leetcode 204. Count Primes
題目描述
註意：1既不是素數也不是合數
可以通過標記的方法找到所有非素數。
class Solution { public: int countPrimes(int n) { int *tmp = new int[n]; memset(tmp,0,sizeof(int)*n); int count = 0; for(int i = 2; i < n ; i++){ if(tmp[i] == 0){ count ++; for(int j = 2; j*i < n; j++) tmp[i*j]=1; } } return count; } };
leetcode 204. Count Primes
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