#include <bits/stdc++.h>
#define pb push_back
#define fst first
#define snd second
#define fore(i,a,b) for(ll i=a,isudgh=b;i<isudgh;i++)
#define SZ(x) ((int)(x).size())
#define ALL(x) x.begin(),x.end()
#define mset(a,v) memset((a),(v),sizeof(a))
#define imp(v) {for(auto jhglkdfjg:v)cout<<jhglkdfjg<<" ";cout<<"\n";}
#define FIN ios::sync_with_stdio(0);cin.tie(0);cout.tie(0)
using namespace std;
typedef int ll;
typedef long long LL;
typedef pair<ll,ll> ii;
// #pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
const ll MOD=998244353,MAXA=62;
ll add(ll a, ll b){a+=b;if(a>=MOD)a-=MOD;return a;}
ll sub(ll a, ll b){a-=b;if(a<0)a+=MOD;return a;}
ll mul(LL a, LL b){return a*b%MOD;}
int fpow(int a, ll b){
int r=1;
while(b){if(b&1)r=mul(r,a); b>>=1; a=mul(a,a);}
return r;
}
ll A; //alphabet
ll q[62][62];
ll solve(vector<string>&a){
if(!SZ(a))return 0;
// cout<<"solve "; imp(a);
ll n=SZ(a);
vector<char>c;
fore(i,0,n)c.pb(a[i][0]),c.pb(a[i].back());
sort(ALL(c));
vector<char> ci;
fore(i,0,SZ(c))if(!i||c[i]!=c[i-1])ci.pb(c[i]);
c=ci;
for(auto &s:a){
auto change=[&](char &j){
ll p=lower_bound(ALL(c),j)-c.begin();
j=p;
};
change(s[0]); change(s.back());
}
// imp(a);
A=SZ(c);
set<string> st[A][A];
for(auto s:a){
st[int(s[0])][int(s.back())].insert(s);
reverse(ALL(s));
st[int(s[0])][int(s.back())].insert(s);
}
fore(i,0,A)fore(j,0,A)q[i][j]=SZ(st[i][j]);
/*fore(i,0,A){
imp(q[i]);
}*/
vector<ll>pot(5);
pot[0]=1;
fore(i,1,5)pot[i]=pot[i-1]*A;
vector<ll>num(pot[3]);
fore(mk,0,pot[3]){
vector<ll>a(3);
ll mki=mk;
fore(i,0,3)a[i]=mki%A,mki/=A;
fore(c,0,A){
ll val=1;
fore(j,0,3)val=mul(val,q[a[j]][c]);
num[mk]=add(num[mk],val);
}
}
ll ans=0;
fore(mk,0,pot[4]){
ll res=1,m=mk%pot[3];
fore(i,0,4){
res=mul(res,num[m]);
m=(m+(m%A*pot[3]))/A;
}
ans=add(ans,res);
// imp(a);
// imp(num);
// cout<<": "<<res<<"\n\n";
}
return ans;
}
const ll MAXV=11;
int main(){FIN;
ll n; cin>>n;
vector<string> b[MAXV];
fore(i,0,n){
string s;cin>>s;
b[SZ(s)].pb(s);
}
ll res=0;
fore(i,0,MAXV){
res=add(res,solve(b[i]));
}
// res=solve(b[5]);
cout<<res<<"\n";
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
62 ms |
7544 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
62 ms |
7544 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
62 ms |
7544 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
62 ms |
7544 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
