Compilare: main.cpp: In function 'std::vector<std::__cxx11::basic_string<char> > flip(const std::vector<std::__cxx11::basic_string<char> >&)': main.cpp:12:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int i=0; i<mat.size(); ++i) | ~^~~~~~~~~~~ main.cpp:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int j=0; j<mat[i].size(); ++j) | ~^~~~~~~~~~~~~~ main.cpp: In function 'std::vector<int> manacher(const std::vector<std::__cxx11::basic_string<char> >&)': main.cpp:34:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int i=0; i<v.size(); ++i) | ~^~~~~~~~~ main.cpp:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | while(i+man[i]<man.size() && i-man[i]>=0 && v[i+man[i]]==v[i-man[i]]) | ~~~~~~~~^~~~~~~~~~~ main.cpp: In function 'std::vector<int> getVec(const std::vector<int>&)': main.cpp:55:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for(int i=0; i<man.size(); i+=2) | ~^~~~~~~~~~~ main.cpp:61:21: warning: moving a local object in a return statement prevents copy elision [-Wpessimizing-move] 61 | return std::move(ans); | ~~~~~~~~~^~~~~ main.cpp:61:21: note: remove 'std::move' call main.cpp: In function 'long long int solve(const std::vector<std::__cxx11::basic_string<char> >&)': main.cpp:78:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for(int i=1; i<left.size(); ++i) | ~^~~~~~~~~~~~ main.cpp:82:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 82 | for(int i=1; i<right.size(); ++i) | ~^~~~~~~~~~~~~