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            C語言面試算法題附答案

            時間:2024-07-10 02:19:25 嵌入式培訓 我要投稿
            • 相關推薦

            2016年C語言面試算法題(附答案)

              1.求組合數: 求n個數(1....n)中k個數的組合....

            2016年C語言面試算法題(附答案)

              如:combination(5,3)

              要求輸出:543,542,541,532,531,521,432,431,421,321,

              /*

              求組合數: 求n個數(1....n)中k個數的組合....

              如:combination(5,3)

              要求輸出:543,542,541,532,531,521,432,431,421,321,

              */

              #include

              #include

              int pop(int *);

              int push(int );

              void combination(int ,int);

              int stack[3]={0};

              int top = -1;

              int main()

              {

              int n,m;

              n = 5;

              m = 3;

              combination(n,m);

              printf("\n");

              }

              void combination(int m,int n)

              {

              int temp = m;

              push(temp);

              while(1)

              {

              if(1==temp)

              {

              if(pop(&temp) && stack[0]==n)

              break;

              }

              else if(push(--temp))

              {

              printf("%d%d%d\n",stack[0],stack[1],stack[2]);

              pop(&temp);

              }

              }

              }

              int push(int i)

              {

              stack[++top]=i;

              if(top<2)

              return 0;

              else

              return 1;

              }

              int pop(int *i)

              {

              *i = stack[top--];

              if(top>=0)

              return 0;

              else

              return 1;

              }

              2.、用指針的方法,將字符串“ABCD1234efgh”前后對調顯示

              #include

              #include

              int main()

              {

              char str[]="ABCD123efgh";

              int length = strlen(str);

              char *p1= str;

              char *p2 = str+length -1;

              while(p1

              {

              char c = *p1;

              *p1 = *p2;

              *p2 = c;

              ++p1;

              --p2;

              }

              printf("str now is %s\n",str);

              return 1;

              }

              3.給定字符串A和B,輸出A和B中的最大公共子串。比如A="aocdfe" B="pmcdfa" 則輸出"cdf"

              #include

              #include

              #include

              char *commanstring(char shortstring[],char longstring[])

              {

              int i,j;

              char *substring = malloc(256);

              if(strstr(longstring,shortstring)!=NULL)

              return shortstring;

              for(i=strlen(shortstring)-1;i>0;i--)

              {

              for(j=0;j<=strlen(shortstring)-i;j++)

              {

              memcpy(substring,&shortstring[j],i);

              substring[i]='\0';

              if(strstr(longstring,substring)!=NULL)

              return substring;

              }

              }

              return NULL;

              }

              void main(void)

              {

              char *str1 = "aocdfe";

              char *str2 = "pmcdfa";

              char *comman = NULL;

              if(strlen(str1)>strlen(str2))

              comman= commanstring(str2,str1);

              else

              comman = commanstring(str1,str2);

              printf("the longest comman string is:%s\n",comman);

              }

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