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#include <iostream>
using namespace std;
int t,n,m,a,b,x,y,vis[10000][10000],ans;
void _find(int i,int j){
	if(vis[i][j]!=1) ans++;
	else if(vis[i][j]==1) return;
	if(i+a>n) i=(i+a)-n;
	if(j+b>m) j=(j+b)-m;
	vis[i][j]=1;
	_find(i+a,j+b);
}
int main() {
	while(t){
		memset(vis,0,sizeof(vis));
		find(x,y);
		cout<<ans;
	}
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:14:27: error: ‘memset’ was not declared in this scope
   memset(vis,0,sizeof(vis));
                           ^
prog.cpp:15:11: error: no matching function for call to ‘find(int&, int&)’
   find(x,y);
           ^
In file included from /usr/include/c++/6/bits/locale_facets.h:48:0,
                 from /usr/include/c++/6/bits/basic_ios.h:37,
                 from /usr/include/c++/6/ios:44,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/streambuf_iterator.h:369:5: note: candidate: template<class _CharT2> typename __gnu_cxx::__enable_if<std::__is_char<_CharT2>::__value, std::istreambuf_iterator<_CharT> >::__type std::find(std::istreambuf_iterator<_CharT>, std::istreambuf_iterator<_CharT>, const _CharT2&)
     find(istreambuf_iterator<_CharT> __first,
     ^~~~
/usr/include/c++/6/bits/streambuf_iterator.h:369:5: note:   template argument deduction/substitution failed:
prog.cpp:15:11: note:   mismatched types ‘std::istreambuf_iterator<_CharT>’ and ‘int’
   find(x,y);
           ^

Standard output is empty