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Repeat Number

2024-07-10 05:04:08   222人阅读

Problem B: Repeat Number

Time Limit: 1 Sec  Memory Limit: 32 MB

Description

 

Definition: a+b = c, if all the digits of c are same ( c is more than ten)，then we call a and b are Repeat Number. My question is How many Repeat Numbers in [x,y].

 

 

Input

 

There are several test cases.

Each test cases contains two integers x, y(1<=x<=y<=1,000,000) described above.

Proceed to the end of file.

 

 

Output

 

For each test output the number of couple of Repeat Number in one line.

 

 

Sample Input

1 1010 12

Sample Output

52

HINT

 

If a equals b, we can call a, b are Repeat Numbers too, and a is the Repeat Numbers for itself.

 

上代码

#include<stdio.h> int a[123]={    11,22,33,44,55,66,77,88,99,    111,222,333,444,555,666,777,888,999,    1111,2222,3333,4444,5555,6666,7777,8888,9999,    11111,22222,33333,44444,55555,66666,77777,88888,99999,    111111,222222,333333,444444,555555,666666,777777,888888,999999,    1111111,2222222,3333333,4444444,5555555,6666666,7777777,8888888,9999999}; int lower_bound(int *array, int size, int key){    int first = 0, middle;    int half, len;    len = size;     while(len > 0) {        half = len >> 1;        middle = first + half;        if(array[middle] < key) {                 first = middle + 1;                      len = len-half-1;        }        else            len = half;    }    return first;} int main(){    int x,y,i,mid;    while(~scanf("%d%d",&x,&y))    {        int p=lower_bound(a,54,2*x);        int q=lower_bound(a,54,2*y);        int ans=0;        if(a[q]>2*y) q--;        for(i=p;i<=q;i++)        {            mid = a[i]/2;            if (a[i]%2==0)            {                if(mid-x < y-mid)                    ans+=mid-x+1;                else                    ans+=y-mid+1;            }            else            {                if(mid-x+1 < y-mid)                    ans+=mid-x+1;                else                    ans+=y-mid;            }        }        printf("%d\n",ans);    }    return 0;}/**************************************************************    Problem: 2    User: hui    Language: C    Result: 正确    Time:0 ms    Memory:964 kb****************************************************************/

 

 


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