Compilare: main.cpp: In function 'int main()': main.cpp:47:24: warning: unused variable 'aux' [-Wunused-variable] int i,x,y,node,a,b,aux,kk; ^~~ main.cpp:47:28: warning: unused variable 'kk' [-Wunused-variable] int i,x,y,node,a,b,aux,kk; ^~ main.cpp: In function 'void prim()': main.cpp:93:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<V[1].size();i++) ~^~~~~~~~~~~~ main.cpp:104:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<V[var.x].size();j++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:112:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<arb[node].size();i++) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int lca(int, int)': main.cpp:132:9: warning: unused variable 'i' [-Wunused-variable] int i,j; ^ main.cpp:132:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^ main.cpp: In function 'void dfs2(int, int, int)': main.cpp:149:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<trans[node].size();i++) ~^~~~~~~~~~~~~~~~~~~