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ShusenTang 2020-07-04 20:04:42 +08:00 committed by GitHub
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commit d75905bfbe
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1 changed files with 7 additions and 6 deletions
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13
solutions/204. Count Primes.md
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@ -37,14 +37,15 @@ public:
class Solution {
public:
int countPrimes(int n) {
vector<unsigned int>nums(n, 1); // 0代表被划去，1代表没被划去
int count = 0;
vector<bool>Prime(n + 1, true);
int res = 0;
for(int i = 2; i < n; i++){
if(nums[i] == 0) continue;
count++;
for(int j = 2; j * i < n; j++) nums[j * i] = 0;
if(Prime[i]){
res++;
for(int j = i; j <= n / i; j++) Prime[i*j] = false;
}
return count;
}
return res;
}
};
```