Algoritmo ingenuo para la búsqueda de patrones – Part 1

Dado un texto txt[0..n-1] y un patrón pat[0..m-1] , escriba una función search(char pat[], char txt[]) que imprima todas las apariciones de pat[] en txt [] . Puede suponer que n > m . 
Ejemplos: 

Input:  txt[] = "THIS IS A TEST TEXT"
        pat[] = "TEST"
Output: Pattern found at index 10

Input:  txt[] =  "AABAACAADAABAABA"
        pat[] =  "AABA"
Output: Pattern found at index 0
        Pattern found at index 9
        Pattern found at index 12

// C program for Naive Pattern Searching algorithm
#include <stdio.h>
#include <string.h>
 
void search(char* pat, char* txt)
{
    int M = strlen(pat);
    int N = strlen(txt);
 
    /* A loop to slide pat[] one by one */
    for (int i = 0; i <= N - M; i++) {
        int j;
 
        /* For current index i, check for pattern match */
        for (j = 0; j < M; j++)
            if (txt[i + j] != pat[j])
                break;
 
        if (j == M) // if pat[0...M-1] = txt[i, i+1, ...i+M-1]
            printf("Pattern found at index %d \n", i);
    }
}
 
/* Driver program to test above function */
int main()
{
    char txt[] = "AABAACAADAABAAABAA";
    char pat[] = "AABA";
    search(pat, txt);
    return 0;
}

// C++ program for Naive Pattern
// Searching algorithm
#include <bits/stdc++.h>
using namespace std;
 
void search(char* pat, char* txt)
{
    int M = strlen(pat);
    int N = strlen(txt);
 
    /* A loop to slide pat[] one by one */
    for (int i = 0; i <= N - M; i++) {
        int j;
 
        /* For current index i, check for pattern match */
        for (j = 0; j < M; j++)
            if (txt[i + j] != pat[j])
                break;
 
        if (j == M) // if pat[0...M-1] = txt[i, i+1, ...i+M-1]
            cout << "Pattern found at index "
                 << i << endl;
    }
}
 
// Driver Code
int main()
{
    char txt[] = "AABAACAADAABAAABAA";
    char pat[] = "AABA";
    search(pat, txt);
    return 0;
}
 
// This code is contributed
// by Akanksha Rai

// Java program for Naive Pattern Searching
 
public class NaiveSearch {
 
    static void search(String pat,String txt){
        int l1=pat.length();
        int l2=txt.length();
        int i=0,j=l2-1;
         
        for(i=0,j=l2-1;j<l1;){
             
            if(txt.equals(pat.substring(i,j+1))){
                System.out.println("Pattern found at index "+i);
                
            }
                i++;
                j++;
        }
    }
             
             
    public static void main(String args[]){
        String pat="AABAACAADAABAAABAA";
        String txt="AABA";
         
        search(pat,txt);
    }
}
// This code is contributed by D. Vishnu Rahul Varma

# Python3 program for Naive Pattern
# Searching algorithm
def search(pat, txt):
    M = len(pat)
    N = len(txt)
 
    # A loop to slide pat[] one by one */
    for i in range(N - M + 1):
        j = 0
         
        # For current index i, check
        # for pattern match */
        while(j < M):
            if (txt[i + j] != pat[j]):
                break
            j += 1
 
        if (j == M):
            print("Pattern found at index ", i)
 
# Driver Code
if __name__ == '__main__':
    txt = "AABAACAADAABAAABAA"
    pat = "AABA"
    search(pat, txt)
 
# This code is contributed
# by PrinciRaj1992

// C# program for Naive Pattern Searching
using System;
 
class GFG {
 
    public static void search(String txt, String pat)
    {
        int M = pat.Length;
        int N = txt.Length;
 
        /* A loop to slide pat one by one */
        for (int i = 0; i <= N - M; i++) {
            int j;
 
            /* For current index i, check for pattern
            match */
            for (j = 0; j < M; j++)
                if (txt[i + j] != pat[j])
                    break;
 
            // if pat[0...M-1] = txt[i, i+1, ...i+M-1]
            if (j == M)
                Console.WriteLine("Pattern found at index " + i);
        }
    }
 
    // Driver code
    public static void Main()
    {
        String txt = "AABAACAADAABAAABAA";
        String pat = "AABA";
        search(txt, pat);
    }
}
// This code is Contributed by Sam007

<?php
// PHP program for Naive Pattern
// Searching algorithm
 
function search($pat, $txt)
{
    $M = strlen($pat);
    $N = strlen($txt);
 
    // A loop to slide pat[]
    // one by one
    for ($i = 0; $i <= $N - $M; $i++)
    {
 
        // For current index i,
        // check for pattern match
        for ($j = 0; $j < $M; $j++)
            if ($txt[$i + $j] != $pat[$j])
                break;
 
        // if pat[0...M-1] =
        // txt[i, i+1, ...i+M-1]
        if ($j == $M)
            echo "Pattern found at index ", $i."\n";
    }
}
 
    // Driver Code
    $txt = "AABAACAADAABAAABAA";
    $pat = "AABA";
    search($pat, $txt);
     
// This code is contributed by Sam007
?>

<script>
    // Javascript program for Naive Pattern Searching
     
    function search(txt, pat)
    {
        let M = pat.length;
        let N = txt.length;
   
        /* A loop to slide pat one by one */
        for (let i = 0; i <= N - M; i++) {
            let j;
   
            /* For current index i, check for pattern
            match */
            for (j = 0; j < M; j++)
                if (txt[i + j] != pat[j])
                    break;
   
            // if pat[0...M-1] = txt[i, i+1, ...i+M-1]
            if (j == M)
                document.write("Pattern found at index " + i + "</br>");
        }
    }
     
    let txt = "AABAACAADAABAAABAA";
    let pat = "AABA";
    search(txt, pat);
                                
</script>

txt[] = "AABCCAADDEE";
pat[] = "FAA";

txt[] = "AAAAAAAAAAAAAAAAAA";
pat[] = "AAAAA";

txt[] = "AAAAAAAAAAAAAAAAAB";
pat[] = "AAAAB";