Compilare: user.cpp: In function ‘int main()’: user.cpp:69:20: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(SZ(G[i])&1==1) ^ user.cpp: In function ‘void read()’: user.cpp:19:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&m); ^ user.cpp:21:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%d%d",&x,&y); ^