Compilare: main.cpp: In function 'int main()': main.cpp:44:6: warning: unused variable 'i' [-Wunused-variable] {int i,start=1; ^ main.cpp: In function 'void dfs(int)': main.cpp:70:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<A[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'void initializare()': main.cpp:137:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[start].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:130:32: warning: variable 'varf' set but not used [-Wunused-but-set-variable] {int start=1,i,minim=INT_MAX/2,varf=0; ^~~~ main.cpp: In function 'void prim()': main.cpp:159:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[nod].size();j++) ~^~~~~~~~~~~~~~