Compilare: main.cpp: In function 'int main()': main.cpp:75:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<Edge> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (int x = 0; x < graph.size(); ++x) { | ~~^~~~~~~~~~~~~~ main.cpp:107:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 107 | for (int j = 0; j < chain.size(); ++j) { | ~~^~~~~~~~~~~~~~ main.cpp:125:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 125 | for (int j = 0; j < chain.size(); ++j) { | ~~^~~~~~~~~~~~~~ main.cpp:143:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 143 | for (int j = 0; j < chain.size(); ++j) { | ~~^~~~~~~~~~~~~~ main.cpp:89:13: warning: variable 'destination' set but not used [-Wunused-but-set-variable] 89 | int destination; | ^~~~~~~~~~~