oj.uz

Submission #442534

# Submission time Handle Problem Language Result Execution time Memory
442534 2021-07-08T06:38:52 Z abc864197532 Love Polygon (BOI18_polygon) C++17
75 / 100
 343 ms 36332 KB 
#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define X first
#define Y second
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define pii pair<int, int>
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define test(args...) abc("[" + string(#args) + "]", args)
void abc() {cerr << endl;}
template <typename T, typename ...U> void abc(T a, U ...b) {
    cerr << a << ' ', abc(b...);
}
template <typename T> void printv(T l, T r) {
    while (l != r) cerr << *l << " \n"[++l == r];
}
const int mod = 1e9 + 7, N = 200000;

int dsu[N];

int Find(int x) {
    if (x == dsu[x]) return x;
    return dsu[x] = Find(dsu[x]);
}

bool Union(int u, int v) {
    u = Find(u), v = Find(v);
    if (u == v) return false;
    dsu[u] = v;
    return true;
}

int main () {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, _id = 0;
    cin >> n;
    if (n & 1) return cout << -1 << endl, 0;
    map <string, int> m1;
    auto get = [&](string s) {
        if (m1.count(s)) return m1[s];
        return m1[s] = _id++;
    };
    for (int i = 0; i < n; ++i) dsu[i] = i;
    vector <vector <int>> adj(n);
    vector <int> pt(n);
    string s, t;
    vector <pii> oth;
    for (int i = 0; i < n; ++i) {
        cin >> s >> t;
        int u = get(s), v = get(t);
        pt[u] = v;
        if (Union(u, v)) adj[v].pb(u), adj[u].pb(v);
        else oth.eb(v, u);
    }
    vector <int> cur;
    vector <vector <int>> dp1(n, vector <int>(2, 0));
    vector <vector <int>> dp2(n, vector <int>(2, 0));
    // 0 not choose, 1 choose
    vector <bool> vis(n, false);
    int cnt = 0;
    function<void(int, int, int)> dfs = [&](int v, int pa, int out) {
        cnt++;
        for (int u : adj[v]) if (u != pa) {
            dfs(u, v, out);
            dp1[v][0] += max(dp1[u][0], dp1[u][1]);
            dp2[v][0] += max(dp2[u][0], dp2[u][1]);
        }
        for (int u : adj[v]) if (u != pa && u != out) {
            dp1[v][1] = max(dp1[v][1], dp1[v][0] - max(dp1[u][0], dp1[u][1]) + dp1[u][0] + 1);
            dp2[v][1] = max(dp2[v][1], dp2[v][0] - max(dp2[u][0], dp2[u][1]) + dp2[u][0] + 1);
        }
        if (v == out) dp2[v][1] = -1 << 30;
    };
    int ans = n;
    for (pii A : oth) {
        cnt = 0;
        dfs(A.X, -1, A.Y);
        if (A.X != A.Y) ans -= max({dp1[A.X][0], dp1[A.X][1], dp2[A.X][0] + (pt[A.X] == A.Y && pt[A.Y] == A.X ? 2 : 1)});
        else ans -= max(dp1[A.X][0], dp1[A.X][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 0 ms 204 KB Output is correct
3 Correct 1 ms 232 KB Output is correct
4 Correct 0 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 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 320 KB Output is correct
11 Correct 1 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 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 0 ms 204 KB Output is correct
4 Correct 316 ms 34804 KB Output is correct
5 Correct 301 ms 25408 KB Output is correct
6 Correct 343 ms 36332 KB Output is correct
7 Correct 0 ms 204 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 290 ms 25352 KB Output is correct
2 Correct 320 ms 27676 KB Output is correct
3 Correct 170 ms 22920 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 326 ms 35484 KB Output is correct
6 Correct 305 ms 25412 KB Output is correct
7 Correct 343 ms 25388 KB Output is correct
8 Correct 266 ms 24904 KB Output is correct
9 Correct 258 ms 25580 KB Output is correct
10 Correct 179 ms 25668 KB Output is correct
11 Correct 1 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 1 ms 204 KB Output is correct

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 232 KB Output is correct
4 Correct 0 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 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 320 KB Output is correct
11 Correct 1 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 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 0 ms 204 KB Output is correct
19 Correct 316 ms 34804 KB Output is correct
20 Correct 301 ms 25408 KB Output is correct
21 Correct 343 ms 36332 KB Output is correct
22 Correct 0 ms 204 KB Output is correct
23 Correct 290 ms 25352 KB Output is correct
24 Correct 320 ms 27676 KB Output is correct
25 Correct 170 ms 22920 KB Output is correct
26 Correct 1 ms 204 KB Output is correct
27 Correct 326 ms 35484 KB Output is correct
28 Correct 305 ms 25412 KB Output is correct
29 Correct 343 ms 25388 KB Output is correct
30 Correct 266 ms 24904 KB Output is correct
31 Correct 258 ms 25580 KB Output is correct
32 Correct 179 ms 25668 KB Output is correct
33 Correct 1 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 1 ms 204 KB Output is correct
37 Correct 335 ms 27616 KB Output is correct
38 Correct 288 ms 29372 KB Output is correct
39 Incorrect 313 ms 27644 KB Output isn't correct
40 Halted 0 ms 0 KB -