Compilare: main.cpp: In function 'int32_t main()': main.cpp:26:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for (j=0; j<s[i].size(); j++) | ~^~~~~~~~~~~~ main.cpp:28:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | if (j>=s[i-1].size() || s[i-1][j]!=s[i][j]) | ~^~~~~~~~~~~~~~~