Compilare: main.cpp: In function 'int main()': main.cpp:30:19: 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] 30 | for (i = 1; i <= s.size(); i++) | ~~^~~~~~~~~~~ main.cpp:53:28: 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 (i = hssave; i < s.size(); i) | ~~^~~~~~~~~~ main.cpp:53:40: warning: for increment expression has no effect [-Wunused-value] 53 | for (i = hssave; i < s.size(); i) | ^ main.cpp:63:25: 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] 63 | if (!(i < s.size() / 2 && i >= s.size() / 2)) | ~~^~~~~~~~~~~~~~ main.cpp:63:45: 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] 63 | if (!(i < s.size() / 2 && i >= s.size() / 2)) | ~~^~~~~~~~~~~~~~~ main.cpp:26:26: warning: unused variable 'maxx' [-Wunused-variable] 26 | int st, dr, cnt = 0, maxx, pref1 = 0, pref2 = 0, suf1 = 0, suf2 = 0, i, hsst = 0, hsdr = 0, savehash1 = -1, savehash2 = -1, hssave, achash1, achash2, achs = 0, dist = 0, sp = 0, j; | ^~~~ main.cpp:26:175: warning: variable 'sp' set but not used [-Wunused-but-set-variable] 26 | int st, dr, cnt = 0, maxx, pref1 = 0, pref2 = 0, suf1 = 0, suf2 = 0, i, hsst = 0, hsdr = 0, savehash1 = -1, savehash2 = -1, hssave, achash1, achash2, achs = 0, dist = 0, sp = 0, j; | ^~