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string hash

Curious Chamois answered on July 28, 2021 Popularity 10/10 Helpfulness 3/10

answer string hash

related String hashCode() Method

string hash

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long long compute_hash(string const& s) {
    const int p = 53;
    const int m = 1e9 + 9;
    long long hash_value = 0;
    long long p_pow = 1;
    for (char c : s) {
        hash_value = (hash_value + (c - 'a' + 1) * p_pow) % m;
        p_pow = (p_pow * p) % m;
    }
    return hash_value;
}

Popularity 10/10 Helpfulness 3/10 Language cpp

Source: cp-algorithms.com

Tags: c++ hash string

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Contributed on Jul 28 2021

Curious Chamois

0 Answers Avg Quality 2/10

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String hashCode() Method

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public int hashCode() {
    // The hash or hashIsZero fields are subject to a benign data race,
    // making it crucial to ensure that any observable result of the
    // calculation in this method stays correct under any possible read of
    // these fields. Necessary restrictions to allow this to be correct
    // without explicit memory fences or similar concurrency primitives is
    // that we can ever only write to one of these two fields for a given
    // String instance, and that the computation is idempotent and derived
    // from immutable state

    int h = hash;
    if (h == 0 && !hashIsZero) {
        h = isLatin1() ? StringLatin1.hashCode(value)
                       : StringUTF16.hashCode(value);
        if (h == 0) {
            hashIsZero = true;
        } else {
            hash = h;
        }
    }
    return h;
}

Popularity 9/10 Helpfulness 1/10 Language java

Source: howtodoinjava.com

Tags: java string strin

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Contributed on Dec 30 2022

Deepika Sahu

0 Answers Avg Quality 2/10

string hash

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string hash

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String hashCode() Method

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