Language: C++

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define mt make_tuple
#define fi first
#define se second
#define all(a) (a).begin(),(a).end()
#define show(x) cerr << #x << x << endl

typedef long long ll;
typedef unsigned long long ull;

constexpr const int INT_INF=0x3f3f3f3f; // 1061109567
constexpr const ll LL_INF=0x3f3f3f3f3f3f3f3f; // 4557430888798830399

template <typename T> bool chmin(T &a, T b) {
    if (a > b) {a = b;return true;}return false;
}

template <typename T> bool chmax(T &a, T b) {
    if (a < b) {a = b;return true;}return false;
}

// INT
#define GCD(a, b) __gcd(a, b)
template <typename T> T LCM(T a, T b) {return a / GCD(a, b) * b;}
template <typename T> T EXTGCD(T a, T b, T& x, T& y) {
    T d = a;
    if (b != 0) {d=EXTGCD(b,a%b,y,x);y-=(a/b)*x;}
    else x=1,y=0;
    return d;
}
template <typename T> bool is_prime(T a) {
    for(int i=2;i*i<=a;i++)if(a%i==0)return 1;
    return 0;
}

// MOD
const ll MOD = 998244353L;
#define add(a, b) ((a % MOD) + (b % MOD)) % MOD
#define mul(a, b) ((a % MOD) * (b % MOD)) % MOD
#define sub(a, b) ((a % MOD) + MOD - (b % MOD)) % MOD
template <typename T> T mod_inverse(T a, T mod, bool prime){ // if mod is prime, "prime" is true.
    if(prime){
        T tmp=mod-2,now=a,res=1;while(tmp){if(tmp&1)res=mul(res,now);now=mul(now,now);tmp>>=1;}
        return res;
    }else{T x,y;EXTGCD(a,mod,x,y);return (mod+x%mod)%mod;}
}
#define divide(a, b) ((a % MOD) * (mod_inverse(b, MOD, true))) % MOD

//
//
//  　　┓　　　┏
//  　＊┗┓　┏┛
//  　　　┫　┣　＊
//  　┏┳┻━┻┳┓
//  　┗┫　　　┣┛
//  ＊　┣　　━┃　＊        Merry Christmas!!
//  　┏┛　　〃┃
//  　┃●　　　┣━┳┓
//  　┗┻┳━━┛　┣┛
//  　＊　┃┏┓┣┓┃
//WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW

int n;
int a[200001];
int index[200001][20];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.precision(10);
    cout << fixed;
#ifdef LOCAL_DEFINE
    FILE *stream1;
    //FILE *stream2;
    stream1 = freopen("C:\\Users\\naruse\\CLionProjects\\competitive\\cmake-build-debug\\in.txt", "r", stdin);
    //stream2 = freopen("out.txt", "w", stdout);
    if (stream1 == nullptr) return 0;
    //if (stream2 == NULL) return 0;
#endif
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    for (int i = 0; i < 20; i++) {
        index[n - 1][i] = n;
    }
    for (int i = 0; i < 20; i++) {
        int now;
        if (a[n - 1] & (1 << i)) now = n - 1;
        else now = n;
        for (int j = n - 2; j >= 0; j--) {
            if (a[j] & (1 << i)) {
                index[j][i] = now;
                now = j;
            } else {
                index[j][i] = index[j + 1][i];
            }
        }
    }
//    for (int i = 0; i < 4; i++) {
//        for (int j = 0; j < 4; j++) {
//            cout << index[i][j] << " ";
//        }
//        cout << endl;
//    }
    ll ans = 0L;
    for (int i = 0; i < n; i++) {
        int _min = INT_INF;
        for (int j = 0; j < 20; j++) {
            chmin(_min, index[i][j]);
        }
        // cout << i << "->" << _min << endl;
        ans += _min - i;
    }
    cout << ans << endl;
#ifdef  LOCAL_DEFINE
    cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << "s.\n";
#endif
    return 0;
}

Compiler output:
a.cc:71:21: error: 'int index [200001][20]' redeclared as different kind of entity
   71 | int index[200001][20];
      |                     ^
In file included from /usr/include/string.h:462,
                 from /usr/include/c++/14/cstring:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:121,
                 from a.cc:1:
/usr/include/strings.h:50:20: note: previous declaration 'const char* index(const char*, int)'
   50 | extern const char *index (const char *__s, int __c)
      |                    ^~~~~
a.cc: In function 'int main()':
a.cc:91:14: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   91 |         index[n - 1][i] = n;
      |              ^
a.cc:99:22: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   99 |                 index[j][i] = now;
      |                      ^
a.cc:102:22: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
  102 |                 index[j][i] = index[j + 1][i];
      |                      ^
a.cc:102:36: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
  102 |                 index[j][i] = index[j + 1][i];
      |                                    ^
a.cc:116:30: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
  116 |             chmin(_min, index[i][j]);
      |                              ^