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      1. 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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