string/manacher.cpp

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• Last update: 2020-10-27 13:26:46+09:00
• Link: https://snuke.hatenablog.com/entry/2014/12/02/235837

Verified with

• test/aoj/2934.test.cpp

Code

#ifndef call_from_test
#include <bits/stdc++.h>
using namespace std;
#endif
// https://snuke.hatenablog.com/entry/2014/12/02/235837
//BEGIN CUT HERE
vector<int> manacher(string s){
  int n=s.size();
  vector<int> vs(n);
  for(int i=0,j=0;i<n;){
    while(i-j>=0 and i+j<n and s[i-j]==s[i+j]) j++;
    vs[i]=j;
    int k=1;
    while(i-k>=0 and i+k<n and k+vs[i-k]<j) vs[i+k]=vs[i-k],k++;
    i+=k;j-=k;
  }
  return vs;
}
//END CUT HERE
#ifndef call_from_test
//INSERT ABOVE HERE
signed main(){
  return 0;
}
#endif

#line 1 "string/manacher.cpp"

#include <bits/stdc++.h>
using namespace std;
#endif
// https://snuke.hatenablog.com/entry/2014/12/02/235837
//BEGIN CUT HERE
vector<int> manacher(string s){
  int n=s.size();
  vector<int> vs(n);
  for(int i=0,j=0;i<n;){
    while(i-j>=0 and i+j<n and s[i-j]==s[i+j]) j++;
    vs[i]=j;
    int k=1;
    while(i-k>=0 and i+k<n and k+vs[i-k]<j) vs[i+k]=vs[i-k],k++;
    i+=k;j-=k;
  }
  return vs;
}
//END CUT HERE
#ifndef call_from_test
//INSERT ABOVE HERE
signed main(){
  return 0;
}
#endif

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