test/yukicoder/0399.test.cpp

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Last update: 2020-10-27 19:04:41+09:00
Problem: https://yukicoder.me/problems/399

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// verification-helper: PROBLEM https://yukicoder.me/problems/399

#include<bits/stdc++.h>
using namespace std;

#define call_from_test
#include "../../string/palindromictree.cpp"
#include "../../string/rollinghash.cpp"
#undef call_from_test

signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  using ll = long long;
  string s,t;
  cin>>s>>t;

  PalindromicTree p1(s),p2(t);
  const int MOD = 1e9+7;
  const int BASE1 = 1777771;
  const int BASE2 = 1e6+3;
  RollingHash<int, MOD, BASE1> rs1(s),rt1(t);
  RollingHash<int, MOD, BASE2> rs2(s),rt2(t);

  const int MAX = 5e5+100;
  map<pair<int, int>, int> m1[MAX];
  for(int i=2;i<(int)p1.size();i++){
    auto& u=p1.vs[i];
    if(u.app<0) continue;
    auto p=make_pair(rs1.find(u.app,u.app+u.len),
                     rs2.find(u.app,u.app+u.len));
    m1[u.len][p]=u.cnt;
  }

  ll ans=0;
  for(int i=2;i<(int)p2.size();i++){
    auto& u=p2.vs[i];
    auto p=make_pair(rt1.find(u.app,u.app+u.len),
                     rt2.find(u.app,u.app+u.len));
    if(u.app<0||!m1[u.len].count(p)) continue;
    ans+=(ll)m1[u.len][p]*u.cnt;
  }

  cout<<ans<<endl;
  return 0;
}

#line 1 "test/yukicoder/0399.test.cpp"
// verification-helper: PROBLEM https://yukicoder.me/problems/399

#include<bits/stdc++.h>
using namespace std;

#define call_from_test
#line 1 "string/palindromictree.cpp"

#line 3 "string/palindromictree.cpp"
using namespace std;
#endif
//BEGIN CUT HERE
struct PalindromicTree{
  struct node{
    map<char, int> nxt;
    int len,suf,app,cnt;
    node():len(-1){}
    node(int len,int suf,int app,int cnt)
      :len(len),suf(suf),app(app),cnt(cnt){}
  };
  vector<node> vs;
  vector<int> ord;
  int n,ptr;

  PalindromicTree(const string &s)
    :vs(s.size()+10),n(2),ptr(1){

    vs[0]=node(-1,0,-1,0);
    vs[1]=node( 0,0,-1,0);

    for(int i=0;i<(int)s.size();i++) add_char(s,i);
    calc_order();
    calc_count();
  }

  bool add_char(const string &s,int pos){
    char ch=s[pos];
    int cur=ptr;
    while(1){
      int rev=pos-1-vs[cur].len;
      if(rev>=0 and s[rev]==ch) break;
      cur=vs[cur].suf;
    }

    if(vs[cur].nxt.count(ch)){
      ptr=vs[cur].nxt[ch];
      vs[ptr].cnt++;
      return false;
    }
    ptr=n++;

    vs[ptr]=node(vs[cur].len+2,-1,pos-vs[cur].len-1,1);
    vs[cur].nxt[ch]=ptr;

    if(vs[ptr].len==1){
      vs[ptr].suf=1;
      return true;
    }

    while(1){
      cur=vs[cur].suf;
      int rev=pos-1-vs[cur].len;
      if(rev>=0 and s[rev]==ch){
        vs[ptr].suf=vs[cur].nxt[ch];
        break;
      }
    }
    return true;
  }

  void calc_order(){
    ord.clear();
    ord.emplace_back(0);
    ord.emplace_back(1);
    for(int i=0;i<(int)ord.size();i++)
      for(auto &p:vs[ord[i]].nxt) ord.emplace_back(p.second);
  }

  void calc_count(){
    for(int i=(int)ord.size()-1;i>=0;i--)
      vs[vs[ord[i]].suf].cnt+=vs[ord[i]].cnt;
  }

  size_t size()const{return n;}
};
//END CUT HERE
#ifndef call_from_test
//INSERT ABOVE HERE
signed main(){
  return 0;
}
#endif
#line 1 "string/rollinghash.cpp"

#line 3 "string/rollinghash.cpp"
using namespace std;
#endif
//BEGIN CUT HERE
template<typename T,T MOD,T B>
struct RollingHash{
  using ll = long long;
  vector<T> hash,po;
  RollingHash(vector<T> vs){init(vs);}
  RollingHash(string &s){
    vector<T> vs;
    for(char c:s) vs.emplace_back(c);
    init(vs);
  }
  void init(vector<T> vs){
    int n=vs.size();
    hash.assign(n+1,0);
    po.assign(n+1,1);
    for(int i=0;i<n;i++){
      hash[i+1]=((ll)hash[i]*B+vs[i])%MOD;
      po[i+1]=(ll)po[i]*B%MOD;
    }
  }
  //S[l, r)
  T find(int l,int r){
    T res=(ll)hash[r]+MOD-(ll)hash[l]*po[r-l]%MOD;
    return res>=MOD?res-MOD:res;
  }
};
//END CUT HERE
#ifndef call_from_test
//INSERT ABOVE HERE
signed main(){
  return 0;
}
#endif
#line 9 "test/yukicoder/0399.test.cpp"
#undef call_from_test

signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  using ll = long long;
  string s,t;
  cin>>s>>t;

  PalindromicTree p1(s),p2(t);
  const int MOD = 1e9+7;
  const int BASE1 = 1777771;
  const int BASE2 = 1e6+3;
  RollingHash<int, MOD, BASE1> rs1(s),rt1(t);
  RollingHash<int, MOD, BASE2> rs2(s),rt2(t);

  const int MAX = 5e5+100;
  map<pair<int, int>, int> m1[MAX];
  for(int i=2;i<(int)p1.size();i++){
    auto& u=p1.vs[i];
    if(u.app<0) continue;
    auto p=make_pair(rs1.find(u.app,u.app+u.len),
                     rs2.find(u.app,u.app+u.len));
    m1[u.len][p]=u.cnt;
  }

  ll ans=0;
  for(int i=2;i<(int)p2.size();i++){
    auto& u=p2.vs[i];
    auto p=make_pair(rt1.find(u.app,u.app+u.len),
                     rt2.find(u.app,u.app+u.len));
    if(u.app<0||!m1[u.len].count(p)) continue;
    ans+=(ll)m1[u.len][p]*u.cnt;
  }

  cout<<ans<<endl;
  return 0;
}