Compilare: main.cpp: In function 'bool neg_cycle(int, std::vector<std::vector<std::vector<int> > >&, double)': main.cpp:15:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int k = 0;k < adj[j].size();++k) | ~~^~~~~~~~~~~~~~~ main.cpp:27:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for(int j = 0;j < adj[i].size();++j) | ~~^~~~~~~~~~~~~~~