Submission #1076963

#	Time	Username	Problem	Language	Result	Execution time	Memory
1076963		ArthuroWich	Parachute rings (IOI12_rings)	C++17	0 / 100	4064 ms	10076 KiB

rings

#include<bits/stdc++.h>
using namespace std;
vector<int> adj[200005], vis;
int n, ans = 0;
bool f = 1;
void Init(int N_) {
    n = N_;
    ans = n;
}
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;
}
void Link(int A, int B) {
    adj[A].push_back(B);
    adj[B].push_back(A);
    ans = 0;
    for (int i = 0; i < n; i++) {
        ans += calc(i);
    }
}
int CountCritical() {
    return ans;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 17
• Subtask 3: 0 / 18
• Subtask 4: 0 / 14
• Subtask 5: 0 / 31