unique.cpp: In function 'void PickUnique(int)':
unique.cpp:10:6: error: ambiguating new declaration of 'void PickUnique(int)'
void PickUnique(int N) {
^~~~~~~~~~
In file included from unique.cpp:1:0:
unique.h:3:18: note: old declaration 'std::vector<int> PickUnique(int)'
std::vector<int> PickUnique(int N);
^~~~~~~~~~
unique.cpp:14:37: error: 'Report' was not declared in this scope
for(int i=1; i<=N; i++) if(chk[i]) Report(i);
^~~~~~
unique.cpp:14:37: note: suggested alternative: 'short'
for(int i=1; i<=N; i++) if(chk[i]) Report(i);
^~~~~~
short