Compilare: user.cpp: In function ‘bool ok(int, std::__cxx11::string)’: user.cpp:14:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); i++) { ~~^~~~~~~~~~ user.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz + val - 1 >= f[x[i] - 'a'].size()) ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp:17:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < x.size() - 1) ~~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:36:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (val + pas <= n / b.size() && ok(val + pas, b)) { ~~~~~~~~~~^~~~~~~~~~~~~~~ user.cpp:33:9: warning: unused variable ‘st’ [-Wunused-variable] int st = 1, dr = n / b.size(), sol = 0; ^~ user.cpp:33:17: warning: unused variable ‘dr’ [-Wunused-variable] int st = 1, dr = n / b.size(), sol = 0; ^~ user.cpp:33:36: warning: unused variable ‘sol’ [-Wunused-variable] int st = 1, dr = n / b.size(), sol = 0; ^~~