Compilare: user.cpp: In function ‘void prec()’: user.cpp:20:25: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if((1 << j) & i == 0) ^ user.cpp:8:7: warning: unused variable ‘d’ [-Wunused-variable] int d, first, win; ^ user.cpp: In function ‘int main()’: user.cpp:33:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:39:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &bit); ^