Compilare: main.cpp: In function 'void create_graph(int, int)': main.cpp:20:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int j=0; j<graph_in[i].size(); j++) | ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'bool negative_cycle(int, int)': main.cpp:55:1: warning: control reaches end of non-void function [-Wreturn-type] 55 | } | ^