Compilare: user.cpp: In function ‘void dfs2(int, int)’: user.cpp:31:9: warning: unused variable ‘frunza’ [-Wunused-variable] int frunza=1,p,k,lpr2,vf; ^~~~~~ user.cpp: In function ‘unsigned int getint()’: user.cpp:100:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(dp,DN,1,fin2),ptr=0; ^ user.cpp:105:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(dp,DN,1,fin2),ptr=0; ^