//Never stop trying
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
typedef string str;
typedef long long ll;
typedef double db;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
typedef vector<str> vs;
typedef vector<ld> vd;
#define pb push_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
const int MOD = 998244353;
const ll INF = 1e18;
const int MX = 2e5 + 10;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up
template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))
#define dbg(x) cerr << " - " << #x << " : " << x << endl;
#define dbgs(x,y) cerr << " - " << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << " - " << #v << " : " << endl << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
void IO() {
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
}
int mp(char c){
if(c>='a' && c<='z') return (c-'a');
return (c-'A')+26;
}
int main() {
boost;
int N; cin>>N;
vs vec[11];
FOR(i,0,N){
str s; cin>>s;
vec[sz(s)].pb(s);
reverse(all(s));
vec[sz(s)].pb(s);
}
FOR(x,3,11) vec[x].erase(unique(all(vec[x])),vec[x].end());
ll ans=0;
FOR(x,3,11){
ll cnt[52][52]; FOR(i,0,52) FOR(j,0,52) cnt[i][j]=0;
for(auto s: vec[x]) cnt[mp(s[0])][mp(s.back())]++;
ll D[52][52][52];
FOR(i,0,52) FOR(j,0,52) FOR(k,0,52){
D[i][j][k]=0;
FOR(l,0,52){
D[i][j][k]+=(((cnt[l][i]*cnt[l][j])%MOD)*cnt[l][k])%MOD;
D[i][j][k]%=MOD;
}
}
FOR(i,0,52) FOR(j,0,52) FOR(k,0,52) FOR(l,0,52){
ans+=(((D[i][j][k]*D[i][j][l])%MOD)*((D[i][k][l]*D[j][k][l])%MOD))%MOD;
ans%=MOD;
}
}
cout << ans << endl;
return 0;
}
/* Careful!!!
.Array bounds
.Infinite loops
.Uninitialized variables / empty containers
.Order of input
Some insights:
.Binary search
.Graph representation
.Write brute force code
.Change your approach
*/
Compilation message
cubeword.cpp:3: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
3 | #pragma GCC optimization ("O3")
|
cubeword.cpp:4: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
4 | #pragma GCC optimization ("unroll-loops")
|
cubeword.cpp: In function 'void IO()':
cubeword.cpp:49:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
49 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
cubeword.cpp:50:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
50 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
822 ms |
8304 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
822 ms |
8304 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
822 ms |
8304 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
822 ms |
8304 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
