C++ 中单向链表中最小和最大质数。
问题陈述
给定一个包含 n 个正整数的链表。我们需要找出最小值和最大值质数。
如果给定链表为 -
10 -> 4 -> 1 -> 12 -> 13 -> 7 -> 6 -> 2 -> 27 -> 33 then minimum prime number is 2 and maximum prime number is 13
算法
1. Find maximum number from given number. Let us call it maxNumber 2. Generate prime numbers from 1 to maxNumber and store them in a dynamic array 3. Iterate linked list and use dynamic array to find prime number with minimum and maximum value
示例
#include <iostream> #include <vector> #include <climits> #include <algorithm> #include <list> #define SIZE(arr) (sizeof(arr) / sizeof(arr[0])) using namespace std; void printMinAndMaxPrimes(list<int> intList){ int maxNumber = *max_element(intList.begin(), intList.end()); vector<bool> primes(maxNumber + 1, true); primes[0] = primes[1] = false; for (int p = 2; p * p <= maxNumber; ++p) { if (primes[p]) { for (int i = p * 2; i <= maxNumber; i +=p) { primes[i] = false; } } } int minPrime = INT_MAX; int maxPrime = INT_MIN; for (auto it = intList.begin(); it != intList.end(); ++it) { if (primes[*it]) { minPrime = min(minPrime, *it); maxPrime = max(maxPrime, *it); } } cout << "Prime number of min value = " << minPrime << "\n"; cout << "Prime number of max value = " << maxPrime << "\n"; } int main(){ int arr [] = {10, 4, 1, 12, 13, 7, 6, 2, 27, 33}; list<int> intList(arr, arr + SIZE(arr)); printMinAndMaxPrimes(intList); return 0; }
输出
编译并执行以上程序后,将生成以下输出 -
Prime number of min value = 2 Prime number of max value = 13
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