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int ans = 0;
for (int i = 0; i < 33; i++)
{
    int cnt = 0;
    int chk = 0;
 
    for (int j = 0; j < n; j++)
    {
        if (arr[j] & (1ll << i))
        {
            chk ^= 1;
        }
        cnt += (chk == 1);
    }
 
    for (int j = 0; j < n; j++)
    {
        ans += (1ll << i) * cnt;
 
        if (arr[j] & (1ll << i))
        {
            cnt = n - j - cnt;
        }
    }
}

prog.cpp:2:1: error: expected unqualified-id before ‘for’
 for (int i = 0; i < 33; i++)
 ^~~
prog.cpp:2:17: error: ‘i’ does not name a type
 for (int i = 0; i < 33; i++)
                 ^
prog.cpp:2:25: error: ‘i’ does not name a type
 for (int i = 0; i < 33; i++)
                         ^

Standard output is empty