#include <bits/stdc++.h>
using namespace std;
#define int long
const int B = 62, LIM = 8, M = 998244353;
int get(char c) {
if(c < 60) return c - 48;
return c - (c < 95 ? 55 : 61);
}
int n, a[LIM][B][B], b[LIM][B][B][B], res;
map<string, bool> inp;
int i, j, k, l, x;
#define c(i, j, k, l) ((b[L][i][j][l] * b[L][j][k][l]) % M)
signed main() {
cin >> n;
while(n--) {
string s; cin >> s;
i = size(s);
if(inp[s]) continue;
string t = s;
reverse(begin(t), end(t));
inp[s] = inp[t] = 1;
int z = get(s[0]), y = get(end(s)[-1]);
++a[i-3][z][y];
if(s != t) ++a[i-3][y][z];
}
for(int L = 0; L < LIM; L++) {
for(int i = 0; i < B; i++) for(int j = 0; j < B; j++) for(int k = 0; k < B; k++) for(int x = 0; x < b; x++) b[L][i][j][k] += a[L][i][x] * a[L][j][x] * a[L][k][x];
for(int i = 0; i < B; i++) for(int j = 0; j < B; j++) for(int k = 0; k < B; k++) b[L][i][j][k] %= M;
for(int i = 0; i < B; i++) for(int j = 0; j < B; j++) for(int k = 0; k < B; k++) for(int l = 0; l < B; l++) res += (c(i, j, k, l) * c(l, k, j, i)) % M;
}
cout << res % M;
}
Compilation message
cubeword.cpp: In function 'int main()':
cubeword.cpp:31:101: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
31 | for(int i = 0; i < B; i++) for(int j = 0; j < B; j++) for(int k = 0; k < B; k++) for(int x = 0; x < b; x++) b[L][i][j][k] += a[L][i][x] * a[L][j][x] * a[L][k][x];
| ~~^~~
