class Solution {
int count=0;
public int countPrimes(int n) {
for(int i=2;i<n;i++){
if(check(i)){
count++;
}
}
return count;
}
private static boolean check(int n){//思路最簡單,先這樣做吧,以後再優化
for(int i=2;i*i<=n;i++)
if(n%i==0) return false;
return true;
}
}
LeetCode204計數質數
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