Compilare: user.cpp: In function ‘bool fu(int)’: user.cpp:71:19: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] y=x-(1<<p)+1<<u; ^ user.cpp: In function ‘int main()’: user.cpp:99:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d", &n); ^ user.cpp:100:26: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(str,1,4500000,fi); ^ user.cpp: In function ‘bool fu(int)’: user.cpp:69:5: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(x&(1<<p)){ ^