Compilare: main.cpp: In function 'bool exists(int)': main.cpp:57:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | if(q == v[i].size() - 1) | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:121:64: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 121 | for(j = v[ord[i]].size() - mat[ord[i - 1]][ord[i]] ; j < v[ord[i]].size() ; j++) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:65:16: warning: unused variable 'q' [-Wunused-variable] 65 | int i,j,ii,q; | ^ main.cpp: In function 'bool exists(int)': main.cpp:51:20: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized] 51 | m = v[j].size() - 1; | ^