2021/winter interview training for facebook/google

puzzles/training/all_possible_subsets.cpp

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+/*
+VIM: let b:cf5build="clang -std=c++20 -O2 -pthread -lstdc++ -I. {SRC} -o {OUT}"
+VIM: let b:cf5run="{OUT}"
+*/
+#include <iostream>
+#include <exception>
+#include <chrono>
+#include <vector>
+
+/*
+Problem Description
+    For given set of N elements print all possible subsets.
+
+Sample inputs - Expected outputs
+  {"a"} ->
+       <- empty set
+    a
+  {"a", "b"} ->
+       <- empty set
+    a
+    b
+    a b
+Input corner cases
+    Empty input set yields to one empty subset.
+*/
+
+void printAllSubsets(const std::vector<std::string> &inputSet, std::ostream &os)
+{
+    std::vector<bool> subset(inputSet.size(), false);
+
+    while (){
+
+        std::cout << '[';
+        for (size_t i = 0; i < inputSet.size(); ++i){
+            if (subset[i]){
+                std::cout << inputSet[i] << ' ';
+            }
+        }
+        std::cout << ']' << std::endl;
+
+
+        std::
+
+    }
+    std::vector<std::string>
+
+}
+
+int main ( void )
+{try{
+    auto begin = std::chrono::high_resolution_clock::now();
+
+
+    //......
+    const std::vector<std::string> inputSet = {"a", "b", "c", "d"};
+    printAllSubsets(inputSet, std::cout);
+
+    auto end = std::chrono::high_resolution_clock::now();
+    std::chrono::duration<double> seconds = end - begin;
+    std::cout << "Time: " << seconds.count() << std::endl;
+    return 0;
+}
+catch ( const std::exception& e )
+{
+    std::cerr << std::endl
+            << "std::exception(\"" << e.what() << "\")." << std::endl;
+    return 2;
+}
+catch ( ... )
+{
+    std::cerr  << std::endl
+            << "unknown exception." << std::endl;
+    return 1;
+}}