Compilare: main.cpp: In function 'int main()': main.cpp:32:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | while (poz[i][c-'a'] != a[i][c-'a'].size() && a[i][c-'a'][poz[i][c-'a']] <= pmax[i]) | ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:34:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if (poz[i][c-'a']!=a[i][c-'a'].size()) | ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~ main.cpp:51:21: warning: unused variable 'p' [-Wunused-variable] 51 | int p=st[i].top(); | ^