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Learn how to Sum the Two Lowest Optimistic Integers in C++


The problem

Create a perform that returns the sum of the 2 lowest constructive numbers given an array of minimal 4 constructive integers. No floats or non-positive integers might be handed.

For instance, when an array is handed like [19, 5, 42, 2, 77], the output must be 7.

[10, 343445353, 3453445, 3453545353453] ought to return 3453455.

The answer in C++

Choice 1:

#embody <algorithm>
#embody <vector>

lengthy sumTwoSmallestNumbers(std::vector<int> numbers) {
    std::type(numbers.start(), numbers.finish());
    return (lengthy)numbers[0] + (lengthy)numbers[1];
}

Choice 2:

#embody <algorithm>

unsigned int sumTwoSmallestNumbers(std::vector<int> numbers) {
  std::nth_element(start(numbers), subsequent(start(numbers)), finish(numbers));
  return (unsigned int)(numbers[0] + numbers[1]);
}

Choice 3:

lengthy sumTwoSmallestNumbers(std::vector<int> numbers) {
    std::type(numbers.start(), numbers.finish());
    return (lengthy lengthy)numbers.at(0) + numbers.at(1);
}

Check circumstances to validate our answer

#embody <algorithm>
#embody <climits>
#embody <cstdio>
#embody <random>
#embody <vector>

Describe(Assessments)
{
    It(BasicTest)
    {
        lengthy anticipated = 13;
        lengthy precise = sumTwoSmallestNumbers({ 5, 8, 12, 19, 22 });
        Assert::That(precise, Is().EqualTo(anticipated));
    }
    
    It(ExtendedTest1)
    {
        lengthy anticipated = 6;
        lengthy precise = sumTwoSmallestNumbers({ 15, 28, 4, 2, 43 });
        Assert::That(precise, Is().EqualTo(anticipated));
    }
    
    It(ExtendedTest2)
    {
        lengthy anticipated = 10;
        lengthy precise = sumTwoSmallestNumbers({ 3, 87, 45, 12, 7 });
        Assert::That(precise, Is().EqualTo(anticipated));
    }
    
    It(ExtendedTest3)
    {
        lengthy anticipated = 4000000000;
        lengthy precise = sumTwoSmallestNumbers({ 2000000000, 2000000000, 2000000000, 2000000000, 2000000000 });
        Assert::That(precise, Is().EqualTo(anticipated));
    }

    It(ExtendedTest4)
    {
        lengthy anticipated = 5;
        lengthy precise = sumTwoSmallestNumbers({ 1000, 2, 3 });
        Assert::That(precise, Is().EqualTo(anticipated));
    }

  
    It(RandomTests)
    {
        auto answer = [](std::vector<int> numbers) {
            std::type(numbers.start(), numbers.finish());
            return (lengthy)numbers[0] + (lengthy)numbers[1];
        };
        
        std::default_random_engine generator{std::random_device()()};
        std::uniform_int_distribution<int> distributor(1, INT_MAX);
        std::uniform_int_distribution<std::vector<int>::size_type> sizeDistribution(4, 20);
        
        for(int i = 0; i < 100; i++) {
            int size = sizeDistribution(generator);
            
            std::printf("Check for:n");
            std::vector<int> numbers;
            for(int j = 0; j < size; j++) {
                int n = distributor(generator);
                numbers.push_back(n);
                
                std::printf("%d", n);
                
                if (j != size - 1) {
                    std::printf(", ");
                }
            }
            std::printf("n<hr>n");
            lengthy anticipated = answer(numbers);
            lengthy precise = sumTwoSmallestNumbers(numbers);
            Assert::That(precise, Is().EqualTo(anticipated));
        }
    }
};
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