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2012 Dm A0 03 Pdf
Jun 25, 2012
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1.
3.How fast we
can sort 螻 讌 A0 譟 譟一 20063532 譟磯蟯 20073547 讌 20083438 蟾覓願化 20093447 蟾 20093489 ″ 20093516 レ 螻殊 蠍郁 : 4 9 ~ 4 20 (12) 豐 8螳. 譯殊 : How fast can we sort? 覈 : 願骸 譟壱 伎 . 螻. 豌 譯(4 9~15) 螻襴讀 襴 牛 螳 蟯 郁規 螻殊 1 蟯 覓語 願屋 讌語(4 16~20) 譯殊 伎 覈詩 覿覿 殊 螻殊 2 襦蠏碁 るゼ
2.
豌 譯. 4 09
覓企 譟一 : ″ 襭譟一 : 蟾覓願化, 蟾, レ, 襦蠏碁貊 : 譟磯蟯, 讌 牛 伎 The fundamental principle of counting. 殊企 蟇伎 螳讌襯 襷 蟆. 1 殊企 蟇伎 螳讌襯 n企手 蟆曙一 襯 n企手 . sample. r 螳 襦 るジ 譴 譴覲旧 n螳襯 觸 譴襦 危 蟆曙一 . 豕豐 r 螳襯 螻 危 螻 r 螳襯 蠍 覓語 伎 螳 r酔 . selection 襦 るジ n 螳 譴覲旧 渚 r 螳襯 觸 蟆曙一 . 譴覲旧^ nHr r 螳 れ 蟯 危 蟆企. k-permutation 襦 るジ n 螳 譴 r 螳(n>=r)襯 觸 譴襦 語磯 蟆曙一 . nPr 襦 碁. 譴覲旧願骸, , 殊殊 煙 . p(n, r) = n! / (n-r)! k-combination 讌 朱 襯 豬 覿覿讌 襷 蟆 襷. n 螳 襯 螳 讌 讌 k螳 覿覿讌 螻襯企 譟壱 蟆曙一 危螻 覃, nCk襦 碁. 譴覲旧^ . C(n, k) = n! / k!(n-k)!
3.
4 11 螻殊1. 10~29蟾讌
20レ 豺企襯 覦覯 1, 2, 3 磯 貅. 覦覯1. 螳 螳 蟾讌 谿場 豺企襯 企 覃伎 襦 る襦 . 豌覿 れ 蠏 れ 襯 谿場 蠏 豺企 . 螻殊 覈 豺企襯 谿場 蟾讌 覦覲牛. 螳? 豌 豺企襯 覈 覯 覲伎 螳? 豕 20, 豕 190 觜蟲襯 伎狩. 豕 蟆曙磯 企至 豐蠍壱 蟆曙一瑚? 10覿 29朱 螳 襷 觜蟲襯 伎狩. 190 觜蟲襯 牛 蟲 . (20*19 / 2 = 190) 豕 蟆曙磯 企至 豐蠍壱 蟆曙一瑚? 29 10 朱 螳 蟆 觜蟲 . 20 觜蟲襷 覃 . 螳 覲旧° 朱瑚? 螳 覲旧° n螳 螳 n(n-1) / 2企襦 big O O(n族)企. 覦覯2. 豺企襯 覘豺襦 . 豌 螳 1 蟆願 るジ 豌 螳 2瑚企. 螳 覘豺襯 覦覯1 覯讌 襯 . 豌 覯讌 覘豺襯 覯讌 覘豺 . 螳? . 豺企 觜蟲 朱瑚? 110. 豺企 豌襯 觜蟲 螳 20願, 伎 豺企 覘豺襯 覦覯1 覦覯朱 覃 螳螳 10C2螳 覩襦, 45 2覯 讀 90覯 觜蟲襯 . 磯殊 觜蟲 110螳 . 覦覯3 豺企 覯讌 襯 伎 10螳 覘豺(0~9)襦. 伎 覯讌 螳 0 覘豺襯 讌伎 豌 覯讌語襯 覲願 覘豺襦 螻 れ . 覯讌語螳 1 覘豺襯 讌伎 れ 豌 覯讌 襯 覲願 覘豺襦 覘豺 れ . 覈 豺企 覦覲牛. 豺企 觜蟲 朱瑚? 30. 覯讌 襯 る 螻殊 20 觜蟲螳 螻, 豌 覯讌 襯 螻殊 10覯 觜蟲螳 . 磯殊 30 觜蟲螳 .
4.
讌語. 4 18 豕譬
. #include <stdio.h> #include <malloc.h> #include <stdlib.h> void combination(char*, int, int, int, int, int*); // combination func.. int main() { int i,j, number ,*array //i = r , number = n int c=0;// 螳 = n int next =0; int nums = 0; char a[100] = {0}; char *ap = a; char ar[21]={0}; printf("[ex){a,s,d}3] ロ : "); gets(a); printf("input item number: "); for(j=0;j<100;j++) { if((a[j]>=65&&a[j]<=90)||(a[j]>=97&&a[j]<=122)) { ar[next]=a[j]; next++; } else if((a[j]>=48&&a[j]<=57)||a[j]==0) { i=atoi(ap+j);
5.
break
} } while(1)// count 讀螳覿覿 { if(ar[c]==0)break c++;} printf("%dn",c); printf("%d",i); // create memory.. array = (int*)malloc(sizeof(int)*(c+1)); printf("n* %d - combination >n", i); combination(ar, 0, 0, i, c, array); printf("n"); // getch(); free(array); // free memory.. return 0; } // recursive combination function.. void combination(char *ar, int now, int count, int step, int number, int* array) { int i; *(array+count) = now; if (count == step) // search r-combination .. {
6.
printf(" { %c",
ar[*(array+1)-1]); // print frist item.. for (i = 2; i <= count; i++) { printf(", %c", ar[*(array+i)-1]); // print other item.. } printf(" } "); // close.. return ; } // recursive routine.. for (i = now+1; i <= number; i++) { combination(ar, i, count+1, step, number, array); } 蟆郁骸.
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