Compilare: main.cpp: In function 'std::vector<edge> merge(std::vector<edge>&, std::vector<edge>&)': main.cpp:70:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | while (i < a.size() && j < b.size()) | ~~^~~~~~~~~~ main.cpp:70:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | while (i < a.size() && j < b.size()) | ~~^~~~~~~~~~ main.cpp:78:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | while (i < a.size()) | ~~^~~~~~~~~~ main.cpp:81:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 81 | while (j < b.size()) | ~~^~~~~~~~~~