Compilare: main.cpp: In function 'bool check(int)': main.cpp:16:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(j=0;j+lg<=s[i].size();j++) | ~~~~^~~~~~~~~~~~~ main.cpp:12:13: warning: unused variable 'k' [-Wunused-variable] 12 | int i,j,k,l; | ^ main.cpp:12:15: warning: unused variable 'l' [-Wunused-variable] 12 | int i,j,k,l; | ^ main.cpp: In function 'int main()': main.cpp:26:10: warning: unused variable 'j' [-Wunused-variable] 26 | int i,j; | ^