View Compilation Error

0_0_33565422_31033.cpp: In function 'int mypow(int, ll)':
0_0_33565422_31033.cpp:15:7: error: 'y' was not declared in this scope
   if (y & 1)
       ^
0_0_33565422_31033.cpp:16:4: error: 'res' was not declared in this scope
    res = res * x % mod;
    ^
0_0_33565422_31033.cpp:16:16: error: 'x' was not declared in this scope
    res = res * x % mod;
                ^
0_0_33565422_31033.cpp:17:3: error: 'x' was not declared in this scope
   x = x * x % mod;
   ^