# Introduction to programming in C Week 6

**Course Name: Introduction to programming in C**

**Course Link: Click Here**

**These are Introduction to programming in C Assignment 6 Answers**

**Question 1**

#### We say that a string ‘s’ is an anagram of another string ‘t’ if the letters in ‘s’ can be rearranged to form ‘t’.

For example, “butterfly” is an anagram of “flutterby”, since a rearrangement of the first word results in the second.

We say that a position ‘i’ in ‘s’ and ‘t’ match, if ‘s’ is an anagram of ‘t’, and s[i]==t[i].

In this question, you will be given two words, ‘s’ and ‘t’. You have to output the number of matching positions if s is an anagram of t, and -1 if s is not an anagram of t.

**These are Introduction to programming in C Assignment 6 Answers**

__Input__

The input consists of two lines. The first line contains the first string, with length <= 100 characters. The second line contains the second string, with length <= 100 characters.__Output__

If the first string is an anagram of the second string, then output the number of matching positions. Otherwise, print -1.**Sample Input 1**

————–

butterfly

flutterby

Sample Output 1

—————

2

Sample Input 2

————–

home

come

Sample Output 2

—————

-1

**These are Introduction to programming in C Assignment 6 Answers**

**Solution**

```
#include <stdio.h>
#include <string.h>
int main()
{
char s[101], t[101];
int freq_s[26] = {0}, freq_t[26] = {0};
int i, match = 0;
scanf("%s", s);
scanf("%s", t);
if(strlen(s) != strlen(t))
{
printf("-1");
return 0;
}
for(i=0; i<strlen(s); i++)
{
freq_s[s[i]-'a']++;
freq_t[t[i]-'a']++;
}
for(i=0; i<26; i++)
{
if(freq_s[i] != freq_t[i])
{
printf("-1");
return 0;
}
}
for(i=0; i<strlen(s); i++)
{
if(s[i] == t[i])
{
match++;
}
}
printf("%d", match);
return 0;
}
```

**These are Introduction to programming in C Assignment 6 Answers**

**Question 2**

In a string, a “run” is a substring with consisting of consecutive occurrences of the same character. For example, the string “mississippi” contains the following runs – “ss”, “ss” and “pp”.

In this question, given a string, you have to output the length of the longest run in the string.**Input**

A string, having length at most 100. The string is guaranteed to have at least one run.**Output**

The length of the longest run in the string.

Sample Input

abbaaacccc

Sample Output

4

**Solution**

```
#include <stdio.h>
int main()
{
char str[100];
int i, count, max_count;
scanf("%s", str);
count = 1;
max_count = 1;
for(i=1; str[i]!='\0'; i++)
{
if(str[i] == str[i-1])
{
count++;
if(count > max_count)
{
max_count = count;
}
}
else
{
count = 1;
}
}
printf("%d", max_count);
return 0;
}
```

**These are Introduction to programming in C Assignment 6 Answers**

**Question 3**

Given an n×n integer Matrix A and an positive number ℓ such that 2ℓ+1≤n, print the ℓ window smoothing of A.

To get the ℓ-window smoothing of A , we replace A[i][j] with the sum of the values of the 2ℓ+1×2ℓ+1 submatrix of A with centre at A[i][j].

More precisely, the smoothed matrix B[i,j]=∑u=ilih∑v=jljhA[u][v] where il=max(i−ℓ,0),ih=min(i+ℓ,n−1), jl=max(j−ℓ,0),jh=min(j+ℓ,n−1).**Input**

The first line contains the dimension of the matrix n. Assume n < 100. The second line contains the smoothing parameter ℓ.

The next n lines contains the contents of the matrix A, each row per line.**Output**

The smoothed matrix of A

**Solution**

```
#include <stdio.h>
int main()
{
int n, l;
scanf("%d %d", &n, &l);
int A[n][n];
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
{
scanf("%d", &A[i][j]);
}
}
int B[n][n];
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
{
int il = (i - l < 0) ? 0 : i - l;
int ih = (i + l > n - 1) ? n - 1 : i + l;
int jl = (j - l < 0) ? 0 : j - l;
int jh = (j + l > n - 1) ? n - 1 : j + l;
int sum = 0;
for (int u = il; u <= ih; u++)
{
for (int v = jl; v <= jh; v++)
{
sum += A[u][v];
}
}
B[i][j] = sum;
}
}
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
{
printf("%d ", B[i][j]);
}
printf("\n");
}
return 0;
}
```

**These are Introduction to programming in C Assignment 6 Answers**

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**These are Introduction to programming in C Assignment 6 Answers**