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int expo(int a,int b,int M)
{
    int res=1;
    a%=M;
    while(b)
    {
        if(b&1)
        {
            res=(res*1ll*a)%M;
        }
        a=(a*1ll*a)%M;
        b>>=1;
    }
    return res;
}
 
int fun(vector<int> arr) {
    int M =1e9+7, n=arr.size();
    int ans=0;
    for(int i=0; i<n;i++)
    {
        ans |=arr[i];
    }
 
    ans = (expo(2,n-1,M) *1ll* ans)%M;
    return ans;
}

prog.cpp:17:9: error: ‘vector’ was not declared in this scope
 int fun(vector<int> arr) {
         ^~~~~~
prog.cpp:17:16: error: expected primary-expression before ‘int’
 int fun(vector<int> arr) {
                ^~~

Standard output is empty