Submission #1039432

#	Time	Username	Problem	Language	Result	Execution time	Memory
1039432		vjudge1	Cubeword (CEOI19_cubeword)	C++17	100 / 100	221 ms	18908 KiB

cubeword

#include <bits/stdc++.h>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define fi first
#define se second
#define endl "\n"
#define rep(a,b,c) for(int a=b; a<c; a++)
#define rep2(a,b,c,d) for(ll a=b; a<c; a+=d)
#define repr(a,b,c) for(ll a=b-1; a>c-1; a--)
#define repa(a,b) for(const auto &a: b)
#define multicase() int t; cin>>t; while(t--)
#define fastIO() ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define valid(c) cout<<(c ? "YES" : "NO")<<endl;
#define valid2(c,a,b) cout<<(c ? a : b)<<endl;
#define ll long long 
#define pq_min(a) priority_queue<a, vector<a>, greater<a>>
#define pq_max(a) priority_queue<a>
#define pb push_back
#define mid ((l+r)>>1)
#define flush endl<<flush;

using namespace std;

const ll mod=998244353;

int main(){
	fastIO();
	int n;
	cin>>n;
	string s;
	set<string> st;
	ll t[11][62][62]{};
	map<char,int> val;
	rep(i,0,26){
		val[i+'a']=i;
		val[i+'A']=i+26;
	}
	rep(i,0,10) val[i+'0']=i+52;
	rep(i,0,n){
		cin>>s;
		st.insert(s);
		reverse(s.begin(),s.end());
		st.insert(s);
	}
	repa(e,st) t[e.size()][val[e[0]]][val[e.back()]]++;
	ll ans=0, aux;
	rep(z,3,11){
		ll C[62][62][62]{};
		rep(i,0,62) rep(j,i,62) rep(k,j,62){
			rep(l,0,62){
				aux=t[z][i][l]*t[z][j][l];
				aux=(aux<mod ? aux : aux%mod);
				aux*=t[z][k][l];
				aux=(aux<mod ? aux : aux%mod);
				C[i][j][k]+=aux;
				C[i][j][k]=(C[i][j][k]<mod ? C[i][j][k] : C[i][j][k]%mod);
			}
			C[i][k][j]=C[j][i][k]=C[j][k][i]=C[k][i][j]=C[k][j][i]=C[i][j][k];
		}
		rep(i,0,62) rep(j,i,62) rep(k,j,62) rep(l,k,62){
			int a[4]={1,1,1,1}, p;
			if(i==j) a[1]+=a[0];
			if(j==k) a[2]+=a[1];
			if(k==l) a[3]+=a[2];
			p=24/(a[0]*a[1]*a[2]*a[3]);
			aux=C[i][j][k]*C[i][j][l];
			aux=(aux<mod ? aux : aux%mod);
			aux*=C[i][k][l];
			aux=(aux<mod ? aux : aux%mod);
			aux*=C[j][k][l];
			aux=(aux<mod ? aux : aux%mod);
			aux*=p;
			aux=(aux<mod ? aux : aux%mod);
			ans+=aux;
			ans=(ans<mod ? ans : ans%mod);
		}
	}
	cout<<ans<<endl;
}

• Subtask 1: 21 / 21
• Subtask 2: 29 / 29
• Subtask 3: 34 / 34
• Subtask 4: 16 / 16