Submission #1105772

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105772		mrwang	Viruses (BOI20_viruses)	C++14	25 / 100	221 ms	7672 KiB

Viruses

#include<bits/stdc++.h>
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxn=500;
const ll inf=1e18;
const ll mod=1e9+7;
struct TrieNode {
    int nxt[2], link;
};
const ll maxN=2e5;
vector<TrieNode> Trie;
vector<ll> adj[maxN];
ll val[maxn];
ll  numNode, nTree, numQuery;
ll a[maxn];
void insertString(ll len) {
    int pt(0);
    for (int i=1;i<=len;i++) {
        int c=a[i];
        if(!Trie[pt].nxt[c]) {
            Trie[pt].nxt[c] = Trie.size();
            Trie.emplace_back();
        }
        pt = Trie[pt].nxt[c];
    }
    val[pt]=1;
}

void buildAutomaton(void) {
    queue<int> qu;
    qu.push(0);
    while(qu.size()) {
        int v(qu.front()), u(Trie[v].link);
        qu.pop();
        for (int c = 0; c < 2; ++c) {
            if(Trie[v].nxt[c]) {
                Trie[Trie[v].nxt[c]].link = (v) ? Trie[u].nxt[c] : 0;
                qu.push(Trie[v].nxt[c]);
            } else {
                Trie[v].nxt[c] = Trie[u].nxt[c];
            }
        }
    }
}
void preDfs(int u,int p) {
    for (int it = 0; it < int(adj[u].size()); ++it) {
        int v(adj[u][it]);
        val[v]+=val[u];
        preDfs(v,u);
    }
}
void buildTree(void) {
    nTree = Trie.size();
    for (int i = 1; i < nTree; ++i)
        adj[Trie[i].link].push_back(i);
    preDfs(0,0);
}
ll z,m,n;
vector<pli>vec[maxn];
vector<ll>cc[maxn];
ll dp[2][55][55];
vector<vector<ll>>query;
vector<ll>id;
ll nxt[55][55],dis[100][55][55];
void solve()
{
    Trie.emplace_back();
    cin >> z >> n >> m;
    for(int i=1;i<=n;i++)
    {
        ll x;
        cin >> x;
        ll k;
        cin >> k;
        vector<ll>bd;
        while(k--)
        {
            ll z;
            cin >> z;
            bd.pb(z);
        }
        query.pb(bd);
        id.pb(x);
    }
    for(int i=1;i<=m;i++)
    {
        ll k;
        cin >> k;
        for(int j=1;j<=k;j++)
        {
            cin >> a[j];
        }
        insertString(k);
    }
    buildAutomaton();
    numNode=Trie.size();
    buildTree();
    for(int i=0;i<=z;i++)
    {
        for(int j=0;j<numNode;j++)
        {
            for(int k=0;k<numNode;k++)
            {
                dis[i][j][k]=inf;
            }
        }
    }
    for(int i=0;i<2;i++)
    {
        for(int u=0;u<numNode;u++)
        {
            ll luu=u;
            while(u!=0&&Trie[u].nxt[i]==0)
            {
                u=Trie[u].link;
            }
            nxt[luu][i]=Trie[u].nxt[i];
            if(val[Trie[u].nxt[i]]==0)
            {
                dis[i][luu][Trie[u].nxt[i]]=1;
            }
            u=luu;
        }
    }
    //cout << nxt[1][0]<<'\n';
    for(int turn=0;turn<=n;turn++)
    {
        for(int i=0;i<n;i++)
        {
            for(int j=0;j<numNode;j++)
            {
                for(int q=0;q<numNode;q++)
                {
                    dp[0][j][q]=dp[1][j][q]=inf;
                }
            }
            int p=0;
            for(int j=0;j<numNode;j++) dp[p][j][j]=0;
            for(auto x:query[i])
            {
                for(int j=0;j<numNode;j++)
                {
                    for(int q=0;q<numNode;q++)
                    {
                        if(dp[p][j][q]==inf) continue;
                        /*if(x<=1)
                        {
                            dp[p^1][j][nxt[q][x]]=min(dp[p^1][j][nxt[q][x]],dp[p][j][q]+dis[x][q][nxt[q][x]]);
                        }*/
                        for(int k=0;k<numNode;k++)
                        {
                            dp[p^1][j][k]=min(dp[p^1][j][k],dp[p][j][q]+dis[x][q][k]);
                        }
                        dp[p][j][q]=inf;
                    }
                }
                p^=1;
            }
            for(int j=0;j<numNode;j++)
            {
                for(int q=0;q<numNode;q++)
                {
                    dis[id[i]][j][q]=min(dis[id[i]][j][q],dp[p][j][q]);
                }
            }
        }
    }
    for(int i=2;i<=z-1;i++)
    {
        ll ans=inf;
        for(int j=0;j<numNode;j++)
        {
            ans=min(ans,dis[i][0][j]);
        }
        if(ans!=inf) cout <<"NO "<< ans << '\n';
        else cout << "YES" << '\n';
    }
}
int main()
{
    fastio
    //freopen("c.INP","r",stdin);
    //freopen(TASKNAME".OUT","w",stdout);
    solve();
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 14
• Subtask 3: 25 / 25
• Subtask 4: 0 / 32
• Subtask 5: 0 / 18