src/string/zalgo.hpp

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• Last update: 2020-05-08 21:35:33+09:00
• Include: #include "src/string/zalgo.hpp"

Required by

• src/string/run.hpp

Verified with

• src/run.test.cpp
• src/zalgo.test.cpp

Code

#pragma once

// s[0..r[i]] == s[i..i+r[i]]
template <class S> V<int> z_algo(const S& s) {
    int n = int(s.size());
    V<int> r(n + 1);
    r[0] = 0;
    for (int i = 1, j = 0; i <= n; i++) {
        int& k = r[i];
        k = (j + r[j] <= i) ? 0 : min(j + r[j] - i, r[i - j]);
        while (i + k < n && s[k] == s[i + k]) k++;
        if (j + r[j] < i + r[i]) j = i;
    }
    r[0] = n;
    return r;
}

#line 2 "src/string/zalgo.hpp"

// s[0..r[i]] == s[i..i+r[i]]
template <class S> V<int> z_algo(const S& s) {
    int n = int(s.size());
    V<int> r(n + 1);
    r[0] = 0;
    for (int i = 1, j = 0; i <= n; i++) {
        int& k = r[i];
        k = (j + r[j] <= i) ? 0 : min(j + r[j] - i, r[i - j]);
        while (i + k < n && s[k] == s[i + k]) k++;
        if (j + r[j] < i + r[i]) j = i;
    }
    r[0] = n;
    return r;
}

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