Compilare: user.cpp: In function ‘void rec(int, int, int, int)’: user.cpp:5:21: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] int nrlin=1<<pas-1; ^ user.cpp: In function ‘int main()’: user.cpp:30:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banda.in","r",stdin); ^ user.cpp:31:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banda.out","w",stdout); ^ user.cpp:32:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&k,&p,&val); ^