Compilare: user.cpp: In function ‘void df(int)’: user.cpp:18:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(s[nod]>=0) ^ user.cpp: In function ‘int main()’: user.cpp:35:21: warning: variable ‘j’ set but not used [-Wunused-but-set-variable] int i=0,x=0,y=0,j=0,t=0; ^ user.cpp:38:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:40:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%d",&s[i]); ^ user.cpp:47:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^