Compilare: user.cpp: In function ‘int main()’: user.cpp:52:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1;i <= w.size() ;i++ ){ ^ user.cpp:47:6: warning: unused variable ‘n’ [-Wunused-variable] int n = strlen(str1); ^ user.cpp:48:6: warning: unused variable ‘m’ [-Wunused-variable] int m = strlen(str2); ^