1.5.2 Prime Palindromes
2010-08-19 10:53
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/* ID: zhangzz4 PROG: pprime LANG: C++ */ #include<stdio.h> #include<stdlib.h> int a,b; int ok(int x) { if(x<a||x>b) return 0; if(x<2) return 0; for(int i=2;i*i<=x;i++) if(x%i==0) return 0; return 1; } int cmp(const void *a,const void *b) { return *(int *)a-*(int *)b; } int f[1000000],cnt; int main() { freopen("pprime.in","r",stdin); freopen("pprime.out","w",stdout); scanf("%d%d",&a,&b); int num=0; for(int d1=0;d1<=9;d1++) { num=d1; if(ok(num)) f[cnt++]=num; num=d1*10+d1; if(num>9&&ok(num)) f[cnt++]=num; for(int d2=0;d2<=9;d2++) { num=d1*100+d2*10+d1; if(num>99&&ok(num)) f[cnt++]=num; num=d1*1000+d2*100+d2*10+d1; if(num>999&&ok(num)) f[cnt++]=num; for(int d3=0;d3<=9;d3++) { num=d1*10000+d2*1000+d3*100+d2*10+d1; if(num>9999&&ok(num)) f[cnt++]=num; num=d1*100000+d2*10000+d3*1000+d3*100+d2*10+d1; if(num>99999&&ok(num)) f[cnt++]=num; for(int d4=0;d4<=9;d4++) { num=d1*1000000+d2*100000+d3*10000+d4*1000+d3*100+d2*10+d1; if(num>999999&&ok(num)) f[cnt++]=num; num=d1*10000000+d2*1000000+d3*100000+d4*10000+d4*1000+d3*100+d2*10+d1; if(num>9999999&&ok(num)) f[cnt++]=num; for(int d5=0;d5<=9;d5++) { num=d1*100000000+d2*10000000+d3*1000000+d5*100000+d4*10000+d4*1000+d3*100+d2*10+d1; if(num>99999999&&ok(num)) f[cnt++]=num; } } } } } qsort(f,cnt,sizeof(f[0]),cmp); for(int i=0;i<cnt;i++) printf("%d/n",f[i]); }
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