ++)
        v.push_back({w[i], b[(i + k) % n]});
    for(int i = 0; i < n; i ++)
        if(v[i].first > v[i].second)
            swap(v[i].first, v[i].second);
    sort(v.begin(), v.end());
    for(int i = 0; i < n; i ++)
    {
        //cout << v[i].first << " " << v[i].second << "\n";
        ans += ds.query(v[i].second) - ds.query(v[i].first);
        ds.update(v[i].second, 1);
    }
    //cout << '\n';
    return ans;
}

signed main()
{
    cin >> n >> s;
    for(int i = 0; i < 2 * n; i ++)
    {
        if(s[i] == 'B')
            b.push_back(i + 1);
        else
            w.push_back(i + 1);
    }
    int pas = (1 << 20), pos = -1;
    while(pas)
    {
        if(nrInv(pos + pas) <= nrInv(pos + pas + 1))
            pos += pas;
        pas /= 2;
    }
    cout << nrInv(pos + 1);
}

Compilation message

monochrome.cpp: In member function 'void AIB::update(ll, ll)':
monochrome.cpp:24:19: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         while(pos < aib.size())
      |               ~~~~^~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 2 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 2 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 6 ms 348 KB Output is correct
35 Correct 7 ms 348 KB Output is correct
36 Correct 6 ms 348 KB Output is correct
37 Correct 6 ms 348 KB Output is correct
38 Correct 4 ms 348 KB Output is correct
39 Correct 4 ms 348 KB Output is correct
40 Correct 4 ms 348 KB Output is correct
41 Correct 4 ms 348 KB Output is correct
42 Correct 5 ms 348 KB Output is correct
43 Correct 5 ms 348 KB Output is correct
44 Correct 5 ms 440 KB Output is correct
45 Correct 5 ms 348 KB Output is correct
46 Correct 7 ms 576 KB Output is correct
47 Correct 4 ms 348 KB Output is correct
48 Correct 4 ms 436 KB Output is correct
49 Correct 3 ms 348 KB Output is correct
50 Correct 5 ms 348 KB Output is correct
51 Correct 3 ms 580 KB Output is correct
52 Correct 6 ms 348 KB Output is correct

Subtask #4
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 2 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 6 ms 348 KB Output is correct
35 Correct 7 ms 348 KB Output is correct
36 Correct 6 ms 348 KB Output is correct
37 Correct 6 ms 348 KB Output is correct
38 Correct 4 ms 348 KB Output is correct
39 Correct 4 ms 348 KB Output is correct
40 Correct 4 ms 348 KB Output is correct
41 Correct 4 ms 348 KB Output is correct
42 Correct 5 ms 348 KB Output is correct
43 Correct 5 ms 348 KB Output is correct
44 Correct 5 ms 440 KB Output is correct
45 Correct 5 ms 348 KB Output is correct
46 Correct 7 ms 576 KB Output is correct
47 Correct 4 ms 348 KB Output is correct
48 Correct 4 ms 436 KB Output is correct
49 Correct 3 ms 348 KB Output is correct
50 Correct 5 ms 348 KB Output is correct
51 Correct 3 ms 580 KB Output is correct
52 Correct 6 ms 348 KB Output is correct
53 Correct 1002 ms 14744 KB Output is correct
54 Correct 946 ms 14692 KB Output is correct
55 Correct 936 ms 14240 KB Output is correct
56 Correct 880 ms 14344 KB Output is correct
57 Correct 770 ms 15496 KB Output is correct
58 Correct 756 ms 14712 KB Output is correct
59 Correct 731 ms 14328 KB Output is correct
60 Correct 818 ms 14892 KB Output is correct
61 Correct 913 ms 15336 KB Output is correct
62 Correct 826 ms 14452 KB Output is correct
63 Correct 871 ms 14528 KB Output is correct
64 Correct 782 ms 15056 KB Output is correct
65 Correct 859 ms 14096 KB Output is correct
66 Correct 795 ms 14196 KB Output is correct
67 Correct 887 ms 15292 KB Output is correct
68 Correct 586 ms 14228 KB Output is correct
69 Correct 763 ms 15568 KB Output is correct
70 Correct 715 ms 14740 KB Output is correct
71 Correct 867 ms 14744 KB Output is correct
72 Correct 651 ms 15428 KB Output is correct
73 Correct 1030 ms 14724 KB Output is correct