Answer / Rahul Chandra

To transform any static control into a hyperlink in C++, you can use the `SetWindowLongPtr()` function to set a custom window procedure and handle the `WM_LBUTTONDOWN` message:n```cppn#include <windows.h>n#include <shlobj.h>nnclass HyperlinkStatic : public CWindow {npublic:n HyperlinkStatic(HWND parent) : CWindow(parent, WC_STATIC) {n SetLongPtr(GWLP_USERDATA, reinterpret_cast<LONG_PTR>(this));n RegisterClass();n }nprivate:n static LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {n auto hWndUserData = GetWindowLongPtr(hwnd, GWLP_USERDATA);n if (hWndUserData == reinterpret_cast<LONG_PTR>(this)) {n if (message == WM_LBUTTONDOWN) {n POINT pt;n GetCursorPos(&pt);n ScreenToClient(hwnd, &pt);n const auto range = GetTextRange();n SendMessage(hwnd, EM_EXSETSEL, 0, MAKELPARAM(range.cpMin, range.cpMax));n OpenURL(this);n }n }n return DefWindowProc(hwnd, message, wParam, lParam);n }n void RegisterClass() {n WNDCLASSEXW wcex;n ZeroMemory(&wcex, sizeof(wcex));n wcex.cbSize = sizeof(wcex);n wcex.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;n wcex.lpfnWndProc = WndProc;n wcex.hInstance = GetModuleHandle(nullptr);n wcex.lpszClassName = TEXT("HyperlinkStatic");n RegisterClassEx(wcex);n }n void OpenURL(HWND hwnd) const {n const auto textRange = GetTextRange();n if (textRange.cpMin <= textRange.cpMax) {n IShellLink* psl;n CoCreateInstance(CLSID_ShellLink, nullptr, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&psl));n PWSTR url = nullptr;n if (SUCCEEDED(psl->SetPath(textRange.chrg.cpMin, &url))) {n IFACEMETHODCALLMACRO(psl, SetAttributes, DWORD(LNK_INVISIBLE | LNK_NOREPRESENTATION), 0);n CoTaskMemFree(url);n }n psl->Release();n }n }n TEXTMETRICW textMetrics;n CHARRANGE textRange = {0};n void GetTextRange() {n if (GetTextLength(&textRange.cpMax) > 0) {n GetText(textRange.chrg, &textMetrics, CFM_TEXT);n textRange.cpMax += textRange.cpMin + textMetrics.tmAveCharWidth;n }n }n};n``

Coin Problem You are given 9 gold coins that look identical. One is counterfeit and weighs a bit greater than the others, but the difference is very small that only a balance scale can tell it from the real one. You have a balance scale that costs 25 USD per weighing. Give an algorithm that finds the counterfeit coin with as little weighting as possible. Of primary importance is that your algorithm is correct; of secondary importance is that your algorithm truly uses the minimum number of weightings possible. HINT: THE BEST ALGORITHM USES ONLY 2 WEIGHINGS!!!

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