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33 lines
678 B
33 lines
678 B
#include<bits/stdc++.h>
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using namespace std;
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const int N = 1e8 + 10;
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//判断一个数是不是质数
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bool isPrime(int n) {
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if (n < 2) return false;
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for (int i = 2; i <= n / i; i++)
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if (n % i == 0) return false;
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return true;
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}
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//回文数的判定
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bool isHWS(int x) {
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int t = x, ans = 0;
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while (t) {
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ans = ans * 10 + t % 10;
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t /= 10;
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}
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return ans == x;
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}
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int main() {
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//3个点TLE
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int a, b;
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cin >> a >> b;
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for (int i = a; i <= b; i++)
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if (isPrime(i) && isHWS(i))
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cout << i << endl;//如果既是质数同时也是回文数，就输出。
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return 0;
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} |