Language: C++

#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define R cin>>
#define ll long long
#define ln cout<<'\n'
#define in(a) insert(a)
#define pb(a) push_back(a)
#define pd(a) printf("%.10f\n",a)
#define mem(a) memset(a,0,sizeof(a))
#define all(c) (c).begin(),(c).end()
#define iter(c) __typeof((c).begin())
#define rrep(i,n) for(ll i=(ll)(n)-1;i>=0;i--)
#define REP(i,m,n) for(ll i=(ll)(m);i<(ll)(n);i++)
#define rep(i,n) REP(i,0,n)
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
ll check(ll n,ll m,ll x,ll y){return x>=0&&x<n&&y>=0&&y<m;}void pr(){ln;}
template<class A,class...B>void pr(const A &a,const B&...b){cout<<a<<(sizeof...(b)?" ":"");pr(b...);}
template<class A>void PR(A a,ll n){rep(i,n)cout<<(i?" ":"")<<a[i];ln;}
const ll MAX=1e9+7,MAXL=1LL<<61,dx[8]={-1,0,1,0,-1,-1,1,1},dy[8]={0,1,0,-1,-1,1,1,-1};
typedef pair<ll,string> P;

struct RH {
  vector<unsigned long long> p,hash;
  void init(const string s) {
    unsigned long long m=1000000007,q=1,n=s.size();
    p.resize(n+1);hash.resize(n+1);p[0]=q;hash[0]=0;
    rep(i,n){p[i+1]=p[i]*m;hash[i+1]=s[i]+hash[i]*m;}
  }
  unsigned long long h(int i)const{return hash[i];}
  unsigned long long h(int i,int j)const{return h(j)-h(i)*p[j-i];}
};

map<unsigned long long,ll> m[2222222][26];

RH r;
string s[2222222];
P p[2222222];
void Main() {
  ll n;
  R n;
  rep(i,n) R s[i];
  rep(i,n) reverse(all(s[i]));
  rep(i,n) p[i]=P(s[i].size(),s[i]);
  sort(p,p+n);
  ll ans=0;
  rep(l,n) {
    string t=p[l].S;
    r.init(t);
    ll c[26];
    mem(c);
    ll mm=t.size();
    rrep(i,mm) {
      c[t[i]-'a']=1;
      rep(j,26) {
        if(c[j]&&m[i][j].count(r.h(i))) ans+=m[i][j][r.h(i)];
      }
    }
    int k=t.back()-'a';
    m[mm-1][k][r.h(mm-1)]++;
  }
  pr(ans);
}

int main(){ios::sync_with_stdio(0);cin.tie(0);Main();return 0;}


Compiler output:
/tmp/cchr2KUj.o: in function `Main()':
a.cc:(.text+0x9f): relocation truncated to fit: R_X86_64_PC32 against symbol `s[abi:cxx11]' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0xe2): relocation truncated to fit: R_X86_64_PC32 against symbol `s[abi:cxx11]' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0x102): relocation truncated to fit: R_X86_64_PC32 against symbol `s[abi:cxx11]' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0x149): relocation truncated to fit: R_X86_64_PC32 against symbol `s[abi:cxx11]' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0x15f): relocation truncated to fit: R_X86_64_PC32 against symbol `s[abi:cxx11]' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0x1a6): relocation truncated to fit: R_X86_64_PC32 against symbol `p[abi:cxx11]' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0x202): relocation truncated to fit: R_X86_64_PC32 against symbol `p[abi:cxx11]' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0x20f): relocation truncated to fit: R_X86_64_PC32 against symbol `p[abi:cxx11]' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0x248): relocation truncated to fit: R_X86_64_PC32 against symbol `p[abi:cxx11]' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0x28b): relocation truncated to fit: R_X86_64_PC32 against symbol `r' defined in .bss section in /tmp/cchr2KUj.o
a.cc:(.text+0x361): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status