Compilare: main.cpp: In function 'bool ok(std::string, int)': main.cpp:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int i=0;i<a.size();i++) | ~^~~~~~~~~ main.cpp:23:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | if(poz>=s.size() || u[poz][a[i]-'a']==-1 || u[poz][a[i]-'a']+k-1>=l[a[i]].size()) | ~~~^~~~~~~~~~ main.cpp:23:81: warning: array subscript has type 'char' [-Wchar-subscripts] 23 | if(poz>=s.size() || u[poz][a[i]-'a']==-1 || u[poz][a[i]-'a']+k-1>=l[a[i]].size()) | ^ main.cpp:23:73: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | if(poz>=s.size() || u[poz][a[i]-'a']==-1 || u[poz][a[i]-'a']+k-1>=l[a[i]].size()) | ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:27:21: warning: array subscript has type 'char' [-Wchar-subscripts] 27 | poz = l[a[i]][u[poz][a[i]-'a']+k-1]+1; | ^ main.cpp: In function 'int main()': main.cpp:36:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp:38:15: warning: array subscript has type 'char' [-Wchar-subscripts] 38 | l[s[i]].push_back(i); | ^ main.cpp:39:24: warning: array subscript has type 'char' [-Wchar-subscripts] 39 | cnt[i] = l[s[i]].size()-1; | ^