linux c++ 算法总结

#include <iostream>
#include <vector>

void quickSort(std::vector<int>& arr, int low, int high) {
    if (low < high) {
        int pivot = arr[high];
        int i = low - 1;
        for (int j = low; j < high; j++) {
            if (arr[j] < pivot) {
                i++;
                std::swap(arr[i], arr[j]);
            }
        }
        std::swap(arr[i + 1], arr[high]);
        int pi = i + 1;

        quickSort(arr, low, pi - 1);
        quickSort(arr, pi + 1, high);
    }
}

int main() {
    std::vector<int> arr = {10, 7, 8, 9, 1, 5};
    int n = arr.size();
    quickSort(arr, 0, n - 1);
    std::cout << "Sorted array: ";
    for (int i = 0; i < n; i++) {
        std::cout << arr[i] << " ";
    }
    return 0;
}

#include <iostream>
#include <vector>

int binarySearch(const std::vector<int>& arr, int target) {
    int left = 0;
    int right = arr.size() - 1;
    while (left <= right) {
        int mid = left + (right - left) / 2;
        if (arr[mid] == target) {
            return mid;
        } else if (arr[mid] < target) {
            left = mid + 1;
        } else {
            right = mid - 1;
        }
    }
    return -1; // Not found
}

int main() {
    std::vector<int> arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    int target = 7;
    int result = binarySearch(arr, target);
    if (result != -1) {
        std::cout << "Element found at index " << result << std::endl;
    } else {
        std::cout << "Element not found" << std::endl;
    }
    return 0;
}