Compilare: main.cpp: In function 'int verif(int, int)': main.cpp:13:24: 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 i = 0; i <= s[0].size() - l; i++ ) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:21:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for ( int j = 0; j <= s[k].size() - l && ok == 0; j++ ) { | ~~^~~~~~~~~~~~~~~~~~