kmp algorithm

DontBlameME answered on December 15, 2021 Popularity 10/10 Helpfulness 2/10

answer kmp algorithm

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kmp algorithm

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#define ll long long int
#define vll vector<long long int>

ll kmp(string s)
{
    ll n = s.size();
    vll lps(n, 0); // longest prefix suffix
    for (ll i = 1; i < n; i++)
    {
        ll j = lps[i - 1];
        while (j > 0 && s[i] != s[j])
        {
            j = lps[j - 1];
        }
        if (s[i] == s[j])
        {
            j++;
        }
        lps[i] = j;
    }
    return lps[n - 1];
}

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Tags: algorithm c++

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Contributed on May 20 2022

DontBlameME

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COMPUTE- PREFIX- FUNCTION (P)
 1. m ←length [P]		//'p' pattern to be matched
 2. Π [1] ← 0
 3. k ← 0
 4. for q ← 2 to m
 5. do while k > 0 and P [k + 1] ≠ P [q]
 6. do k ← Π [k]
 7. If P [k + 1] = P [q]
 8. then k← k + 1
 9. Π [q] ← k
 10. Return Π

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Contributed on Dec 15 2021

Tense Tern

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kmp algorithm

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KMP-MATCHER (T, P)
 1. n ← length [T]
 2. m ← length [P]
 3. Π← COMPUTE-PREFIX-FUNCTION (P)
 4. q ← 0		// numbers of characters matched
 5. for i ← 1 to n	// scan S from left to right 
 6. do while q > 0 and P [q + 1] ≠ T [i]
 7. do q ← Π [q]		// next character does not match
 8. If P [q + 1] = T [i]
 9. then q ← q + 1		// next character matches
 10. If q = m			           // is all of p matched?
 11. then print "Pattern occurs with shift" i - m
 12. q ← Π [q]				// look for the next match

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Source: www.javatpoint.com

Tags: algorithm algo

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Contributed on Dec 15 2021

Tense Tern

0 Answers Avg Quality 2/10

kmp algorithm

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