Compilare: user.cpp: In function ‘int sum()’: user.cpp:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<divizors.size();i++) ~^~~~~~~~~~~~~~~~ user.cpp: In function ‘int num()’: user.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<divizors.size();i++) ~^~~~~~~~~~~~~~~~ user.cpp: In function ‘void solve()’: user.cpp:59:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(cop==1) ^~ user.cpp:61:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ i++; ^