Compilare: main.cpp: In function 'void add_box()': main.cpp:66:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Line>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for(int i = (int)l.size() - 4; i < l.size(); i++) { | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:152:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Line>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 152 | for(int i = 0; i < l.size(); i++) { | ~~^~~~~~~~~~ main.cpp:164:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Line>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 164 | for(int i = 0; i < v.size(); i++) { | ~~^~~~~~~~~~ main.cpp:187:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<Line>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 187 | for(int i = 0; i < q.size(); i++) { | ~~^~~~~~~~~~ main.cpp:193:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 193 | for(int i = 0; i < cnt.size(); i++) { | ~~^~~~~~~~~~~~