Compilare: user.cpp: In function ‘void down(int)’: user.cpp:32:26: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] int fs = p<<1, fd = p<<1+1, bun = p; ^ user.cpp: In function ‘int main()’: user.cpp:125:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n,&k); ^ user.cpp:129:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &x, &y); ^