C++ Program to Find the Length of Longest Common Substring

This C++ Program finds Length of Longest Common Substring.

Here is source code of the C++ Program to Find Length of Longest Common Substring. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Find Length of Longest Common Substring

```
 */
```
```
#include<iostream>
```
```
#include<cstring>
```
```
using namespace std;
```
```
 
```

// A utility function to find maximum of two integers

```
int max(int a, int b)
```
```
{
```
```
    return (a > b)? a : b;
```
```
}
```
```
 
```

/* Returns length of longest common substring of X[0..m-1] and Y[0..n-1] */

int LCSubStr(char *X, char *Y, int m, int n)

```
{
```
```
    int LCSuff[m + 1][n + 1];
```
```
    int result = 0;
```
```
    for (int i = 0; i <= m; i++)
```
```
    {
```
```
        for (int j=0; j<=n; j++)
```
```
        {
```
```
            if (i == 0 || j == 0)
```
```
                LCSuff[i][j] = 0;
```
```
            else if (X[i-1] == Y[j-1])
```
```
            {
```

                LCSuff[i][j] = LCSuff[i-1][j-1] + 1;

                result = max(result, LCSuff[i][j]);

```
            }
```
```
            else LCSuff[i][j] = 0;
```
```
        }
```
```
    }
```
```
    return result;
```
```
}
```
```
 
```
```
/*Main */
```
```
int main()
```
```
{
```
```
    char X[] = "Sanfoundry";
```
```
    char Y[] = "foundation";
```
```
    int m = strlen(X);
```
```
    int n = strlen(Y);
```

    cout << "Length of Longest Common Substring is " << LCSubStr(X, Y, m, n);

```
    return 0;
```
```
}
```

$ g++ lcs.cpp
$ a.out
 
Length of Longest Common Substring is 5
 
------------------
(program exited with code: 1)
Press return to continue

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