oj.uz

Submission #389810

# Submission time Handle Problem Language Result Execution time Memory
389810 2021-04-14T14:38:27 Z AmineWeslati Parachute rings (IOI12_rings) C++14
37 / 100
 1353 ms 108296 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});
	if(deg[v]>=4)
		inter(vi{v});

	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);
	}
	
	if(deg[u]==2 && deg[v]==2 && 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 24 ms 39372 KB Output is correct
2 Correct 26 ms 39536 KB Output is correct
3 Correct 27 ms 39616 KB Output is correct
4 Correct 25 ms 39500 KB Output is correct
5 Correct 26 ms 39600 KB Output is correct
6 Correct 27 ms 39872 KB Output is correct
7 Correct 25 ms 39500 KB Output is correct
8 Correct 28 ms 39620 KB Output is correct
9 Correct 28 ms 39668 KB Output is correct
10 Correct 27 ms 39580 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 466 ms 57740 KB Output is correct
2 Correct 952 ms 67560 KB Output is correct
3 Correct 292 ms 43956 KB Output is correct
4 Correct 1215 ms 78696 KB Output is correct
5 Correct 1234 ms 79800 KB Output is correct
6 Correct 1353 ms 108296 KB Output is correct
7 Correct 285 ms 44084 KB Output is correct
8 Correct 1136 ms 72452 KB Output is correct
9 Correct 1196 ms 74532 KB Output is correct
10 Correct 828 ms 77116 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 39372 KB Output is correct
2 Correct 26 ms 39536 KB Output is correct
3 Correct 27 ms 39616 KB Output is correct
4 Correct 25 ms 39500 KB Output is correct
5 Correct 26 ms 39600 KB Output is correct
6 Correct 27 ms 39872 KB Output is correct
7 Correct 25 ms 39500 KB Output is correct
8 Correct 28 ms 39620 KB Output is correct
9 Correct 28 ms 39668 KB Output is correct
10 Correct 27 ms 39580 KB Output is correct
11 Incorrect 27 ms 39628 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 39372 KB Output is correct
2 Correct 26 ms 39536 KB Output is correct
3 Correct 27 ms 39616 KB Output is correct
4 Correct 25 ms 39500 KB Output is correct
5 Correct 26 ms 39600 KB Output is correct
6 Correct 27 ms 39872 KB Output is correct
7 Correct 25 ms 39500 KB Output is correct
8 Correct 28 ms 39620 KB Output is correct
9 Correct 28 ms 39668 KB Output is correct
10 Correct 27 ms 39580 KB Output is correct
11 Incorrect 27 ms 39628 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 39372 KB Output is correct
2 Correct 26 ms 39536 KB Output is correct
3 Correct 27 ms 39616 KB Output is correct
4 Correct 25 ms 39500 KB Output is correct
5 Correct 26 ms 39600 KB Output is correct
6 Correct 27 ms 39872 KB Output is correct
7 Correct 25 ms 39500 KB Output is correct
8 Correct 28 ms 39620 KB Output is correct
9 Correct 28 ms 39668 KB Output is correct
10 Correct 27 ms 39580 KB Output is correct
11 Correct 466 ms 57740 KB Output is correct
12 Correct 952 ms 67560 KB Output is correct
13 Correct 292 ms 43956 KB Output is correct
14 Correct 1215 ms 78696 KB Output is correct
15 Correct 1234 ms 79800 KB Output is correct
16 Correct 1353 ms 108296 KB Output is correct
17 Correct 285 ms 44084 KB Output is correct
18 Correct 1136 ms 72452 KB Output is correct
19 Correct 1196 ms 74532 KB Output is correct
20 Correct 828 ms 77116 KB Output is correct
21 Incorrect 27 ms 39628 KB Output isn't correct
22 Halted 0 ms 0 KB -