Compilare: main.cpp: In function 'int main()': main.cpp:110:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 110 | for (int j = 0; j < chain.size(); ++j) { | ~~^~~~~~~~~~~~~~ main.cpp:128:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 128 | for (int j = 0; j < chain.size(); ++j) { | ~~^~~~~~~~~~~~~~ main.cpp:146:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 146 | for (int j = 0; j < chain.size(); ++j) { | ~~^~~~~~~~~~~~~~ main.cpp:92:13: warning: variable 'destination' set but not used [-Wunused-but-set-variable] 92 | int destination; | ^~~~~~~~~~~