Compilare: main.cpp: In function 'bool check(const std::vector<Segment>&, int)': main.cpp:31:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i = 0; i < o.size(); i += 2) { | ~~^~~~~~~~~~ main.cpp:32:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int j = i + 2; j < o.size(); j += 2) { | ~~^~~~~~~~~~ main.cpp:42:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for(int k = 0; k < v.size(); k += 2) { | ~~^~~~~~~~~~ main.cpp:46:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for(int l = k + 2; l < v.size(); l += 2) { | ~~^~~~~~~~~~ main.cpp:14:9: warning: unused variable 'n' [-Wunused-variable] 14 | int n = segments.size(); | ^