Compilare: main.cpp: In member function 'int DSU_Tree::bottleneck(int, int)': main.cpp:193:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ctr >= aa.size() and ctr >= bb.size())break; ~~~~^~~~~~~~~~~~ main.cpp:193:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ctr >= aa.size() and ctr >= bb.size())break; ~~~~^~~~~~~~~~~~ main.cpp:194:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ctr>= aa.size()){ ~~~^~~~~~~~~~~~ main.cpp:196:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] }else if(ctr >= bb.size()){ ~~~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:285:7: warning: unused variable 'ctr' [-Wunused-variable] int ctr = 0; ^~~