Compilare: user.cpp: In function ‘bool cmp(const int&, const int&)’: user.cpp:21:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < max(strlen(dic[a]), strlen(dic[b])); i++) ^ user.cpp: In function ‘int main()’: user.cpp:47:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < strlen(dic[v[i]]) && dic[v[i - 1]][j] == dic[v[i]][j]; j++); ^ user.cpp: In function ‘bool cmp(const int&, const int&)’: user.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] } ^