foo.cc: In function 'void Search2(int, int, int*, bool)':
foo.cc:64:29: warning: unused variable 'j' [-Wunused-variable]
   64 |     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]
  129 |     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'
  130 |       cout<<num[i]<<' ';cout<<num[i];
      |                         ^~~~

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