Compilare: main.cpp: In function 'int main()': main.cpp:230:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 230 | while ( keep_l[j] < ap[j].size() && ap[j][keep_l[j]] < bs[act] ) | ~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:248:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 248 | if ( keep_l[val[dr]] < ap[val[dr]].size() && ap[val[dr]][keep_l[val[dr]]] < bs[act] ) | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~ main.cpp:264:45: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 264 | if ( ap[val[st]].size() > l[val[st]] && ap[val[st]][l[val[st]]] < st ) | ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~