foo.cc: In function 'void Search2(int, int, int*, bool)':
foo.cc:64:29: warning: unused variable 'j' [-Wunused-variable]
     int c=(a[0]+a[1]+u)%n,i,j;
                             ^
foo.cc: In function 'void Search(int, bool)':
foo.cc:129:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(i=0;i<n-1;i++)
     ^~~
foo.cc:130:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
       cout<<num[i]<<' ';cout<<num[i];
                         ^~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。