Compilare: user.cpp: In function ‘int f(int)’: user.cpp:84:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < par.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:123:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &x); ^ user.cpp: In function ‘int fact(int)’: user.cpp:48:16: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] return sgn * a; ^