Compilare: main.cpp: In function 'int main()': main.cpp:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<nod.size(); i++) ~^~~~~~~~~~~ main.cpp:32:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<dx[nod[i]].size(); j++) ~^~~~~~~~~~~~~~~~~~ main.cpp:12:26: warning: unused variable 'cod' [-Wunused-variable] int n, a, b, i=1, j, cod, nr=0, nivel=0; ^~~ main.cpp:12:31: warning: unused variable 'nr' [-Wunused-variable] int n, a, b, i=1, j, cod, nr=0, nivel=0; ^~