Compilare: main.cpp: In function 'void bellman(int)': main.cpp:34:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if(viz[i.first]==v[i.first].size()+1) | ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:11: warning: unused variable 'j' [-Wunused-variable] 47 | int i,j,x,y,c; | ^