Compilare: user.cpp: In function ‘bool is_good(int)’: user.cpp:35:24: warning: unused variable ‘t’ [-Wunused-variable] int i,j,k,p,n,m,ok,t=x; ^ user.cpp: In function ‘int main()’: user.cpp:72:36: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(type=='B') x = x | (1<<i-1); ^ user.cpp:92:31: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] y = x^(1<<B[i]-1)^(1<<F[j]-1); ^ user.cpp:92:43: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] y = x^(1<<B[i]-1)^(1<<F[j]-1); ^ user.cpp:68:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&N,&D); ^ user.cpp:71:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %c",&v[i].x,&v[i].y,&type); ^