oj.uz

Submission #389809

# Submission time Handle Problem Language Result Execution time Memory
389809 2021-04-14T14:36:39 Z AmineWeslati Parachute rings (IOI12_rings) C++14
37 / 100
 1349 ms 108032 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 || deg[v]>=4){
		if(deg[u]>=4)
			inter(vi{u});
		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 23 ms 39372 KB Output is correct
2 Correct 24 ms 39628 KB Output is correct
3 Correct 25 ms 39652 KB Output is correct
4 Correct 24 ms 39484 KB Output is correct
5 Correct 27 ms 39760 KB Output is correct
6 Correct 28 ms 39864 KB Output is correct
7 Correct 29 ms 39492 KB Output is correct
8 Correct 24 ms 39620 KB Output is correct
9 Correct 25 ms 39576 KB Output is correct
10 Correct 25 ms 39656 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 447 ms 57784 KB Output is correct
2 Correct 939 ms 67580 KB Output is correct
3 Correct 269 ms 43864 KB Output is correct
4 Correct 1209 ms 78552 KB Output is correct
5 Correct 1227 ms 79780 KB Output is correct
6 Correct 1349 ms 108032 KB Output is correct
7 Correct 256 ms 44000 KB Output is correct
8 Correct 1089 ms 72396 KB Output is correct
9 Correct 1208 ms 74520 KB Output is correct
10 Correct 805 ms 77248 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 39372 KB Output is correct
2 Correct 24 ms 39628 KB Output is correct
3 Correct 25 ms 39652 KB Output is correct
4 Correct 24 ms 39484 KB Output is correct
5 Correct 27 ms 39760 KB Output is correct
6 Correct 28 ms 39864 KB Output is correct
7 Correct 29 ms 39492 KB Output is correct
8 Correct 24 ms 39620 KB Output is correct
9 Correct 25 ms 39576 KB Output is correct
10 Correct 25 ms 39656 KB Output is correct
11 Incorrect 28 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 23 ms 39372 KB Output is correct
2 Correct 24 ms 39628 KB Output is correct
3 Correct 25 ms 39652 KB Output is correct
4 Correct 24 ms 39484 KB Output is correct
5 Correct 27 ms 39760 KB Output is correct
6 Correct 28 ms 39864 KB Output is correct
7 Correct 29 ms 39492 KB Output is correct
8 Correct 24 ms 39620 KB Output is correct
9 Correct 25 ms 39576 KB Output is correct
10 Correct 25 ms 39656 KB Output is correct
11 Incorrect 28 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 23 ms 39372 KB Output is correct
2 Correct 24 ms 39628 KB Output is correct
3 Correct 25 ms 39652 KB Output is correct
4 Correct 24 ms 39484 KB Output is correct
5 Correct 27 ms 39760 KB Output is correct
6 Correct 28 ms 39864 KB Output is correct
7 Correct 29 ms 39492 KB Output is correct
8 Correct 24 ms 39620 KB Output is correct
9 Correct 25 ms 39576 KB Output is correct
10 Correct 25 ms 39656 KB Output is correct
11 Correct 447 ms 57784 KB Output is correct
12 Correct 939 ms 67580 KB Output is correct
13 Correct 269 ms 43864 KB Output is correct
14 Correct 1209 ms 78552 KB Output is correct
15 Correct 1227 ms 79780 KB Output is correct
16 Correct 1349 ms 108032 KB Output is correct
17 Correct 256 ms 44000 KB Output is correct
18 Correct 1089 ms 72396 KB Output is correct
19 Correct 1208 ms 74520 KB Output is correct
20 Correct 805 ms 77248 KB Output is correct
21 Incorrect 28 ms 39628 KB Output isn't correct
22 Halted 0 ms 0 KB -