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Submission #391688

# Submission time Handle Problem Language Result Execution time Memory
391688 2021-04-19T14:37:45 Z Victor Love Polygon (BOI18_polygon) C++17
100 / 100
 309 ms 46188 KB 
#include <bits/stdc++.h>
using namespace std;
#define rep(i, a, b) for (int i = a; i < b; ++i)
#define per(i, a, b) for (int i = b - 1; i >= a; --i)
#define trav(a, x) for (auto& a : x)
#define sz(a) a.size()
#define umap unordered_map
#define uset unordered_set

typedef pair<int, int> ii;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;

umap<string, string> out;
umap<string, int> in;
uset<string> unloved, vis;

int ans = 0, n;

void remove(string name) {
    if (in.count(out[name]) && 1 == in[out[name]]--) unloved.insert(out[name]);
    out.erase(name);
    in.erase(name);
}

int si;
void dfs(string person) {
    if (vis.count(person)) return;
    vis.insert(person);
    ++si;
    if(out.count(out[person]))
    dfs(out[person]);
}

int main() {
    cin.tie(0)->sync_with_stdio(0);

    cin >> n;
    if (n & 1) {
        cout << -1 << endl;
        return 0;
    }

    string n1, n2;
    vector<string> arr(n * 2);
    rep(i, 0, n) {
        cin >> arr[i] >> arr[i + n];
        out.emplace(arr[i], arr[i + n]);
        in.emplace(arr[i], 0);
    }

    vector<string> rem;
    rep(i, 0, n) {
        n1 = arr[i];
        n2 = arr[i + n];
        if (n1 == n2) continue;
        if (out[n2] == n1) rem.push_back(n1);
        ++in[n2];
    }

    trav(name, rem) {
        out.erase(name);
        in.erase(name);
    }

    trav(person, in) if (!person.second) unloved.insert(person.first);

    while (!unloved.empty()) {
        string name = *unloved.begin();
        unloved.erase(unloved.begin());

        if (!out.count(name) || !out.count(out[name])) continue;

        ++ans;
        remove(out[name]);
        out.erase(name);
        in.erase(name);
    }

    trav(person,out){
        si=0;
        dfs(person.first);
        ans+=(si+1)>>1;
    }

    cout << ans << endl;
}

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 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 1 ms 204 KB Output is correct
12 Correct 1 ms 312 KB Output is correct
13 Correct 1 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 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 309 ms 42272 KB Output is correct
5 Correct 290 ms 30512 KB Output is correct
6 Correct 308 ms 43928 KB Output is correct
7 Correct 1 ms 204 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 278 ms 26128 KB Output is correct
2 Correct 278 ms 25244 KB Output is correct
3 Correct 204 ms 31396 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 240 ms 24208 KB Output is correct
6 Correct 287 ms 27824 KB Output is correct
7 Correct 287 ms 27832 KB Output is correct
8 Correct 306 ms 29480 KB Output is correct
9 Correct 285 ms 29856 KB Output is correct
10 Correct 242 ms 32512 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 208 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 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 1 ms 204 KB Output is correct
12 Correct 1 ms 312 KB Output is correct
13 Correct 1 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 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 309 ms 42272 KB Output is correct
20 Correct 290 ms 30512 KB Output is correct
21 Correct 308 ms 43928 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 278 ms 26128 KB Output is correct
24 Correct 278 ms 25244 KB Output is correct
25 Correct 204 ms 31396 KB Output is correct
26 Correct 1 ms 204 KB Output is correct
27 Correct 240 ms 24208 KB Output is correct
28 Correct 287 ms 27824 KB Output is correct
29 Correct 287 ms 27832 KB Output is correct
30 Correct 306 ms 29480 KB Output is correct
31 Correct 285 ms 29856 KB Output is correct
32 Correct 242 ms 32512 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 1 ms 208 KB Output is correct
35 Correct 1 ms 204 KB Output is correct
36 Correct 1 ms 204 KB Output is correct
37 Correct 269 ms 27168 KB Output is correct
38 Correct 296 ms 29708 KB Output is correct
39 Correct 275 ms 29584 KB Output is correct
40 Correct 297 ms 29964 KB Output is correct
41 Correct 281 ms 29992 KB Output is correct
42 Correct 275 ms 29172 KB Output is correct
43 Correct 281 ms 29264 KB Output is correct
44 Correct 281 ms 29068 KB Output is correct
45 Correct 290 ms 29112 KB Output is correct
46 Correct 269 ms 29068 KB Output is correct
47 Correct 288 ms 31816 KB Output is correct
48 Correct 267 ms 28148 KB Output is correct
49 Correct 270 ms 27496 KB Output is correct
50 Correct 205 ms 33548 KB Output is correct
51 Correct 1 ms 332 KB Output is correct
52 Correct 219 ms 26376 KB Output is correct
53 Correct 285 ms 30032 KB Output is correct
54 Correct 286 ms 30092 KB Output is correct
55 Correct 259 ms 31628 KB Output is correct
56 Correct 290 ms 31864 KB Output is correct
57 Correct 244 ms 34544 KB Output is correct
58 Correct 1 ms 204 KB Output is correct
59 Correct 1 ms 204 KB Output is correct
60 Correct 1 ms 204 KB Output is correct
61 Correct 1 ms 204 KB Output is correct
62 Correct 1 ms 204 KB Output is correct
63 Correct 1 ms 204 KB Output is correct
64 Correct 1 ms 204 KB Output is correct
65 Correct 297 ms 44556 KB Output is correct
66 Correct 273 ms 32396 KB Output is correct
67 Correct 299 ms 46188 KB Output is correct
68 Correct 1 ms 332 KB Output is correct
69 Correct 1 ms 204 KB Output is correct
70 Correct 1 ms 204 KB Output is correct
71 Correct 1 ms 204 KB Output is correct
72 Correct 1 ms 204 KB Output is correct
73 Correct 1 ms 204 KB Output is correct
74 Correct 1 ms 204 KB Output is correct
75 Correct 1 ms 204 KB Output is correct
76 Correct 1 ms 204 KB Output is correct
77 Correct 1 ms 204 KB Output is correct
78 Correct 1 ms 204 KB Output is correct
79 Correct 1 ms 204 KB Output is correct
80 Correct 1 ms 204 KB Output is correct
81 Correct 1 ms 204 KB Output is correct
82 Correct 1 ms 316 KB Output is correct
83 Correct 1 ms 204 KB Output is correct