Language: C++

// C
#ifndef _GLIBCXX_NO_ASSERT
#include <cassert>
#endif
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>

#ifdef __GXX_EXPERIMENTAL_CXX0X__
#include <ccomplex>
#include <cfenv>
#include <cinttypes>
#include <cstdbool>
#include <cstdint>
#include <ctgmath>
#include <cwchar>
#include <cwctype>
#endif

// C++
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>

#ifdef __GXX_EXPERIMENTAL_CXX0X__
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#endif
//#include <bits/stdc++.h>

#define all(v) v.begin(), v.end()
typedef long long ll;
#define rep(i, z, n) for(ll i = z; i < n; i++)
//const int INF = 1<<29;
//const int MODINF = 1000000007;
using namespace std;

int main(){
    int N;
    cin >> N;
    vector<int> A(N), B(N), C(N - 1);
    rep(i, 0, N) cin >> A.at(i);
    rep(i, 0, N) cin >> B.at(i);
    rep(i, 0, N - 1) cin >> C.at(i);
    int sum = 0;
    int con = - 1;
    rep(i, 0, N){
        if(A.at(i) == con + 1) sum += C.at(A.at(i) - 2);
        sum += B.at(A.at(i) - 1);
        con = A.at(i);
    }
    cout << sum << endl;
}
// C
#ifndef _GLIBCXX_NO_ASSERT
#include <cassert>
#endif
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>

#ifdef __GXX_EXPERIMENTAL_CXX0X__
#include <ccomplex>
#include <cfenv>
#include <cinttypes>
#include <cstdbool>
#include <cstdint>
#include <ctgmath>
#include <cwchar>
#include <cwctype>
#endif

// C++
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>

#ifdef __GXX_EXPERIMENTAL_CXX0X__
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#endif
//#include <bits/stdc++.h>

#define all(v) v.begin(), v.end()
typedef long long ll;
#define rep(i, z, n) for(ll i = z; i < n; i++)
//const int INF = 1<<29;
//const int MODINF = 1000000007;
using namespace std;

int main(){
    int N;
    cin >> N;
    vector<int> A(N), B(N), C(N - 1);
    rep(i, 0, N) cin >> A.at(i);
    rep(i, 0, N) cin >> B.at(i);
    rep(i, 0, N - 1) cin >> C.at(i);
    int sum = 0;
    int con = - 1;
    rep(i, 0, N){
        if(A.at(i) == con + 1) sum += C.at(A.at(i) - 2);
        sum += B.at(A.at(i) - 1);
        con = A.at(i);
    }
    cout << sum << endl;
}


Compiler output:
a.cc:205:5: error: redefinition of 'int main()'
  205 | int main(){
      |     ^~~~
a.cc:95:5: note: 'int main()' previously defined here
   95 | int main(){
      |     ^~~~