memory leak detection

#define _CRTDBG_MAP_ALLOC
#include<cstdlib>
#include<crtdbg.h>

#ifdef _DEBUG
	#ifndef DEBUG_NEW
		#define DBG_NEW new ( _NORMAL_BLOCK, __FILE__, __LINE__)
		#define new DBG_NEW
	#endif
#endif

int main(){
	_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
}