Compilare: user.cpp: In function ‘int main()’: user.cpp:33:62: warning: operation on ‘lgneg’ may be undefined [-Wsequence-point] fscanf(f,"%d %d",&neg[++lgneg].y,&neg[++lgneg].y); ^ user.cpp:49:62: warning: operation on ‘lgpoz’ may be undefined [-Wsequence-point] fscanf(f,"%d %d",&poz[++lgpoz].y,&poz[++lgpoz].y); ^ user.cpp:25:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,x,maxid=0; queue <punct> q; punct aux; ^ user.cpp:26:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:29:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^ user.cpp:33:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&neg[++lgneg].y,&neg[++lgneg].y); ^ user.cpp:49:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&poz[++lgpoz].y,&poz[++lgpoz].y); ^