View Compilation Error

0_0_21530897_26038.cpp: In function 'int main()':
0_0_21530897_26038.cpp:47:21: error: expected ';' before ')' token
    for(int k=2+(n&1));i<=n;i+=2) t^=num[i]-num[i-1]-1;
                     ^
0_0_21530897_26038.cpp:47:21: error: expected primary-expression before ')' token
0_0_21530897_26038.cpp:47:21: error: expected ';' before ')' token
0_0_21530897_26038.cpp:47:23: error: 'i' was not declared in this scope
    for(int k=2+(n&1));i<=n;i+=2) t^=num[i]-num[i-1]-1;
                       ^