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Submission #1027121

# Submission time Handle Problem Language Result Execution time Memory
1027121 2024-07-18T22:44:21 Z 12345678 Love Polygon (BOI18_polygon) C++17
100 / 100
 205 ms 32984 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5;

int n, t, vs[nx], res, cnt, l[nx], c[nx], used[nx];
string su[nx], sv[nx];
map<string, int> mp;
vector<int> d[nx], cy[nx];

int dfs(int u, int rt)
{
    vs[u]=1;
    for (auto v:d[u]) if (v==rt||(!vs[v]&&dfs(v, rt))) return c[u]=cnt, cy[cnt].push_back(u), 1;
    return 0;
}

void dfstree(int u, int p)
{
    for (auto v:d[u]) if (c[v]==-1) dfstree(v, u);
    if (u!=p&&!used[u]&&!used[p]) res++, used[u]=used[p]=1;
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    for (int i=1; i<=n; i++) cin>>su[i]>>sv[i], mp[su[i]]=i, c[i]=-1;
    if (n%2) return cout<<-1, 0;
    for (int i=1; i<=n; i++) 
    {
        l[mp[su[i]]]=mp[sv[i]];
        if (mp[su[i]]!=mp[sv[i]]) d[mp[sv[i]]].push_back(mp[su[i]]);
        else cy[cnt++].push_back(i);
    }
    for (int i=1; i<=n; i++) if (!vs[i]&&dfs(i, i)) cnt++;
    for (int i=0; i<cnt; i++) 
    {
        if (cy[i].size()==2) res+=2, used[cy[i][0]]=used[cy[i][1]]=1;
        int cnt=0;
        for (auto x:cy[i]) dfstree(x, x), cnt+=(!used[x]);
        if (cnt==cy[i].size())
        {
            if (cy[i].size()==2) res+=2;
            else res+=cy[i].size()/2; 
        }
        for (auto x:cy[i])
        {
            if (used[x]&&!used[l[x]])
            {
                int tmp=l[x], sz=1;
                while (!used[l[tmp]]) sz++, tmp=l[tmp];
                res+=sz/2;
            }
        }
    }
    cout<<n-res;
}

Compilation message

polygon.cpp: In function 'int main()':
polygon.cpp:43:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         if (cnt==cy[i].size())
      |             ~~~^~~~~~~~~~~~~~

