Submission #483183

#	Time	Username	Problem	Language	Result	Execution time	Memory
483183		abc864197532	Parachute rings (IOI12_rings)	C++17	20 / 100	4088 ms	15300 KiB

rings

#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define X first
#define Y second
#define pii pair<int, int>
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T i, U ...j) {
    cout << i << ' ', abc(j...);
}
template <typename T> void printv(T l, T r) {
    for (; l != r; ++l) cout << *l << " \n"[l + 1 == r];
}
#ifdef Doludu
#define test(args...) abc("[" + string(#args) + "]", args);
#include "grader_B.cpp"
#else
#define test(args...) void(0);
#endif
const int N = 1000000;

vector <pii> edge;
int n, dsu[N];

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

void Init(int N) {
    n = N;
}

void Link(int a, int b) {
    edge.eb(a, b);
}

int check(int x) {
    iota(dsu, dsu + n, 0);
    vector <int> deg(n, 0);
    for (pii e : edge) if (e.X != x && e.Y != x) {
        if (Find(e.X) == Find(e.Y))
            return false;
        dsu[Find(e.X)] = Find(e.Y);
        deg[e.X]++, deg[e.Y]++;
    }
    for (int i = 0; i < n; ++i) if (deg[i] > 2)
        return false;
    return true;
}

int CountCritical() {
    int ans = 0;
    for (int i = 0; i < n; ++i) if (check(i)) {
        ans++;
    }
    return ans;
}

/*
7 13
-1
1 2
-1
0 5
-1
2 0
-1
3 2
-1
3 5
-1
4 3
-1
*/

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