Compilare: main.cpp: In function 'int main()': main.cpp:44:9: warning: unused variable 'i' [-Wunused-variable] int i,x,y,node,a,b,aux,kk; ^ main.cpp:44:11: warning: unused variable 'x' [-Wunused-variable] int i,x,y,node,a,b,aux,kk; ^ main.cpp:44:13: warning: unused variable 'y' [-Wunused-variable] int i,x,y,node,a,b,aux,kk; ^ main.cpp:44:15: warning: unused variable 'node' [-Wunused-variable] int i,x,y,node,a,b,aux,kk; ^~~~ main.cpp:44:24: warning: unused variable 'aux' [-Wunused-variable] int i,x,y,node,a,b,aux,kk; ^~~ main.cpp:44:28: warning: unused variable 'kk' [-Wunused-variable] int i,x,y,node,a,b,aux,kk; ^~ main.cpp: In function 'void prim()': main.cpp:74:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<V[1].size();i++) ~^~~~~~~~~~~~ main.cpp:85:19: 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:93:14: 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:101:9: warning: unused variable 'i' [-Wunused-variable] int i,j,dist=0; ^ main.cpp:101:11: warning: unused variable 'j' [-Wunused-variable] int i,j,dist=0; ^