oj.uz

Submission #1077007

# Submission time Handle Problem Language Result Execution time Memory
1077007 2024-08-26T20:33:28 Z ArthuroWich Parachute rings (IOI12_rings) C++17
38 / 100
 4000 ms 85332 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 = 1, 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 (cyc && find(A) == find(B)) {
        ans = cycle(A);
    }
    if (find(A) != find(B)) {
        merge(A, B);
    }
    if (adj[A].size() >= 4 && s4 == -1) {
        cyc = 0;
        s4 = A;
        ans = calc(A);
    }
    if (adj[B].size() >= 4 && s4 == -1) {
        cyc = 0;
        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 10 ms 23896 KB Output is correct
2 Correct 12 ms 24156 KB Output is correct
3 Correct 11 ms 24124 KB Output is correct
4 Correct 11 ms 23896 KB Output is correct
5 Correct 71 ms 24156 KB Output is correct
6 Correct 256 ms 24412 KB Output is correct
7 Correct 12 ms 23900 KB Output is correct
8 Correct 191 ms 24248 KB Output is correct
9 Correct 13 ms 24152 KB Output is correct
10 Correct 13 ms 24256 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 227 ms 51132 KB Output is correct
2 Correct 616 ms 68884 KB Output is correct
3 Correct 485 ms 75524 KB Output is correct
4 Execution timed out 4075 ms 85332 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 23896 KB Output is correct
2 Correct 12 ms 24156 KB Output is correct
3 Correct 11 ms 24124 KB Output is correct
4 Correct 11 ms 23896 KB Output is correct
5 Correct 71 ms 24156 KB Output is correct
6 Correct 256 ms 24412 KB Output is correct
7 Correct 12 ms 23900 KB Output is correct
8 Correct 191 ms 24248 KB Output is correct
9 Correct 13 ms 24152 KB Output is correct
10 Correct 13 ms 24256 KB Output is correct
11 Correct 15 ms 24228 KB Output is correct
12 Correct 47 ms 24592 KB Output is correct
13 Correct 30 ms 24412 KB Output is correct
14 Correct 473 ms 24152 KB Output is correct
15 Correct 569 ms 24656 KB Output is correct
16 Correct 2195 ms 24848 KB Output is correct
17 Correct 14 ms 24412 KB Output is correct
18 Correct 14 ms 24548 KB Output is correct
19 Correct 87 ms 24612 KB Output is correct
20 Correct 14 ms 24408 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 23896 KB Output is correct
2 Correct 12 ms 24156 KB Output is correct
3 Correct 11 ms 24124 KB Output is correct
4 Correct 11 ms 23896 KB Output is correct
5 Correct 71 ms 24156 KB Output is correct
6 Correct 256 ms 24412 KB Output is correct
7 Correct 12 ms 23900 KB Output is correct
8 Correct 191 ms 24248 KB Output is correct
9 Correct 13 ms 24152 KB Output is correct
10 Correct 13 ms 24256 KB Output is correct
11 Correct 15 ms 24228 KB Output is correct
12 Correct 47 ms 24592 KB Output is correct
13 Correct 30 ms 24412 KB Output is correct
14 Correct 473 ms 24152 KB Output is correct
15 Correct 569 ms 24656 KB Output is correct
16 Correct 2195 ms 24848 KB Output is correct
17 Correct 14 ms 24412 KB Output is correct
18 Correct 14 ms 24548 KB Output is correct
19 Correct 87 ms 24612 KB Output is correct
20 Correct 14 ms 24408 KB Output is correct
21 Correct 25 ms 25684 KB Output is correct
22 Correct 39 ms 26716 KB Output is correct
23 Correct 36 ms 27460 KB Output is correct
24 Execution timed out 4051 ms 27296 KB Time limit exceeded
25 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 23896 KB Output is correct
2 Correct 12 ms 24156 KB Output is correct
3 Correct 11 ms 24124 KB Output is correct
4 Correct 11 ms 23896 KB Output is correct
5 Correct 71 ms 24156 KB Output is correct
6 Correct 256 ms 24412 KB Output is correct
7 Correct 12 ms 23900 KB Output is correct
8 Correct 191 ms 24248 KB Output is correct
9 Correct 13 ms 24152 KB Output is correct
10 Correct 13 ms 24256 KB Output is correct
11 Correct 227 ms 51132 KB Output is correct
12 Correct 616 ms 68884 KB Output is correct
13 Correct 485 ms 75524 KB Output is correct
14 Execution timed out 4075 ms 85332 KB Time limit exceeded
15 Halted 0 ms 0 KB -