Submission #49511

#	Time	Username	Problem	Language	Result	Execution time	Memory
49511		hamzqq9	Palindromes (APIO14_palindrome)	C++14	0 / 100	47 ms	36964 KiB

palindrome

#include<bits/stdc++.h>
#define lf double
#define ll long long
#define cc pair<char,char>
#define ull unsigned ll
#define ii pair<int,int>
#define li pair<ll,int>
#define iii pair<int,ii>
#define iiii pair<ii,ii>
#define iiii2 pair<int,iii>
#define lii pair<ll,ii>
#define lolo pair<ll,ll>
#define heap priority_queue
#define mp make_pair
#define st first
#define nd second
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define all(x) x.begin(),x.end()
#define len(x) strlen(x)
#define sz(x) (int) x.size()
#define orta ((bas+son)/2)
#define min3(x,y,z) min(min(x,y),z)
#define max3(x,y,z) max(max(x,y),z)
#define umin(x,y) x=min(x,y)
#define umax(x,y) x=max(x,y)
#define dbgs(x) cerr<<(#x)<<" --> "<<(x)<<" "
#define dbg(x) cerr<<(#x)<<" --> "<<(x)<<endl;getchar()
#define MOD 1000000000
#define inf 1000000005
#define N 300005
#define LOG 20
#define magic 100
#define KOK 250
#define EPS 0.0025
#define pw(x) (1<<(x))
#define PI 3.1415926535
using namespace std;

int tot=2,n,now;
int nxt[N][26],link[N],lazy[N],len[N];
char s[N];
ll ans;
stack<int> stc;

void add(int ind) {

	while(s[ind-len[now]-1]!=s[ind]) now=link[now];

	if(nxt[now][s[ind]-'a']) {

		now=nxt[now][s[ind]-'a'];
		lazy[now]++;

		return ;

	} 

	int nw=++tot;	

	nxt[now][s[ind]-'a']=nw;

	len[nw]=len[now]+2;

	stc.push(nw);

	lazy[nw]++;

	if(len[nw]==1) {

		link[nw]=2;

		now=nw;

		return ;

	}

	now=link[now];

	while(s[ind-len[now]-1]!=s[ind]) now=link[now];

	link[nw]=nxt[now][s[ind]-'a'];

	now=nw;

}

int main() {
 
 	#if 0
	freopen("input.txt","r",stdin);
 	#endif

	scanf("%s",s+1);

	n=strlen(s+1);

	link[1]=1;link[2]=1;
	len[1]=-1;len[2]=0;
	now=1;

	for(int i=1;i<=n;i++) add(i);

	while(!stc.empty()) {

		int x=stc.top();

		stc.pop();

		ans=max(ans,1ll*len[x]*lazy[x]);

		lazy[link[x]]++;

	}

	printf("%lld",ans);

}

Compilation message (stderr)

palindrome.cpp: In function 'int main()':
palindrome.cpp:97:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",s+1);
  ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 26
• Subtask 5: 0 / 27