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  1. Practice
  2. Algorithms
  3. Implementation
  4. Beautiful Days at the Movies
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Beautiful Days at the Movies

  • jluisg_23 + 0 comments

    I did it using conversion to string, but now that I see your solution, yours is simpler and faster. I share mine anyways:

    #include <stdio.h>
#include <stdlib.h>

int reversed(int a)
{
    char c, *ptr_b, *ptr_e;
    char buff[12];
    int b;
    
    //Integer to string
    sprintf(buff, "%d", a);
    
    //Reversing string
    ptr_b = buff;
    ptr_e = buff;
    while(*ptr_e){           //Moving ptr_e to point the last char in the string
        ++ptr_e;
    }
    --ptr_e;
    while(ptr_b < ptr_e){  //Reversing
        c = *ptr_b;
        *ptr_b = *ptr_e;
        *ptr_e = c;
        ++ptr_b;
        --ptr_e;
    }
    
    //String to integer
    sscanf(buff, "%d", &b);
    
    return b;
}


int main()
{
    int i, j, k, rev, diff, count = 0;
    
    //Input
    scanf("%d %d %d", &i, &j, &k);
    
    //Counting
    for(int ii = i; ii <= j; ++ii){
        rev = reversed(ii);
        diff = abs(ii-rev);
        if(diff%k == 0) ++count;
    }

    //Output
    printf("%d\n", count);
    
    return 0;
}