Submission #47664

#	Time	Username	Problem	Language	Result	Execution time	Memory
47664		WA_TLE	Palindromes (APIO14_palindrome)	C++14	23 / 100	1086 ms	1700 KiB

palindrome

#include<deque>
#include<queue>
#include<vector>
#include<algorithm>
#include<iostream>
#include<set>
#include<cmath>
#include<tuple>
#include<string>
#include<chrono>
#include<functional>
#include<iterator>
#include<random>
#include<unordered_set>
#include<array>
#include<map>
#include<iomanip>
#include<assert.h>
using namespace std;
typedef long long int llint;
typedef long double lldo;
#define mp make_pair
#define mt make_tuple
#define pub push_back
#define puf push_front
#define pob pop_back
#define pof pop_front
#define fir first
#define sec second
#define res resize
#define ins insert
#define era erase
//cout<<setprecision(20)
//cin.tie(0);
//ios::sync_with_stdio(false);
const llint mod=1000000007;
const llint big=2.19e18+1;
const long double pai=3.141592653589793238462643383279502884197;
const long double eps=1e-15;
template <class T,class U>void mineq(T& a,U b){if(a>b){a=b;}}
template <class T,class U>void maxeq(T& a,U b){if(a<b){a=b;}}
llint gcd(llint a,llint b){if(a%b==0){return b;}else return gcd(b,a%b);}
llint lcm(llint a,llint b){return a/gcd(a,b)*b;}
template<class T> void SO(T& ve){sort(ve.begin(),ve.end());}
template<class T> void REV(T& ve){reverse(ve.begin(),ve.end());}
int LBI(vector<int>&ar,llint in){return lower_bound(ar.begin(),ar.end(),in)-ar.begin();}
int UBI(vector<int>&ar,llint in){return upper_bound(ar.begin(),ar.end(),in)-ar.begin();}
int main(void){
	string str;cin>>str;
	//O(n^2) ハッシュ
	map<pair<llint,int>,int>ha;
	int i,j,s,t,n=str.size();
	if(n>10000){return 0;}
	for(i=0;i<n;i++){
		s=i,t=i;
		int naga=-1;
		llint roll=0;
		while(s>=0&&t<n&&str[s]==str[t]){
			naga+=2;
			
			roll*=1001;roll+=str[s];roll%=mod;ha[mp(roll,naga)]++;
			s--;t++;
		}
		naga=0;s=i;t=i+1;roll=0;
		while(s>=0&&t<n&&str[s]==str[t]){
			naga+=2;
			
			roll*=1001;roll+=str[s];roll%=mod;ha[mp(roll,naga)]++;
			s--;t++;
		}
	}
	llint ans=0;
	for(auto it:ha){maxeq(ans,it.fir.sec*it.sec);}
	cout<<ans<<endl;
	return 0;
}

Compilation message (stderr)

palindrome.cpp: In function 'int main()':
palindrome.cpp:52:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,s,t,n=str.size();
        ^

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