oj.uz

Submission #389804

# Submission time Handle Problem Language Result Execution time Memory
389804 2021-04-14T14:33:03 Z AmineWeslati Parachute rings (IOI12_rings) C++14
37 / 100
 1580 ms 121140 KB 
//Never stop trying
#include "bits/stdc++.h"
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef long long ll;
typedef string str;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)

const int MOD = 1e9 + 7; //998244353
const ll INF = 1e18;
const int MX = 1e6 + 10;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up

template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
//constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
//mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
ll random(ll a, ll b){
    return a + rng() % (b - a + 1);
}
#ifndef LOCAL  
#define cerr if(false) cerr
#endif
#define dbg(x) cerr << #x << " : " << x << endl; 
#define dbgs(x,y) cerr << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << #v << " : " << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
#define here() cerr << "here" << endl;

void IO() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin); 
    freopen("output.txt", "w", stdout);
#endif
}
/////////////////////////ONLY CLEAN CODES ALLOWED/////////////////////////


int N; 
vi adj[MX],critical,deg(MX,0),cy,p(MX),rnk(MX);


void Init(int N){
	::N=N; 
	FOR(i,0,N){
		p[i]=i,rnk[i]=0;
		critical.pb(i);
	}
}

	
int findSet(int u){
	return p[u]==u ? u : p[u]=findSet(p[u]);
}
void joinSet(int u, int v){
	u=findSet(u),v=findSet(v);
	if(u==v) return; 
	if(rnk[u]<rnk[v]) swap(u,v);
	if(rnk[u]==rnk[v]) rnk[u]++;
	p[v]=u;
}

vi vis(MX,0);
void inter(vi vec){
	for(int x: vec) vis[x]=1;

	vi nw; 
	for(int x: critical) if(vis[x]) 
		nw.pb(x);
	critical.assign(all(nw));

	for(int x: vec) vis[x]=0;
}


vi par;
void dfs(int u){
	for(int v: adj[u]) if(par[v]==-1){
		par[v]=u; 
		dfs(v);
	}
}

void find_cy(int u, int v){
	cy.clear();

	par.assign(N,-1);
	par[u]=u;
	dfs(u);

	while(1){
		cy.pb(v);
		if(v==u) break;
		v=par[v];
	}
}

void Link(int u, int v){
	if(!sz(critical)) return;
	
	deg[u]++; deg[v]++;
	adj[u].pb(v);
	adj[v].pb(u);

	if(deg[u]>=4){
		inter(vi{u});
	}
	else if(deg[v]>=4){
		inter(vi{v});
	}
	else if(deg[u]==3 || deg[v]==3){
		if(deg[u]==3){
			vi vec; 
			vec.assign(all(adj[u]));
			vec.pb(u);
			inter(vec);
		}
		
		if(deg[v]==3){
			vi vec; 
			vec.assign(all(adj[v]));
			vec.pb(v);
			inter(vec);
		}
	}
	else if(findSet(u)==findSet(v)){
		find_cy(u,v);
		inter(cy);
	}

	joinSet(u,v);
}

int CountCritical(){
	return sz(critical);
}

#ifdef LOCAL
int main() {
    boost; IO();

    int N; cin>>N;
    Init(N);
    
    int Q; cin>>Q;
    while(Q--){
    	int t; cin>>t;
    	if(!t){
    		int u,v; cin>>u>>v;
    		Link(u,v);
    	}
    	else cout << CountCritical() << endl;
    }

    return 0;
}
#endif
//Change your approach

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 39412 KB Output is correct
2 Correct 26 ms 39568 KB Output is correct
3 Correct 28 ms 39628 KB Output is correct
4 Correct 29 ms 39396 KB Output is correct
5 Correct 26 ms 39628 KB Output is correct
6 Correct 27 ms 39884 KB Output is correct
7 Correct 25 ms 39400 KB Output is correct
8 Correct 28 ms 39548 KB Output is correct
9 Correct 27 ms 39648 KB Output is correct
10 Correct 27 ms 39596 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 568 ms 57712 KB Output is correct
2 Correct 1072 ms 67656 KB Output is correct
3 Correct 408 ms 49376 KB Output is correct
4 Correct 1384 ms 91944 KB Output is correct
5 Correct 1403 ms 93204 KB Output is correct
6 Correct 1580 ms 121140 KB Output is correct
7 Correct 358 ms 56248 KB Output is correct
8 Correct 1321 ms 84920 KB Output is correct
9 Correct 1442 ms 87956 KB Output is correct
10 Correct 963 ms 89796 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 39412 KB Output is correct
2 Correct 26 ms 39568 KB Output is correct
3 Correct 28 ms 39628 KB Output is correct
4 Correct 29 ms 39396 KB Output is correct
5 Correct 26 ms 39628 KB Output is correct
6 Correct 27 ms 39884 KB Output is correct
7 Correct 25 ms 39400 KB Output is correct
8 Correct 28 ms 39548 KB Output is correct
9 Correct 27 ms 39648 KB Output is correct
10 Correct 27 ms 39596 KB Output is correct
11 Incorrect 29 ms 39600 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 39412 KB Output is correct
2 Correct 26 ms 39568 KB Output is correct
3 Correct 28 ms 39628 KB Output is correct
4 Correct 29 ms 39396 KB Output is correct
5 Correct 26 ms 39628 KB Output is correct
6 Correct 27 ms 39884 KB Output is correct
7 Correct 25 ms 39400 KB Output is correct
8 Correct 28 ms 39548 KB Output is correct
9 Correct 27 ms 39648 KB Output is correct
10 Correct 27 ms 39596 KB Output is correct
11 Incorrect 29 ms 39600 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 39412 KB Output is correct
2 Correct 26 ms 39568 KB Output is correct
3 Correct 28 ms 39628 KB Output is correct
4 Correct 29 ms 39396 KB Output is correct
5 Correct 26 ms 39628 KB Output is correct
6 Correct 27 ms 39884 KB Output is correct
7 Correct 25 ms 39400 KB Output is correct
8 Correct 28 ms 39548 KB Output is correct
9 Correct 27 ms 39648 KB Output is correct
10 Correct 27 ms 39596 KB Output is correct
11 Correct 568 ms 57712 KB Output is correct
12 Correct 1072 ms 67656 KB Output is correct
13 Correct 408 ms 49376 KB Output is correct
14 Correct 1384 ms 91944 KB Output is correct
15 Correct 1403 ms 93204 KB Output is correct
16 Correct 1580 ms 121140 KB Output is correct
17 Correct 358 ms 56248 KB Output is correct
18 Correct 1321 ms 84920 KB Output is correct
19 Correct 1442 ms 87956 KB Output is correct
20 Correct 963 ms 89796 KB Output is correct
21 Incorrect 29 ms 39600 KB Output isn't correct
22 Halted 0 ms 0 KB -