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Submission #1077006

# Submission time Handle Problem Language Result Execution time Memory
1077006 2024-08-26T20:31:52 Z ArthuroWich Parachute rings (IOI12_rings) C++17
38 / 100
 4000 ms 79952 KB 
#include<bits/stdc++.h>
using namespace std;
vector<int> adj[1000005], vis;
int n, ans = 0, p[1000005], s[1000005];
bool f = 1;
int find(int x) {
    if (p[x] == x) {
        return x;
    }
    p[x] = find(p[x]);
    return p[x];
}
void merge(int a, int b) {
    a = find(a);
    b = find(b);
    if (a == b) {
        return;
    }
    if (s[b] > s[a]) {
        swap(a, b);
    }
    s[a] += s[b];
    p[b] = a;
}
void Init(int N_) {
    n = N_;
    ans = n;
    for (int i = 0; i < n; i++) {
        p[i] = i;
        s[i] = 1;
    }
}
void dfs(int i, int p, int s) {
    if (vis[i]) {
        f = 0;
        return;
    }
    vis[i] = 1;
    for (int j : adj[i]) {
        if (j == p || j == s) {
            continue;
        }
        dfs(j, i, s);
    }
}
int calc(int a) {
    vis.resize(n, 0);
    vector<int> co(n, 0);
    for (int j : adj[a]) {
        co[j]++;
    }
    f = 1;
    for (int i = 0; i < n; i++) {
        if (i != a && adj[i].size()-co[i] > 2) {
            f = 0;
            break;
        }
        if (vis[i] || i == a) {
            continue;
        }
        dfs(i, -1, a);
    }
    vis.clear();
    return f;
}
int le = -1, pre[1000005];
void dfscyc(int i, int p) {
    if (le != -1) {
        return;
    }
    if (vis[i]) {
        pre[i] = p;
        int a = i;
        le = 0;
        a = pre[a];
        le += calc(a);
        while(a != i) {
            a = pre[a];
            le += calc(a);
        }
        return;
    }
    vis[i] = 1;
    pre[i] = p;
    for (int j : adj[i]) {
        if (j == p) {
            continue;
        }
        dfscyc(j, i);
    }
}
int cycle(int a) {
    vis.resize(n, 0);
    le = -1;
    dfscyc(a, 0);
    vis.clear();
    if (le == -1) {
        le = 0;
    }
    return le;
}
bool cyc = 0, cant = 0;
int s4 = -1;
void Link(int A, int B) {
    adj[A].push_back(B);
    adj[B].push_back(A);
    if (cant) {
        return;
    }
    if (find(A) == find(B)) {
        ans = cycle(A);
    }
    if (find(A) != find(B)) {
        merge(A, B);
    }
    if (adj[A].size() >= 4 && s4 == -1) {
        s4 = A;
        ans = calc(A);
    }
    if (adj[B].size() >= 4 && s4 == -1) {
        s4 = B;
        ans = calc(B);
    }
    if (adj[A].size() >= 4 && s4 != -1 && s4 != A) {
        ans = 0;
        cant = 1;
        return;
    }
    if (adj[B].size() >= 4 && s4 != -1 && s4 != B) {
        ans = 0;
        cant = 1;
        return;
    }
    if (adj[A].size() == 3) {
        ans = calc(A);
        for (int j : adj[A]) {
            ans += calc(j);
        }
        if (ans == 0) {
            cant = 1;
            return;
        }
    }
    if (adj[B].size() == 3) {
        ans = calc(B);
        for (int j : adj[B]) {
            ans += calc(j);
        }
        if (ans == 0) {
            cant = 1;
            return;
        }
    }
}
int CountCritical() {
    return ans;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 23900 KB Output is correct
2 Correct 13 ms 24204 KB Output is correct
3 Correct 13 ms 24156 KB Output is correct
4 Correct 11 ms 23848 KB Output is correct
5 Correct 69 ms 24156 KB Output is correct
6 Correct 263 ms 24408 KB Output is correct
7 Correct 11 ms 23896 KB Output is correct
8 Correct 191 ms 24152 KB Output is correct
9 Correct 12 ms 24156 KB Output is correct
10 Correct 12 ms 24156 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 214 ms 47956 KB Output is correct
2 Correct 643 ms 63940 KB Output is correct
3 Correct 471 ms 69532 KB Output is correct
4 Execution timed out 4075 ms 79952 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 23900 KB Output is correct
2 Correct 13 ms 24204 KB Output is correct
3 Correct 13 ms 24156 KB Output is correct
4 Correct 11 ms 23848 KB Output is correct
5 Correct 69 ms 24156 KB Output is correct
6 Correct 263 ms 24408 KB Output is correct
7 Correct 11 ms 23896 KB Output is correct
8 Correct 191 ms 24152 KB Output is correct
9 Correct 12 ms 24156 KB Output is correct
10 Correct 12 ms 24156 KB Output is correct
11 Correct 14 ms 24152 KB Output is correct
12 Correct 44 ms 24512 KB Output is correct
13 Correct 27 ms 24496 KB Output is correct
14 Correct 816 ms 24396 KB Output is correct
15 Correct 984 ms 24756 KB Output is correct
16 Correct 2169 ms 24568 KB Output is correct
17 Correct 15 ms 24360 KB Output is correct
18 Correct 14 ms 24668 KB Output is correct
19 Correct 87 ms 24608 KB Output is correct
20 Correct 14 ms 24412 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 23900 KB Output is correct
2 Correct 13 ms 24204 KB Output is correct
3 Correct 13 ms 24156 KB Output is correct
4 Correct 11 ms 23848 KB Output is correct
5 Correct 69 ms 24156 KB Output is correct
6 Correct 263 ms 24408 KB Output is correct
7 Correct 11 ms 23896 KB Output is correct
8 Correct 191 ms 24152 KB Output is correct
9 Correct 12 ms 24156 KB Output is correct
10 Correct 12 ms 24156 KB Output is correct
11 Correct 14 ms 24152 KB Output is correct
12 Correct 44 ms 24512 KB Output is correct
13 Correct 27 ms 24496 KB Output is correct
14 Correct 816 ms 24396 KB Output is correct
15 Correct 984 ms 24756 KB Output is correct
16 Correct 2169 ms 24568 KB Output is correct
17 Correct 15 ms 24360 KB Output is correct
18 Correct 14 ms 24668 KB Output is correct
19 Correct 87 ms 24608 KB Output is correct
20 Correct 14 ms 24412 KB Output is correct
21 Correct 22 ms 25680 KB Output is correct
22 Correct 31 ms 26708 KB Output is correct
23 Correct 33 ms 27480 KB Output is correct
24 Execution timed out 4059 ms 27436 KB Time limit exceeded
25 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 23900 KB Output is correct
2 Correct 13 ms 24204 KB Output is correct
3 Correct 13 ms 24156 KB Output is correct
4 Correct 11 ms 23848 KB Output is correct
5 Correct 69 ms 24156 KB Output is correct
6 Correct 263 ms 24408 KB Output is correct
7 Correct 11 ms 23896 KB Output is correct
8 Correct 191 ms 24152 KB Output is correct
9 Correct 12 ms 24156 KB Output is correct
10 Correct 12 ms 24156 KB Output is correct
11 Correct 214 ms 47956 KB Output is correct
12 Correct 643 ms 63940 KB Output is correct
13 Correct 471 ms 69532 KB Output is correct
14 Execution timed out 4075 ms 79952 KB Time limit exceeded
15 Halted 0 ms 0 KB -