Submission #602373

#	Time	Username	Problem	Language	Result	Execution time	Memory
602373		rrrr10000	Keys (IOI21_keys)	C++17	67 / 100	3063 ms	88960 KiB

keys

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> PP;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef vector<bool> vb;
typedef vector<P> vp;
typedef vector<vp> vvp;
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define REP(i,k,n) for(ll i=(ll)(k);i<(ll)(n);i++)
#define fi first
#define se second
#define pb emplace_back
#define all(a) a.begin(),a.end()
template<class T> bool chmax(T &a,T b){if(a<b){a=b;return true;}return false;}
template<class T> bool chmin(T &a,T b){if(a>b){a=b;return true;}return false;}
template<class T> void out(T a){cout<<a<<endl;}
template<class T> void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<endl;}

vector<int> find_reachable(vector<int> r, vector<int> u, vector<int> v, vector<int> c) {
	ll n=r.size(),m=u.size();
	vi ord(n);rep(i,n)ord[i]=i;random_shuffle(all(ord));
	vi seen1(n,-1),seen2(n,-1);
	vb done(n,false),ok_c(n,false);
	vvp g(n);
	vvi edges(n);
	rep(i,m){
		g[u[i]].pb(v[i],c[i]);
		g[v[i]].pb(u[i],c[i]);
	}
	vi p(n,n+1);
	ll cnt_seen1=-1,cnt_seen2=-1;
	for(ll s:ord)if(!done[s]){
		// rep(i,n)assert(edges[i].size()==0);
		vi tmp_c,tmp;
		cnt_seen1++;
		function<bool(ll)> dfs1=[&](ll i){
			if(done[i])return false;
			tmp.pb(i);
			seen1[i]=cnt_seen1;
			if(!ok_c[r[i]]){
				tmp_c.pb(r[i]);
				ok_c[r[i]]=true;
				for(ll x:edges[r[i]])if(seen1[x]!=cnt_seen1){
					if(!dfs1(x))return false;
				}
			}
			for(auto x:g[i])if(seen1[x.fi]!=cnt_seen1){
				if(ok_c[x.se]){
					if(!dfs1(x.fi))return false;
				}
				else{
					tmp_c.pb(x.se);
					edges[x.se].pb(x.fi);
				}
			}
			return true;
		};
		bool res=dfs1(s);
		for(ll x:tmp_c){
			edges[x].clear();
			ok_c[x]=false;
		}tmp_c.clear();
		if(res){
			// out(s);outv(tmp);
			for(ll x:tmp)p[x]=tmp.size();
		}
		done[s]=true;
	}
	ll mi=n+1;
	for(ll x:p)chmin(mi,x);
	vector<int> ans(n);
	rep(i,n)if(p[i]==mi)ans[i]=1;
	return ans;
}

Compilation message (stderr)

keys.cpp: In function 'std::vector<int> find_reachable(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
keys.cpp:34:18: warning: unused variable 'cnt_seen2' [-Wunused-variable]
   34 |  ll cnt_seen1=-1,cnt_seen2=-1;
      |                  ^~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 17 / 17
• Subtask 4: 30 / 30
• Subtask 5: 0 / 33