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  1. Practice
  2. Data Structures
  3. Arrays
  4. 2D Array - DS
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2D Array - DS

  • pa1v_kar + 4 comments

    could anyone identify the mistake

    int main(){
    int arr[6][6];
    for(int arr_i = 0; arr_i < 6; arr_i++){
       for(int arr_j = 0; arr_j < 6; arr_j++){
          
          scanf("%d",&arr[arr_i][arr_j]);
       }
    }
    int sum[30];
    int x=0;
    int arr_i,arr_j;
    int largest;
    
    for(arr_i=0;arr_i<3;arr_i++)
    {
        sum[x]=0;
        int count=0;
        for(arr_j=arr_i;count<3;arr_j++)
        {
            if(count==0)
            {
                  sum[x]+=arr[arr_i+1][arr_j+1];
            }
            sum[x]+=arr[arr_i][arr_j];
            sum[x]+=arr[arr_i+2][arr_j];
            
            ++count;
        }
          
        ++x;
     }
     largest=sum[0];
    for(int i=1;i<=x;i++)
    {   
        if(largest<sum[i])
            largest=sum[i];
    }
    printf("%d",largest);
    return 0;
}
    • Nidheesh_P + 2 comments

      in for loop try i<4 instead of i<3

      • manny_capacidade + 1 comment

        Whats the reason behind i<4..Not able to get the reason.Can you explain please

        • fhasson91 + 0 comments

          there are 4 hourglasses vertically and 4 hourglasses horizontally

      • sakshi_munya + 0 comments

        Thanks a lottt.....Nidheesh.

    • uniquechhetrii + 2 comments
      for(arr_i=0;arr_i<3;arr_i++)
    {
        sum[x]=0;
        int count=0;
        for(arr_j=arr_i;count<3;arr_j++)
        {
            if(count==0)
            {
                  sum[x]+=arr[arr_i+1][arr_j+1];
            }
            sum[x]+=arr[arr_i][arr_j];
            sum[x]+=arr[arr_i+2][arr_j];
            
            ++count;
        }
          
        ++x;

      I didnt understand this part. Can somebody help me out in this?

      • chadams + 0 comments

        His algorithm is getting the middle element of the hourglass on the first pass through and then incrementing the top and bottom rows of the hourglass. He increments count to track the amount of loops needed to read a hourglass and increments x to correspond to the position in the hourglass; 0,1,2 respectively.

      • vigneshiyer66661 + 0 comments
        [deleted]
    • rachehua + 0 comments

      If this is C++, how come the code is all in main function and not in the function they told us to write it as?

    • kmerotha1996 + 0 comments

      int hourglassSum(vector> arr) { int i,j,sum=0,x=0,p=-50,count=0; for(i=0;i<4;i++){ sum=0; for(j=0;j<4;j++){ sum=arr[i+1][j+1]+arr[i][j+1]+arr[i][j+2]+arr[i][j]+arr[i+2][j]+arr[i+2][j+1]+arr[i+2][j+2]; if(p } return(p); }