Compilare: main.cpp: In function 'bool read_and_check_graph(std::istream&)': main.cpp:12:32: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 12 | for (size_t node = 1; node <= nodes; node++) | ~~~~~^~~~~~~~ main.cpp:15:32: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 15 | for (size_t edge = 1; edge <= edges; edge++) { | ~~~~~^~~~~~~~