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694 - The Collatz Sequence

#include <stdio.h> int main() { long A,L; long n=1; while(scanf("%ld%ld",&A,&L)==2) { long count=0; if(A<0 && L<0) break; for(;;) { count++; if(A==1) break; else if(A%2) { A=3*A+1; if(A>L) break; } else A=A/2; } printf("Case %d: A = %ld, limit = %ld, number of terms = %ld\n",n++,A,L,count); } return 0; }

401-Palindromes

/*#include <stdio.h> #include <string.h> #include <ctype.h> char p[2][50]= { "ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789", "A 3 HIL JM O 2TUVWXY51SE Z 8 " }; char str[1000]; int f(int n) { int isreg,ismir,i; isreg=1; ismir=1; for(i=0;i<(n-1)/2 && isreg==1;i++) { if(str[i]!=str[n-1-i]) isreg=0; } for(i=0;i<(n-1)/2 && ismir==1;i++) { if(isdigit(str[i])) { if(p[1][str[i]-'1'+26]!=str[n-1-i]) ismir=0; } else { if(p[1][str[i]-'A']!=str[n-1-i]) ismir=0; } } if(isreg==0 && ismir==0) return 0; else if(isreg==1 && ismir==0) return 1; else if(isreg==0 && ismir==1) return 2; else if(isreg==1 && ismir==1) return 3; return -1; } int main() { while(scanf("%s",str)!=EOF) { int len; len=strlen(str); for(int i=0;i<len;i++) if(str[i]=='0') str[i]='o'; switch(f(len)) { case 0: printf("%s -- is not a palindrome.\n",str); break; case 1: printf("%s -- is a regular palindrome.\n",str); break; case 2: printf("%s -- is a mirrored string.\n",str); break; case 3: printf("%s -- is a mirrored palindrome.\n",str); break; default: break; } printf("\n"); } return 0; }*/ #include<stdio.h> #include<string.h> const char one[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789"; const char two[]="A 3 HIL JM O 2TUVWXY51SE Z 8 "; const long len=35; bool Palindrome(const char *s) { long begin=0,end=strlen(s)-1; while(begin<=end) { if(s[begin]==s[end]) { begin++; end--; } else return false; } return true; } long pos(char ch) { for(long i=0;i<len;i++) if(one[i]==ch) return i; return len; } bool Mirror(const char *s) { long begin=0,end=strlen(s)-1; while(begin<=end) { long tmp=pos(s[begin]); if(s[end]==two[tmp]) { begin++; end--; } else return false; } return true; } int main() { char str[1000]; while(gets(str)!=0) { bool a=false,b=false; a=Palindrome(str); b=Mirror(str); if(a&&b) printf("%s -- is a mirrored palindrome.\n",str); else if(a) printf("%s -- is a regular palindrome.\n",str); else if(b) printf("%s -- is a mirrored string.\n",str); else printf("%s -- is not a palindrome.\n",str); putchar('\n'); } return 0; }