อัลกอริทึมที่ไม่แก้ไข: find count all_of

การดำเนินการแบบอ่านอย่างเดียว

std::find

#include <algorithm>
std::vector<int> v = {3, 1, 4, 1, 5};
auto it = std::find(v.begin(), v.end(), 4);
if (it != v.end()) std::cout << "found at " << (it - v.begin());

std::find_if

auto it = std::find_if(v.begin(), v.end(),
    [](int x) { return x > 3; });

std::find_if_not

std::count และ std::count_if

int n = std::count(v.begin(), v.end(), 1);            // count of 1s
int m = std::count_if(v.begin(), v.end(),
    [](int x) { return x > 2; });

std::all_of std::any_of std::none_of

bool allPositive = std::all_of(v.begin(), v.end(),
    [](int x) { return x > 0; });
bool anyEven = std::any_of(v.begin(), v.end(),
    [](int x) { return x % 2 == 0; });

std::equal

std::vector<int> a = {1, 2, 3};
std::vector<int> b = {1, 2, 3};
bool same = std::equal(a.begin(), a.end(), b.begin());

std::mismatch

std::adjacent_find

std::vector<int> v = {1, 2, 2, 3};
auto it = std::adjacent_find(v.begin(), v.end());
std::cout << *it;   // 2

std::min_element std::max_element

auto it = std::max_element(v.begin(), v.end());
std::cout << *it;

std::for_each

std::for_each(v.begin(), v.end(),
    [](int x) { std::cout << x << " "; });

รุ่นที่รับช่วงข้อมูล (C++20)

#include <ranges>
auto it = std::ranges::find(v, 4);
bool ok = std::ranges::all_of(v, [](int x) { return x > 0; });

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