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

Beautiful Days at the Movies

  • Aswath3167 + 4 comments

    My C Solution......

    #include<stdio.h>
int main()
{
int i=0,j=0,k=0,x=0,rem=0,sum=0,count=0;
scanf("%d%d%d",&i,&j,&k);
for(i;i<=j;i++)
{
x=i;
while(x!=0)
{
rem=x%10;
sum=(sum*10)+rem;
x=x/10;
}
if(abs(i-sum)%k==0)
count=count+1;
sum=0;
}
printf("%d",count);
return 0;
}

    • UtkarshSWG + 2 comments

      my code isnt working..please tell me why

      int main() {
    
    long int i=0,j=0,k=0,m=0,x=0,d=0,r=0;
    cin>>i>>j>>k;
    for(m=i;m<=j;m++)
    {
        r=0;
        while(m!=0)
        {
            d=m%10;
            r=r*10+d;
            m=m/10;
        }
        if((abs(r-m)%k)==0)
            x++;
    }
    cout<<x;
    return 0;
}

      • non_programmer + 1 comment

        Dude, you are using same m in your code... which will keep on becoming zero after completion from while loop and it will never be equal to j, better try out with this:

        include

        include

        using namespace std; int main() {

        long int i=0,j=0,k=0,m=0,x=0,d=0,r=0,m1=0;
cin>>i>>j>>k;
for(m=i;m<=j;m++)
{
    r=0;
    m1=m;
    while(m1!=0)
    {
        d=m1%10;
        r=r*10+d;
        m1=m1/10;
    }
    if((abs(r-m)%k)==0)
        x++;
}
cout<<x;
return 0;

        } I hope you got what's wrong.

        • UtkarshSWG + 0 comments

          thanks dude...I got it

      • nayan_7991 + 0 comments

        in this when the loop run for the first time the vue of m becomes 0. so we again give the value of i to m and so Infinite loop runs

    • yashwant97 + 0 comments

      sum=(sum*10)+rem; i dint understand this line can u pls help me out?

    • 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;
}

    • AGRAWALTUSHAR27 + 0 comments

      Thanks man! You have cleared my confusion.