/in/foo.cc: In function 'void rotate(int)':
/in/foo.cc:14:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(nrt(v)) ch[w][y]=u; fa[u]=w; fa[v]=u;
     ^~
/in/foo.cc:14:28: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     if(nrt(v)) ch[w][y]=u; fa[u]=w; fa[v]=u;
                            ^~