Compilare: main.cpp: In function 'int main()': main.cpp:84:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<Edge> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 84 | for (int x = 0; x < graph.size(); ++x) { | ~~^~~~~~~~~~~~~~ main.cpp:121:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 121 | for (int j = 0; j < chain.size(); ++j) { | ~~^~~~~~~~~~~~~~ main.cpp:141:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 141 | for (int j = 0; j < chain.size(); ++j) { | ~~^~~~~~~~~~~~~~ main.cpp:160:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 160 | for (int j = 0; j < chain.size(); ++j) { | ~~^~~~~~~~~~~~~~ main.cpp:102:13: warning: variable 'destination' set but not used [-Wunused-but-set-variable] 102 | int destination; | ^~~~~~~~~~~