Compilare: user.cpp: In function ‘int main()’: user.cpp:11:21: warning: unused variable ‘j’ [-Wunused-variable] int n,d,k,x,y,i,j,mx=-LONG_MAX,m; ^ user.cpp:11:36: warning: unused variable ‘m’ [-Wunused-variable] int n,d,k,x,y,i,j,mx=-LONG_MAX,m; ^ user.cpp:12:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&n,&d,&k); ^ user.cpp:13:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1;i<=d;i++) {fscanf(f,"%d%d",&x,&y); a[x][y]=1;} ^ user.cpp:14:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1;i<=k;i++) {fscanf(f,"%d%d",&x,&y); a[x][y]=-1; b[x]++;} ^