Compilare: user.cpp: In function ‘void Eliminare()’: user.cpp:23:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < s.size() - 1 ; ++i){ ^ user.cpp:26:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1 ; j < s.size() ; ++j){ ^ user.cpp: In function ‘int main()’: user.cpp:41:14: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[n + 1] = NULL; ^ user.cpp:46:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < s.size() && isdigit(s[i])){ ^ user.cpp:62:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < s.size() && isalpha(s[i])){ ^ user.cpp:71:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < s.size() && isdigit(s[i])){ ^ user.cpp:85:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v.size() ; i += 2){ ^ user.cpp:88:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v.size() ; ++i){ ^ user.cpp:91:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < v.size() ; ++j){ ^ user.cpp:102:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v.size() ; ++i){ ^