/in/p2.cpp: In function 'opaque_list* chop(list_t, unsigned int)':
/in/p2.cpp:209:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (size(list)<n) {
         ~~~~~~~~~~^~
/in/p2.cpp: In function 'bool covered_by(tree_t, tree_t)':
/in/p2.cpp:414:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
 { if (depth(A)>depth(B))
   ^~
/in/p2.cpp:416:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     if (depth(A)==0)
     ^~