/in/foo.cc: In function 'int main()':
/in/foo.cc:13:19: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define fp(i,a,b) for(re int i=a;i<=b;i++)
                   ^
/in/foo.cc:40:7: note: in expansion of macro 'fp'
       fp(i,1,p) vis[i]=0;vis[0]=1;
       ^~
/in/foo.cc:40:26: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
       fp(i,1,p) vis[i]=0;vis[0]=1;
                          ^~~