Compilare: user.cpp: In function ‘int main()’: user.cpp:109:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:111:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",s[i]+1); ^ user.cpp: In function ‘void calc()’: user.cpp:84:31: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] st[nr].p=p; ^