Luzhiled's Library

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:warning: string/z-algorithm.cpp

Code

vector< int > z_algorithm(const string &s) {
  vector< int > prefix(s.size());
  for(int i = 1, j = 0; i < s.size(); i++) {
    if(i + prefix[i - j] < j + prefix[j]) {
      prefix[i] = prefix[i - j];
    } else {
      int k = max(0, j + prefix[j] - i);
      while(i + k < s.size() && s[k] == s[i + k]) ++k;
      prefix[i] = k;
      j = i;
    }
  }
  prefix[0] = (int) s.size();
  return prefix;
}
#line 1 "string/z-algorithm.cpp"
vector< int > z_algorithm(const string &s) {
  vector< int > prefix(s.size());
  for(int i = 1, j = 0; i < s.size(); i++) {
    if(i + prefix[i - j] < j + prefix[j]) {
      prefix[i] = prefix[i - j];
    } else {
      int k = max(0, j + prefix[j] - i);
      while(i + k < s.size() && s[k] == s[i + k]) ++k;
      prefix[i] = k;
      j = i;
    }
  }
  prefix[0] = (int) s.size();
  return prefix;
}
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