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/* 學號:U9824017 姓名:戴均民 題號:p548-3 日期:981225 */ #include<stdio.h> int fa(int ia,int ib) { if(ia<0 || ib<0)return ia-ib; return fa(ia-1,ib)+fa(ia,ib-1); } int main() { int ia,ib; while(scanf("%d %d",&ia,&ib)!=EOF) { printf("%d\n",fa(ia,ib)); } }
/* 學號:U9824017 姓名:戴均民 題號:p548-4 日期:981225 */ #include<stdio.h> #include<string.h> int two_ele_subs(char ca[10000],int ia=-1,int ib=0) { ib++; for(int i=ia+1; i<strlen(ca); i++) { if(ib==2)printf("{%c , %c}\n",ca[ia] ,ca[i] ); else two_ele_subs(ca,i,ib); } } int main() { char ca[10000]; while( scanf("%s",ca )!=EOF ) two_ele_subs(ca); }