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12892 KB Output is correct
2 Correct 2 ms 12892 KB Output is correct
3 Correct 2 ms 12892 KB Output is correct
4 Correct 2 ms 12908 KB Output is correct
5 Correct 2 ms 12892 KB Output is correct
6 Correct 2 ms 12892 KB Output is correct
7 Correct 2 ms 12892 KB Output is correct
8 Correct 2 ms 12892 KB Output is correct
9 Correct 2 ms 12944 KB Output is correct
10 Correct 2 ms 12892 KB Output is correct
11 Correct 2 ms 12892 KB Output is correct
12 Correct 2 ms 12892 KB Output is correct
13 Correct 2 ms 12940 KB Output is correct
14 Correct 2 ms 12892 KB Output is correct
15 Correct 2 ms 12892 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12892 KB Output is correct
2 Correct 2 ms 12892 KB Output is correct
3 Correct 2 ms 12892 KB Output is correct
4 Correct 199 ms 32044 KB Output is correct
5 Correct 177 ms 26704 KB Output is correct
6 Correct 168 ms 32980 KB Output is correct
7 Correct 53 ms 22864 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 167 ms 25172 KB Output is correct
2 Correct 169 ms 26964 KB Output is correct
3 Correct 132 ms 25940 KB Output is correct
4 Correct 50 ms 22864 KB Output is correct
5 Correct 181 ms 31760 KB Output is correct
6 Correct 169 ms 24400 KB Output is correct
7 Correct 166 ms 24516 KB Output is correct
8 Correct 162 ms 25680 KB Output is correct
9 Correct 165 ms 23996 KB Output is correct
10 Correct 120 ms 23504 KB Output is correct
11 Correct 2 ms 12892 KB Output is correct
12 Correct 2 ms 12892 KB Output is correct
13 Correct 2 ms 12892 KB Output is correct
14 Correct 2 ms 12888 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12892 KB Output is correct
2 Correct 2 ms 12892 KB Output is correct
3 Correct 2 ms 12892 KB Output is correct
4 Correct 2 ms 12908 KB Output is correct
5 Correct 2 ms 12892 KB Output is correct
6 Correct 2 ms 12892 KB Output is correct
7 Correct 2 ms 12892 KB Output is correct
8 Correct 2 ms 12892 KB Output is correct
9 Correct 2 ms 12944 KB Output is correct
10 Correct 2 ms 12892 KB Output is correct
11 Correct 2 ms 12892 KB Output is correct
12 Correct 2 ms 12892 KB Output is correct
13 Correct 2 ms 12940 KB Output is correct
14 Correct 2 ms 12892 KB Output is correct
15 Correct 2 ms 12892 KB Output is correct
16 Correct 3 ms 12892 KB Output is correct
17 Correct 2 ms 12892 KB Output is correct
18 Correct 2 ms 12892 KB Output is correct
19 Correct 199 ms 32044 KB Output is correct
20 Correct 177 ms 26704 KB Output is correct
21 Correct 168 ms 32980 KB Output is correct
22 Correct 53 ms 22864 KB Output is correct
23 Correct 167 ms 25172 KB Output is correct
24 Correct 169 ms 26964 KB Output is correct
25 Correct 132 ms 25940 KB Output is correct
26 Correct 50 ms 22864 KB Output is correct
27 Correct 181 ms 31760 KB Output is correct
28 Correct 169 ms 24400 KB Output is correct
29 Correct 166 ms 24516 KB Output is correct
30 Correct 162 ms 25680 KB Output is correct
31 Correct 165 ms 23996 KB Output is correct
32 Correct 120 ms 23504 KB Output is correct
33 Correct 2 ms 12892 KB Output is correct
34 Correct 2 ms 12892 KB Output is correct
35 Correct 2 ms 12892 KB Output is correct
36 Correct 2 ms 12888 KB Output is correct
37 Correct 204 ms 25732 KB Output is correct
38 Correct 181 ms 25940 KB Output is correct
39 Correct 177 ms 24848 KB Output is correct
40 Correct 169 ms 24404 KB Output is correct
41 Correct 162 ms 24492 KB Output is correct
42 Correct 184 ms 25012 KB Output is correct
43 Correct 173 ms 24872 KB Output is correct
44 Correct 168 ms 24912 KB Output is correct
45 Correct 168 ms 24916 KB Output is correct
46 Correct 160 ms 24968 KB Output is correct
47 Correct 159 ms 23988 KB Output is correct
48 Correct 179 ms 25172 KB Output is correct
49 Correct 170 ms 26964 KB Output is correct
50 Correct 120 ms 25944 KB Output is correct
51 Correct 53 ms 22868 KB Output is correct
52 Correct 183 ms 31828 KB Output is correct
53 Correct 166 ms 24340 KB Output is correct
54 Correct 169 ms 24404 KB Output is correct
55 Correct 153 ms 25684 KB Output is correct
56 Correct 177 ms 23892 KB Output is correct
57 Correct 124 ms 23360 KB Output is correct
58 Correct 2 ms 12892 KB Output is correct
59 Correct 2 ms 12892 KB Output is correct
60 Correct 2 ms 12892 KB Output is correct
61 Correct 2 ms 12892 KB Output is correct
62 Correct 2 ms 12708 KB Output is correct
63 Correct 2 ms 12892 KB Output is correct
64 Correct 2 ms 12892 KB Output is correct
65 Correct 205 ms 32020 KB Output is correct
66 Correct 183 ms 26708 KB Output is correct
67 Correct 193 ms 32984 KB Output is correct
68 Correct 52 ms 23120 KB Output is correct
69 Correct 2 ms 12892 KB Output is correct
70 Correct 2 ms 12892 KB Output is correct
71 Correct 2 ms 12892 KB Output is correct
72 Correct 2 ms 12892 KB Output is correct
73 Correct 2 ms 12804 KB Output is correct
74 Correct 2 ms 12892 KB Output is correct
75 Correct 2 ms 12892 KB Output is correct
76 Correct 2 ms 12944 KB Output is correct
77 Correct 2 ms 12892 KB Output is correct
78 Correct 2 ms 12940 KB Output is correct
79 Correct 2 ms 12892 KB Output is correct
80 Correct 2 ms 12892 KB Output is correct
81 Correct 2 ms 12892 KB Output is correct
82 Correct 2 ms 12892 KB Output is correct
83 Correct 2 ms 12892 KB Output is correct