oj.uz

Submission #337989

# Submission time Handle Problem Language Result Execution time Memory
337989 2020-12-22T08:46:06 Z rrrr10000 One-Way Streets (CEOI17_oneway) C++14
100 / 100
 224 ms 28264 KB 
#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<bool> vb;
typedef vector<vb> vvb;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<PP> vpp;
#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 all(v) v.begin(),v.end()
#define dupli(v) {sort(all(v));v.erase(unique(all(v)),v.end());}
#define rsort(a) {sort(all(a));reverse(all(a));}
#define pb emplace_back
#define fi first
#define se second
#define lb(v,k) (lower_bound(all(v),k)-v.begin())
template<class T>bool chmin(T&a,T b){if(a>b){a=b;return true;}return false;}
template<class T>bool chmax(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 outp(T a){cout<<'('<<a.fi<<','<<a.se<<')'<<endl;}
template<class T>void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<endl;}
template<class T>void outvp(T v){for(auto a:v)cout<<'('<<a.fi<<','<<a.se<<')';cout<<endl;}
template<class T>void outvv(T v){for(auto x:v)outv(x);}
template<class T>void outvvp(T v){for(auto x:v)outvp(x);}
const ll inf=1001001001001001001;
class UF{
    vi sz,par;
public:
    UF(ll n){
        sz=vi(n,1);rep(i,n)par.pb(i);
    }
    ll root(int i){
        if(par[i]==i)return i;
        return root(par[i]);
    }
    void merge(int a,int b){
        a=root(a);b=root(b);
        if(a==b)return;
        if(sz[a]>sz[b])swap(a,b);
        par[a]=b;
        sz[b]+=sz[a];
    }
};
int main(){
    ll n,m;cin>>n>>m;
    vvp g(n);
    vb rev(m,false);
    rep(i,m){
        ll a,b;cin>>a>>b;a--;b--;
        g[a].pb(b,i);g[b].pb(a,-i-1);
    }
    vi ans(m),dep(n,-1),lk(n,inf);
    vp par(n,P(-1,-1));
    UF uf(n);
    function<void(ll,ll,ll)> dfs=[&](ll i,ll p,ll e){
        for(P x:g[i])if(x.se!=e&&-1-x.se!=e){
            if(dep[x.fi]==-1){
                if(x.se<0){
                    x.se*=-1;x.se--;rev[x.se]=true;
                }
                dep[x.fi]=dep[i]+1;
                dfs(x.fi,i,x.se);
                chmin(lk[i],lk[x.fi]);
            }
            else{
                if(x.se<0){
                    x.se*=-1;x.se--;
                }
                else rev[x.se]=true;
                chmin(lk[i],dep[x.fi]);
            }
        }
        if(lk[i]<dep[i])uf.merge(i,p);
        else par[uf.root(i)]=P(p,e);
    };
    vi rt;
    rep(i,n)if(dep[i]==-1){
        rt.pb(i);
        dep[i]=0;
        dfs(i,-1,-1);
    }
    vvp tree(n);
    rep(i,n)if(par[i].fi!=-1)tree[uf.root(par[i].fi)].pb(i,par[i].se);
    vi cnt(n);
    ll q;cin>>q;
    rep(i,q){
        ll a,b;cin>>a>>b;a--;b--;
        cnt[uf.root(a)]++;cnt[uf.root(b)]--;
    }
    function<ll(ll,ll,ll)> add=[&](ll i,ll p,ll e){
        for(auto x:tree[i])if(x.fi!=p)cnt[i]+=add(x.fi,i,x.se);
        if(cnt[i]>0)ans[e]=1;
        if(cnt[i]<0)ans[e]=-1;
        return cnt[i];
    };
    for(ll x:rt)add(uf.root(x),-1,-1);
    rep(i,m)if(rev[i])ans[i]*=-1;
    rep(i,m){
        if(ans[i]==-1)cout<<'R';
        if(ans[i]==0)cout<<'B';
        if(ans[i]==1)cout<<'L';
    }cout<<endl;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 2 ms 492 KB Output is correct
5 Correct 2 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 2 ms 492 KB Output is correct
8 Correct 2 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 2 ms 492 KB Output is correct
5 Correct 2 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 2 ms 492 KB Output is correct
8 Correct 2 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 90 ms 10984 KB Output is correct
12 Correct 101 ms 13160 KB Output is correct
13 Correct 122 ms 16104 KB Output is correct
14 Correct 139 ms 19812 KB Output is correct
15 Correct 141 ms 20836 KB Output is correct
16 Correct 165 ms 20324 KB Output is correct
17 Correct 168 ms 22752 KB Output is correct
18 Correct 157 ms 20472 KB Output is correct
19 Correct 137 ms 24288 KB Output is correct
20 Correct 102 ms 14184 KB Output is correct
21 Correct 93 ms 13668 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 2 ms 492 KB Output is correct
5 Correct 2 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 2 ms 492 KB Output is correct
8 Correct 2 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 90 ms 10984 KB Output is correct
12 Correct 101 ms 13160 KB Output is correct
13 Correct 122 ms 16104 KB Output is correct
14 Correct 139 ms 19812 KB Output is correct
15 Correct 141 ms 20836 KB Output is correct
16 Correct 165 ms 20324 KB Output is correct
17 Correct 168 ms 22752 KB Output is correct
18 Correct 157 ms 20472 KB Output is correct
19 Correct 137 ms 24288 KB Output is correct
20 Correct 102 ms 14184 KB Output is correct
21 Correct 93 ms 13668 KB Output is correct
22 Correct 204 ms 23904 KB Output is correct
23 Correct 201 ms 21600 KB Output is correct
24 Correct 224 ms 21480 KB Output is correct
25 Correct 202 ms 28264 KB Output is correct
26 Correct 199 ms 23264 KB Output is correct
27 Correct 205 ms 21728 KB Output is correct
28 Correct 85 ms 6508 KB Output is correct
29 Correct 176 ms 14828 KB Output is correct
30 Correct 161 ms 14952 KB Output is correct
31 Correct 166 ms 15336 KB Output is correct
32 Correct 170 ms 19968 KB Output is correct