password.cpp

#include<iostream>
#include<cstdlib>
#include<vector>
#include<unordered_map>
#include<map>

#define long long long
#define nln '\n'

using namespace std;

int main()
{
    cin.tie(0)->sync_with_stdio(0);
    cout.tie(0)->sync_with_stdio(0);
    //freopen("password.inp", "r", stdin);
    long n;
    cin >> n;
    unordered_map<string, long> cnt1, cnt2;
    // cnt1 la dem nguyen xau
    // cnt2 la dem tung thanh phan cua xau
    long ans = 0;
    while (n--){
        string str;
        cin >> str;
        ans += cnt2[str];
        map<string, bool> tic;
        for (long i = 0; i < (long)str.size(); ++i)
            for (long j = 0; j < (long)str.size()-i; ++j){
                if (tic[str.substr(j, i+1)])
                    continue;
                ans += cnt1[str.substr(j, i+1)];
                ++cnt2[str.substr(j, i+1)];
                tic[str.substr(j, i+1)] = 1;}
        ++cnt1[str];}
    cout << ans << nln;
    return 0;
}