Compilare: user.cpp: In function ‘void scan()’: user.cpp:7:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%lld%lld",&n,&k); ^ user.cpp: In function ‘void solve()’: user.cpp:24:9: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(k-nr+i>0){ ^