Compilare: user.cpp: In function ‘int fiud(int)’: user.cpp:27:13: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] return k<<1+1; ^ user.cpp: In function ‘int main()’: user.cpp:83:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ user.cpp:96:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&x,&y,&z); ^