Submission #223276

#	Time	Username	Problem	Language	Result	Execution time	Memory
223276		errorgorn	Lampice (COCI19_lampice)	C++14	25 / 110	23 ms	31616 KiB

lampice

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ll,ii>
#define endl '\n'

int edges[300005][26];
int backedge[300005];
int len[300005];

int PREV=0;
int INDEX=1;

int n;
string s;

int main(){
	ios::sync_with_stdio(0);
    cin.tie(0);
	
	cin>>n>>s;
	
	int ans=0;
	
	memset(edges,-1,sizeof(edges));
	backedge[0]=0,backedge[1]=0;
	len[0]=-1,len[1]=0;

	for (int x=0;x<s.size();x++){
		while (s[x-len[PREV]-1]!=s[x]) 
			PREV=backedge[PREV];
		
		if (edges[PREV][s[x]-'a']==-1) 
			edges[PREV][s[x]-'a']=++INDEX;
		int curr=edges[PREV][s[x]-'a'];
		len[curr]=len[PREV]+2;
		
		ans=max(ans,len[curr]);
		
		if (len[curr]==1){
			backedge[curr]=1;
		}
		else{
			int b=backedge[PREV];
			while (s[x-len[b]-1]!=s[x]) b=backedge[b];
			backedge[curr]=edges[b][s[x]-'a'];
		}
		
		PREV=curr;
	}
	
	cout<<ans<<endl;
}

Compilation message (stderr)

lampice.cpp: In function 'int main()':
lampice.cpp:30:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int x=0;x<s.size();x++){
               ~^~~~~~~~~

• Subtask 1: 0 / 17
• Subtask 2: 25 / 25
• Subtask 3: 0 / 31
• Subtask 4: 0 / 37