Compilare: main.cpp: In function 'int main()': main.cpp:34:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:38:21: warning: array subscript has type 'char' [-Wchar-subscripts] 38 | if(mx>f[s[i]]) | ^ main.cpp:39:22: warning: array subscript has type 'char' [-Wchar-subscripts] 39 | mx=f[s[i]]; | ^ main.cpp:53:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:59:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 59 | if(s.size()-1<i+m[s[i]]) main.cpp:31:12: warning: unused variable 'k' [-Wunused-variable] 31 | int n, k, a, cnt=0, mx=0, l=0; | ^ main.cpp:52:13: warning: 'ch' may be used uninitialized [-Wmaybe-uninitialized] 52 | cout<<f[ch-'a']<<'\n'; | ^~ main.cpp:30:10: note: 'ch' was declared here 30 | char ch; | ^~