leetcode Count Primes
Count Primes 題目:https://leetcode.com/problems/count-primes/
計算質數的個數:
public static void main(String[] args) { int n=10; int nums = countPrimes(n); System.out.println(nums); } public static int countPrimes(int n) { if(n<2){ return 0; } boolean[] arr=new boolean[n]; arr[0]=true; arr[1]=true; for(int i=2;i<n;i++){ if(!arr[i]){ for(int j=2*i;j<n;j+=i){ arr[j]=true; } } } int count=0; for(int i=0;i<arr.length;i++){ if(!arr[i]){ count++; } } return count; }
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