oj.uz

답안 #486984

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
486984 2021-11-13T17:21:54 Z model_code Logičari (COCI21_logicari) C++17
110 / 110
 198 ms 26980 KB 
#include<bits/stdc++.h>

using namespace std;

typedef long long llint;
typedef pair <int, int> pi;

const int MAXN = 100005;
const int INF = 1000000007;

int n, root, special;
int head[MAXN], par[MAXN];
int dp[MAXN][2][2][2][2];
vector <int> v[MAXN];

int nadi (int x) {
    if (x == head[x]) return x;
    return head[x] = nadi(head[x]);
}

void dfs (int x, int rod) {
    par[x] = rod;
    for (auto sus : v[x]) {
        if (sus == rod) continue;
        dfs(sus, x);
    }
}

int calc (int x, int me, int up, int rt, int sp) {
    if (dp[x][me][up][rt][sp] != -1) return dp[x][me][up][rt][sp];

    llint res = INF;

    bool ok = 1;
    if (x == root && me != rt) ok = 0;
    if (x == special && me != sp) ok = 0;
    if (x == special && up && rt) ok = 0;
    if (!ok) return dp[x][me][up][rt][sp] = INF;

    bool covered = 0;
    if (up) covered = 1;
    if (x == root && sp) covered = 1;
    if (x == special && rt) covered = 1;

    llint sum = me;
    for (auto sus : v[x]) {
        if (sus == par[x]) continue;
        sum += calc(sus, 0, me, rt, sp);
    }

    if (covered) {
        res = min(res, sum);
    } else {
        for (auto sus : v[x]) {
            if (sus == par[x]) continue;
            llint val = sum - calc(sus, 0, me, rt, sp) + calc(sus, 1, me, rt, sp);
            res = min(res, val);
        }
    }

    return dp[x][me][up][rt][sp] = res;
}

void solve () {
    int sol = INF;
    for (int rt = 0; rt <= 1; rt++) {
        for (int sp = 0; sp <= 1; sp++) {
            sol = min(sol, calc(root, rt, 0, rt, sp));
        }
    }
    if (sol == INF) cout << -1; else cout << sol;
}

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    memset(dp, -1, sizeof dp);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        head[i] = i;
    }
    for (int i = 0; i < n; i++) {
        int a, b;
        cin >> a >> b;
        int pa = nadi(a);
        int pb = nadi(b);
        if (pa == pb) {
            root = a;
            special = b;
        } else {
            head[pa] = pb;
            v[a].push_back(b);
            v[b].push_back(a);
        }
    }
    dfs(root, 0);
    solve();
    return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 8908 KB Output is correct
2 Correct 3 ms 8908 KB Output is correct
3 Correct 3 ms 8908 KB Output is correct
4 Correct 4 ms 8908 KB Output is correct
5 Correct 162 ms 26900 KB Output is correct
6 Correct 186 ms 26904 KB Output is correct
7 Correct 198 ms 26924 KB Output is correct
8 Correct 160 ms 26908 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 8908 KB Output is correct
2 Correct 3 ms 8908 KB Output is correct
3 Correct 3 ms 8908 KB Output is correct
4 Correct 4 ms 8908 KB Output is correct
5 Correct 6 ms 8892 KB Output is correct
6 Correct 5 ms 8908 KB Output is correct
7 Correct 5 ms 8908 KB Output is correct
8 Correct 4 ms 8908 KB Output is correct
9 Correct 6 ms 8908 KB Output is correct
10 Correct 4 ms 8908 KB Output is correct
11 Correct 4 ms 8908 KB Output is correct
12 Correct 3 ms 8908 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 8908 KB Output is correct
2 Correct 3 ms 8908 KB Output is correct
3 Correct 3 ms 8908 KB Output is correct
4 Correct 4 ms 8908 KB Output is correct
5 Correct 6 ms 8892 KB Output is correct
6 Correct 5 ms 8908 KB Output is correct
7 Correct 5 ms 8908 KB Output is correct
8 Correct 4 ms 8908 KB Output is correct
9 Correct 6 ms 8908 KB Output is correct
10 Correct 4 ms 8908 KB Output is correct
11 Correct 4 ms 8908 KB Output is correct
12 Correct 3 ms 8908 KB Output is correct
13 Correct 4 ms 8908 KB Output is correct
14 Correct 4 ms 8908 KB Output is correct
15 Correct 4 ms 8908 KB Output is correct
16 Correct 5 ms 8908 KB Output is correct
17 Correct 4 ms 8908 KB Output is correct
18 Correct 6 ms 8908 KB Output is correct
19 Correct 4 ms 8908 KB Output is correct
20 Correct 4 ms 8908 KB Output is correct
21 Correct 4 ms 8908 KB Output is correct
22 Correct 4 ms 8908 KB Output is correct
23 Correct 5 ms 9048 KB Output is correct
24 Correct 6 ms 9036 KB Output is correct

Subtask #4
50.0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 8908 KB Output is correct
2 Correct 3 ms 8908 KB Output is correct
3 Correct 3 ms 8908 KB Output is correct
4 Correct 4 ms 8908 KB Output is correct
5 Correct 162 ms 26900 KB Output is correct
6 Correct 186 ms 26904 KB Output is correct
7 Correct 198 ms 26924 KB Output is correct
8 Correct 160 ms 26908 KB Output is correct
9 Correct 3 ms 8908 KB Output is correct
10 Correct 3 ms 8908 KB Output is correct
11 Correct 3 ms 8908 KB Output is correct
12 Correct 4 ms 8908 KB Output is correct
13 Correct 6 ms 8892 KB Output is correct
14 Correct 5 ms 8908 KB Output is correct
15 Correct 5 ms 8908 KB Output is correct
16 Correct 4 ms 8908 KB Output is correct
17 Correct 6 ms 8908 KB Output is correct
18 Correct 4 ms 8908 KB Output is correct
19 Correct 4 ms 8908 KB Output is correct
20 Correct 3 ms 8908 KB Output is correct
21 Correct 4 ms 8908 KB Output is correct
22 Correct 4 ms 8908 KB Output is correct
23 Correct 4 ms 8908 KB Output is correct
24 Correct 5 ms 8908 KB Output is correct
25 Correct 4 ms 8908 KB Output is correct
26 Correct 6 ms 8908 KB Output is correct
27 Correct 4 ms 8908 KB Output is correct
28 Correct 4 ms 8908 KB Output is correct
29 Correct 4 ms 8908 KB Output is correct
30 Correct 4 ms 8908 KB Output is correct
31 Correct 5 ms 9048 KB Output is correct
32 Correct 6 ms 9036 KB Output is correct
33 Correct 109 ms 12444 KB Output is correct
34 Correct 110 ms 12432 KB Output is correct
35 Correct 95 ms 12412 KB Output is correct
36 Correct 97 ms 12444 KB Output is correct
37 Correct 23 ms 9832 KB Output is correct
38 Correct 103 ms 12632 KB Output is correct
39 Correct 9 ms 9164 KB Output is correct
40 Correct 106 ms 12356 KB Output is correct
41 Correct 60 ms 13476 KB Output is correct
42 Correct 75 ms 13192 KB Output is correct
43 Correct 129 ms 26980 KB Output is correct
44 Correct 140 ms 19972 KB Output is correct