include <bits/stdc++.h>

bool check(int x) {
int len = 0,b = x,c = x;
for (;b;len++) b /= 10;
if(!len%2) return false;
int a[101];
if (!x%2) return false;
memset(a,0,sizeof(a));
for(int i = 1;i <= len;i++) {
a[i] = x%10;
x /= 10;
}
for (int i = 1;i <= (len+1)/2;i++)
if (a[i] != a[len+1-i]) return false;
for (int i = 2;i <= sqrt(c);i++)
if(c%i==0) return false;
return true;
}
int main() {
int L,R;
scanf("%d%d",&L,&R);
R = std :: min(R,10000000);
for (int i = L;i <= R;i++)
if (check(i)) printf("%d\n",i);
return 0;
}

这是搞事情（滑稽）为什么还会有人在这鬼地方待下去

#include <bits/stdc++.h>
bool check(int x) {
int len = 0,b = x,c = x;
for (;b;len++) b /= 10;
if(!len%2) return false;
int a[101];
if (!x%2) return false;
memset(a,0,sizeof(a));
for(int i = 1;i <= len;i++) {
a[i] = x%10;
x /= 10;
}
for (int i = 1;i <= (len+1)/2;i++)
if (a[i] != a[len+1-i]) return false;
for (int i = 2;i <= sqrt(c);i++)
if(c%i==0) return false;
return true;
}
int main() {
int L,R;
scanf("%d%d",&L,&R);
R = std :: min(R,10000000);
for (int i = L;i <= R;i++)
if (check(i)) printf("%d\n",i);
return 0;
}

坑啊。

编译成功

测试数据 #0: Accepted, time = 15 ms, mem = 556 KiB, score = 10
测试数据 #1: Accepted, time = 0 ms, mem = 552 KiB, score = 10
测试数据 #2: Accepted, time = 15 ms, mem = 556 KiB, score = 10
测试数据 #3: Accepted, time = 31 ms, mem = 560 KiB, score = 10
测试数据 #4: Accepted, time = 0 ms, mem = 556 KiB, score = 10
测试数据 #5: Accepted, time = 0 ms, mem = 556 KiB, score = 10
测试数据 #6: Accepted, time = 343 ms, mem = 556 KiB, score = 10
测试数据 #7: Accepted, time = 296 ms, mem = 556 KiB, score = 10
测试数据 #8: Accepted, time = 0 ms, mem = 556 KiB, score = 10
测试数据 #9: Accepted, time = 343 ms, mem = 556 KiB, score = 10
Accepted, time = 1043 ms, mem = 560 KiB, score = 100