Compilare: main.cpp: In function 'void join(int, int)': main.cpp:19:9: warning: unused variable 'pa' [-Wunused-variable] 19 | int pa = parent[a]; | ^~ main.cpp:20:9: warning: unused variable 'pb' [-Wunused-variable] 20 | int pb = parent[b]; | ^~ main.cpp: In function 'int sef(int)': main.cpp:14:19: warning: control reaches end of non-void function [-Wreturn-type] 14 | parent[a] = sef(parent[a]); | ~~~~~~~~~~^~~~~~~~~~~~~~~~