Compilare: user.cpp: In function ‘int main()’: user.cpp:28:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s1.size(); i++) { ^ user.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s2.size(); i++) { ^ user.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol.size(); i++) ^ user.cpp:40:7: warning: variable ‘lim’ set but not used [-Wunused-but-set-variable] int lim = -1; ^