# SSEC-Coding Contest Problem 3

## Editorial For SSEC-Coding Contest

SSEC0003

Author: Pavan Kumar

## Problem:

Write a code for Sum of Tri-diagonal Matrix and print both the sum and Tri-diagonal Matrix , take input of valid number which does not come in 0th place, and the matrix should be a square matrix. For better understanding take matrix size greater than [5][5] .

Example :-

1. Tri-diagonal Matrix
``````1       2       0       0       0
3       4       5       0       0
0       6       7       8       0
0       0       9       10      11
0       0       0       12      13
``````
1. Sum = 91

5
5
1
2
3
4
5
6
7
8
9
10
11
12
13

## Sample Output:

``````1       2       0       0       0
3       4       5       0       0
0       6       7       8       0
0       0       9       10      11
0       0       0       12      13
``````

91

## Solution:

```#include<stdio.h>
#include<math.h>

main()
{
int a[50][50],i,j,m,n,sum=0;
scanf("%d",&m);
scanf("%d",&n);

for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
if(abs(i-j)>1)
{
continue;
}
else
{
scanf("%d",&a[i][j]);
while(a[i][j]==0)
{
scanf("%d",&a[i][j]);
}
}
}
}
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
if(abs(i-j)>1)
{
printf("0\t");
}
else
{
printf("%d\t",a[i][j]);
sum=sum+a[i][j];
}

}
printf("\n");
}
printf("\n %d",sum);
return 0;
}
}```