Compilare: main.cpp: In function 'int main()': main.cpp:29:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int i=k; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:37:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(int i=0; i<rez.size(); i++) | ~^~~~~~~~~~~ main.cpp:82:26: 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] 82 | for(int j=0;j<mat.size();j++) | ~^~~~~~~~~~~ main.cpp:78:30: warning: variable 'idx' set but not used [-Wunused-but-set-variable] 78 | int maxx=0,st=0,dr=0,idx; | ^~~