Compilare: user.cpp: In function ‘void fact(int, int&, int&)’: user.cpp:10:9: warning: unused variable ‘mx’ [-Wunused-variable] int mx = max(a,c); ^ user.cpp: In function ‘int main()’: user.cpp:48:9: warning: unused variable ‘x’ [-Wunused-variable] int x,ans; ^ user.cpp:36:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nmult.in", "r", stdin); ^ user.cpp:37:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nmult.out", "w", stdout); ^ user.cpp:38:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&k,&w); ^