oj.uz

Submission #402172

# Submission time Handle Problem Language Result Execution time Memory
402172 2021-05-11T11:52:24 Z rrrr10000 From Hacks to Snitches (BOI21_watchmen) C++14
0 / 100
 180 ms 24868 KB 
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n)  for(long long i=0;i<(long long)(n);i++)
#define REP(i,k,n) for(long long i=k;i<(long long)(n);i++)
#define pb emplace_back
#define lb(v,k) (lower_bound(all(v),(k))-v.begin())
#define ub(v,k) (upper_bound(all(v),(k))-v.begin())
#define fi first
#define se second
#define pi M_PI
#define PQ(T) priority_queue<T>
#define SPQ(T) priority_queue<T,vector<T>,greater<T>>
#define dame(a) {out(a);return 0;}
#define decimal cout<<fixed<<setprecision(15);
#define all(a) a.begin(),a.end()
#define rsort(a) {sort(all(a));reverse(all(a));}
#define dupli(a) {sort(all(a));a.erase(unique(all(a)),a.end());}
typedef long long ll;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> PP;
typedef tuple<ll,ll,ll,ll> PPP;
using vi=vector<ll>;
using vvi=vector<vi>;
using vvvi=vector<vvi>;
using vvvvi=vector<vvvi>;
using vp=vector<P>;
using vvp=vector<vp>;
using vb=vector<bool>;
using vvb=vector<vb>;
const ll inf=1001001001001001001;
const ll INF=1001001001;
const ll mod=998244353;
const double eps=1e-10;
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<<'\n';}
template<class T> void outp(T a){cout<<'('<<a.fi<<','<<a.se<<')'<<'\n';}
template<class T> void outvp(T v){rep(i,v.size())cout<<'('<<v[i].fi<<','<<v[i].se<<')';cout<<'\n';}
template<class T> void outvvp(T v){rep(i,v.size())outvp(v[i]);}
template<class T> void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<'\n';}
template<class T> void outvv(T v){rep(i,v.size())outv(v[i]);}
template<class T> bool isin(T x,T l,T r){return (l)<=(x)&&(x)<=(r);}
template<class T> void yesno(T b){if(b)out("yes");else out("no");}
template<class T> void YesNo(T b){if(b)out("Yes");else out("No");}
template<class T> void YESNO(T b){if(b)out("YES");else out("NO");}
template<class T> void outset(T s){auto itr=s.begin();while(itr!=s.end()){if(itr!=s.begin())cout<<' ';cout<<*itr;itr++;}cout<<'\n';}
void outs(ll a,ll b){if(a>=inf-100)out(b);else out(a);}
ll gcd(ll a,ll b){if(b==0)return a;return gcd(b,a%b);}
ll modpow(ll a,ll b){ll res=1;a%=mod;while(b){if(b&1)res=res*a%mod;a=a*a%mod;b>>=1;}return res;}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll n,m;cin>>n>>m;
    map<P,ll> edges;
    vvp g(n);
    rep(i,m){
        ll a,b;cin>>a>>b;a--;b--;
        g[a].pb(b,i);g[b].pb(a,i);
        edges[P(min(a,b),max(a,b))]=i;
    }
    ll k;cin>>k;
    vi len(n,1);
    vi ngv(n,-1),nge(m,-1);
    vvp sp(n);
    rep(i,k){
        ll l;cin>>l;
        vi v(l);rep(i,l)cin>>v[i];
        rep(i,l)v[i]--;
        rep(i,l){
            ngv[v[i]]=i;len[v[i]]=l;
        }
        rep(i,l){
            ll id=edges[P(min(v[i],v[(i+1)%l]),max(v[i],v[(i+1)%l]))];
            nge[id]=i;
            sp[v[i]].pb(v[(i+1)%l],id);
            sp[v[(i+1)%l]].pb(v[i],id);
        }
    }
    vb ok(n,false);
    rep(i,n)for(auto x:g[i])if(ngv[x.fi]==-1)ok[i]=true;
    vvi dis(n);
    rep(i,n)dis[i]=vi(len[i],inf);
    dis[0][0]=0;
    vi dis2(n,inf);
    SPQ(PP) pq;pq.emplace(0,0,0);
    while(!pq.empty()){
        ll cost,i,j;tie(cost,i,j)=pq.top();pq.pop();
        if(dis[i][j]!=cost)continue;
        if(chmin(dis2[i],cost)){
            for(auto x:g[i]){
                if(nge[x.se]==cost%len[x.fi])continue;
                ll nc=cost+1;
                if(ngv[x.fi]==nc%len[x.fi])nc++;
                if(chmin(dis[x.fi][nc%len[x.fi]],nc))pq.emplace(nc,x.fi,nc%len[x.fi]);
            }
        }
        for(auto x:sp[i]){
            if(nge[x.se]==cost%len[x.fi])continue;
            ll nc=cost+1;
            if(ngv[x.fi]==nc%len[x.fi]&&ngv[i]==(nc+1)%len[x.fi]){
                if(ok[i])nc++;
                else continue;
            }
            if(chmin(dis[x.fi][nc%len[x.fi]],nc))pq.emplace(nc,x.fi,nc%len[x.fi]);
        }
    }
    ll ans=inf;
    for(ll x:dis[n-1])chmin(ans,x);
    if(ans==inf)out("impossible");
    else out(ans);
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 9284 KB Output is correct
2 Incorrect 180 ms 24868 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 9316 KB Output is correct
2 Incorrect 170 ms 24864 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 9316 KB Output is correct
2 Incorrect 170 ms 24864 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 9316 KB Output is correct
2 Incorrect 170 ms 24864 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 9284 KB Output is correct
2 Incorrect 180 ms 24868 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 9284 KB Output is correct
2 Incorrect 180 ms 24868 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 9284 KB Output is correct
2 Incorrect 180 ms 24868 KB Output isn't correct
3 Halted 0 ms 0 KB -