View Compilation Error

0_0_28607186_25621.cpp: In function 'int main()':
0_0_28607186_25621.cpp:24:17: error: 'i' was not declared in this scope
             for(i=2; i<=n; i=i+2) t=t^(a[i]-a[i-1]-1);
                 ^
0_0_28607186_25621.cpp:24:35: error: 't' was not declared in this scope
             for(i=2; i<=n; i=i+2) t=t^(a[i]-a[i-1]-1);
                                   ^
0_0_28607186_25621.cpp:25:16: error: 't' was not declared in this scope
             if(t==0)cout<<"Bob"<<endl;
                ^
0_0_28607186_25621.cpp:30:13: error: 't' was not declared in this scope
             t=a[1];
             ^
0_0_28607186_25621.cpp:31:17: error: 'i' was not declared in this scope
             for(i=3; i<=n; i=i+2) t=t^(a[i]-a[i-1]-1);
                 ^