Simple map, filter in c++

2024/07/cpp_algorithms1/.gitignore

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+cmake-build*

2024/07/cpp_algorithms1/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.28)
+project(cpp_algorithms1)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_executable(cpp_algorithms1 main.cpp)

2024/07/cpp_algorithms1/main.cpp

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+#include <algorithm>
+#include <iostream>
+#include <numeric>
+#include <vector>
+
+int main() {
+    std::cout << "Hello, World!" << std::endl;
+
+    std::vector<int> numbers = {1, 2, -1, 3, -2, 4};
+
+    numbers.erase(std::remove_if(
+            numbers.begin(),
+            numbers.end(),
+            [](int x) { return x < 0; }),
+            numbers.end());
+
+    auto sum = 0;
+    for (auto it = numbers.begin(); it != numbers.end(); it++) {
+        sum += *it;
+    }
+
+    std::cout << "Sum is: " << sum << "." << std::endl;
+
+    sum = 0;
+
+    auto res = std::accumulate(
+            numbers.begin(),
+            numbers.end(),
+            1,
+            [](int a, int b) { return a * b; });
+
+    std::cout << "Multiplication is: " << res << "." << std::endl;
+
+    return 0;
+}