oj.uz

답안 #568369

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
568369 2022-05-25T09:28:45 Z cheissmart 낙하산 고리들 (IOI12_rings) C++14
0 / 100
 959 ms 72724 KB 
#include <bits/stdc++.h>
#define IO_OP ios::sync_with_stdio(0), cin.tie(0)
#define F first
#define S second
#define V vector
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define SZ(v) int((v).size())
#define ALL(v) (v).begin(), (v).end()
 
using namespace std;
 
typedef long long ll;
typedef pair<int, int> pi;
typedef V<int> vi;
 
const int INF = 1e9 + 7, N = 1e6 + 7;
 
int n;
int p[N], sz[N], esz[N];
bool not_in[N], intered = false;
vi g[N], s;

int answer;

int qry();

void Init(int _n) {
    n = _n;
    for(int i = 0; i < n; i++) {
        p[i] = i;
        sz[i] = 1;
        s.PB(i);
    }
    answer = qry();
}
 
int find(int u) {
    return p[u] == u ? u : p[u] = find(p[u]);
}
 
void unite(int u, int v) {
    u = find(u), v = find(v);
    assert(u != v);
    if(sz[u] > sz[v]) swap(u, v);
    p[u] = v;
    sz[v] += sz[u];
    esz[v] += esz[u];
}
 
V<pi> tt;
int cc = 0, bad_cnt = 0, any_cycle = -1;
 
void inter(vi ss) {
    intered = true;
    vi tmp;
    for(int u:s) if(find(ALL(ss), u) != ss.end())
        tmp.PB(u);
    swap(tmp, s);
}
 
void check(int u) {
    if(SZ(g[u]) <= 2) return;
    bad_cnt++;
    if(SZ(g[u]) > 3)
        inter({u});
    inter({u, g[u][0], g[u][1], g[u][2]});
    if(answer) answer = qry();
}
 
void Link(int u, int v) {
    if(find(u) != find(v)) {
        if(esz[find(u)] >= sz[find(u)]) cc--;
        if(esz[find(v)] >= sz[find(v)]) cc--;
        unite(u, v);
        esz[find(u)]++;
        if(esz[find(u)] >= sz[find(u)]) cc++, any_cycle = u;
    } else {
        if(esz[find(u)] >= sz[find(u)]) cc--;
        esz[find(u)]++;
        if(esz[find(u)] >= sz[find(u)]) cc++, any_cycle = u;
    }
    g[u].PB(v);
    g[v].PB(u);
    check(u), check(v);
}
 
bool ok(int u) {
    // if(SZ(tt) > 2) return false;
    // if(not_in[u]) return false;
    // return true;
    V<bool> vis(n);
    bool has_cycle = false;
    function<void(int, int)> dfs = [&] (int x, int pa) {
        vis[x] = true;
        for(int y:g[x]) if(y != pa && y != u) {
            if(vis[y]) has_cycle = true;
            else dfs(y, x);
        }
    };
    for(int i = 0; i < n; i++) if(!vis[i] && i != u)
        dfs(i, -1);
    return !has_cycle;
}
 
int qry() {
    if(cc > 1) return 0;
    if(s.empty()) return 0;
    if(cc == 0) return SZ(s);
    if(!intered) return sz[find(any_cycle)];
    if(esz[find(s[0])] < sz[find(s[0])]) return 0;
    if(bad_cnt == 1) {
        if(SZ(s) == 1) return 1;
        return 3;
    }
    int ans = 0;
    for(int u:s) {
        if(ok(u)) ans++;
    }
    return ans;
}

int CountCritical() {
    return answer;
}

Subtask #1
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 14 ms 23996 KB Output is correct
3 Correct 15 ms 24004 KB Output is correct
4 Incorrect 13 ms 23860 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 354 ms 49968 KB Output is correct
2 Correct 748 ms 59884 KB Output is correct
3 Correct 911 ms 64824 KB Output is correct
4 Incorrect 959 ms 72724 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 14 ms 23996 KB Output is correct
3 Correct 15 ms 24004 KB Output is correct
4 Incorrect 13 ms 23860 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 14 ms 23996 KB Output is correct
3 Correct 15 ms 24004 KB Output is correct
4 Incorrect 13 ms 23860 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 14 ms 23996 KB Output is correct
3 Correct 15 ms 24004 KB Output is correct
4 Incorrect 13 ms 23860 KB Output isn't correct
5 Halted 0 ms 0 KB -