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Submission #446503

# Submission time Handle Problem Language Result Execution time Memory
446503 2021-07-22T08:17:24 Z prvocislo Love Polygon (BOI18_polygon) C++17
100 / 100
 224 ms 12108 KB 
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
 
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    if (n%2)
    {
        cout << "-1" << endl;
        return 0; 
    }
    map<string, int> m;
    vector<int> il(n, -1), lm(n, 0), happy(n, 0); // koho ja lubim, kolko postav lubi mna?
    int cnt = 0;
    for (int i = 0; i < n; i++)
    {
        string a, b;
        cin >> a >> b;
        if (!m.count(a)) m[a] = cnt++;
        if (!m.count(b)) m[b] = cnt++;
        int ia = m[a], ib = m[b];
        il[ia] = ib, lm[ib]++;
        if (ia != ib && il[ib] == ia) happy[ia] = happy[ib] = true;
    }
    vector<int> stk;
    for (int i = 0; i < n; i++)
        if (lm[i] == 0) stk.push_back(i);
    int ans = 0, alone = 0;
    while (!stk.empty())
    {
        int i = stk.back(); stk.pop_back();
        if (happy[il[i]])
        {
            alone++;
            happy[i] = true;
            continue;
        }
        happy[i] = happy[il[i]] = true;
        ans++;
        if (!happy[il[il[i]]])
        {
            lm[il[il[i]]]--;
            if (!lm[il[il[i]]]) stk.push_back(il[il[i]]);
        }
    }
    for (int i = 0; i < n; i++)
    {
        if (happy[i]) continue;
        int j = il[i], len = 1;
        happy[i] = true;
        while (j != i)
        {
            happy[j] = true;
            len++;
            j = il[j];
        }
        ans += (len>>1), alone += (len&1);
    }
    cout << ans+alone << "\n";
    return 0;
}

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 2 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 210 ms 11452 KB Output is correct
5 Correct 218 ms 11460 KB Output is correct
6 Correct 213 ms 11568 KB Output is correct
7 Correct 1 ms 332 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 221 ms 9428 KB Output is correct
2 Correct 212 ms 9400 KB Output is correct
3 Correct 170 ms 9204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 205 ms 9276 KB Output is correct
6 Correct 210 ms 9624 KB Output is correct
7 Correct 210 ms 9708 KB Output is correct
8 Correct 189 ms 9580 KB Output is correct
9 Correct 192 ms 9928 KB Output is correct
10 Correct 157 ms 9836 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 2 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 210 ms 11452 KB Output is correct
20 Correct 218 ms 11460 KB Output is correct
21 Correct 213 ms 11568 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 221 ms 9428 KB Output is correct
24 Correct 212 ms 9400 KB Output is correct
25 Correct 170 ms 9204 KB Output is correct
26 Correct 0 ms 204 KB Output is correct
27 Correct 205 ms 9276 KB Output is correct
28 Correct 210 ms 9624 KB Output is correct
29 Correct 210 ms 9708 KB Output is correct
30 Correct 189 ms 9580 KB Output is correct
31 Correct 192 ms 9928 KB Output is correct
32 Correct 157 ms 9836 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 0 ms 204 KB Output is correct
35 Correct 0 ms 204 KB Output is correct
36 Correct 0 ms 204 KB Output is correct
37 Correct 215 ms 11612 KB Output is correct
38 Correct 217 ms 11776 KB Output is correct
39 Correct 204 ms 11936 KB Output is correct
40 Correct 214 ms 11856 KB Output is correct
41 Correct 207 ms 11736 KB Output is correct
42 Correct 208 ms 11844 KB Output is correct
43 Correct 212 ms 11740 KB Output is correct
44 Correct 212 ms 11844 KB Output is correct
45 Correct 205 ms 11824 KB Output is correct
46 Correct 211 ms 11852 KB Output is correct
47 Correct 198 ms 12108 KB Output is correct
48 Correct 207 ms 11588 KB Output is correct
49 Correct 224 ms 11488 KB Output is correct
50 Correct 173 ms 11460 KB Output is correct
51 Correct 0 ms 332 KB Output is correct
52 Correct 211 ms 11440 KB Output is correct
53 Correct 209 ms 11832 KB Output is correct
54 Correct 207 ms 11816 KB Output is correct
55 Correct 196 ms 11972 KB Output is correct
56 Correct 192 ms 12052 KB Output is correct
57 Correct 156 ms 12060 KB Output is correct
58 Correct 0 ms 204 KB Output is correct
59 Correct 1 ms 204 KB Output is correct
60 Correct 0 ms 204 KB Output is correct
61 Correct 0 ms 204 KB Output is correct
62 Correct 0 ms 204 KB Output is correct
63 Correct 0 ms 204 KB Output is correct
64 Correct 1 ms 204 KB Output is correct
65 Correct 213 ms 11412 KB Output is correct
66 Correct 209 ms 11368 KB Output is correct
67 Correct 204 ms 11460 KB Output is correct
68 Correct 0 ms 332 KB Output is correct
69 Correct 0 ms 204 KB Output is correct
70 Correct 1 ms 204 KB Output is correct
71 Correct 1 ms 308 KB Output is correct
72 Correct 0 ms 204 KB Output is correct
73 Correct 0 ms 204 KB Output is correct
74 Correct 1 ms 312 KB Output is correct
75 Correct 0 ms 204 KB Output is correct
76 Correct 0 ms 204 KB Output is correct
77 Correct 1 ms 204 KB Output is correct
78 Correct 0 ms 204 KB Output is correct
79 Correct 0 ms 204 KB Output is correct
80 Correct 0 ms 204 KB Output is correct
81 Correct 0 ms 204 KB Output is correct
82 Correct 1 ms 312 KB Output is correct
83 Correct 0 ms 204 KB Output is correct