Compilare: user.cpp: In function ‘int bkk(int, int)’: user.cpp:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=a;i++) ~^~~ user.cpp:21:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr*divizors[op]*i>a) ~~~~~~~~~~~~~~~~~^~ user.cpp:23:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(nr%i==0 && i>1) ^~ user.cpp:25:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ cout<<b<<"\n"; ^~~~ user.cpp:28:1: warning: control reaches end of non-void function [-Wreturn-type] } ^