Compilare: main.cpp: In function 'void read()': main.cpp:20:9: warning: unused variable 'm' [-Wunused-variable] int m,a,b; ^ main.cpp:20:11: warning: unused variable 'a' [-Wunused-variable] int m,a,b; ^ main.cpp:20:13: warning: unused variable 'b' [-Wunused-variable] int m,a,b; ^ main.cpp: In function 'void dfs(int, int)': main.cpp:88:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<children[index].size(); i++) ~^~~~~~~~~~~~~~~~~~~~~~~