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Submission #67436

# Submission time Handle Problem Language Result Execution time Memory
67436 2018-08-14T09:25:22 Z KLPP Palindromes (APIO14_palindrome) C++14
23 / 100
 1000 ms 8896 KB 
#include<iostream>
#include<map>
using namespace std;
typedef long long int lld;
#define MOD 1000000007
#define BASE 257
lld hash2[1000000];
lld hash3[1000000];
lld pow[1000000];
int n;
bool palindrome(int a, int b){
	lld A=hash3[b+1]-hash3[a];
	A*=pow[n-1-a];
	lld B=hash2[a]-hash2[b+1];
	B*=pow[b];
	A%=MOD;
	B%=MOD;
	if(B<0)B+=MOD;
	if(A<0)A+=MOD;
	//cout<<a<<" "<<b<<" "<<A<<" "<<B<<endl;
	if(A%MOD==B%MOD)return true;
	return false; 
}
lld val(int a, int b){
	lld A=hash3[b+1]-hash3[a];
	A*=pow[n-1-a];
	A%=MOD;
	if(A<0)A+=MOD;
	return A; 
}
int main(){
	string s;
	cin>>s;
	n=s.size();
	hash3[0]=0;
	lld v=1;
	for(int i=1;i<=n;i++){
		hash3[i]=(s.at(i-1))*v+hash3[i-1];
		hash3[i]%=MOD;
		pow[i-1]=v;
		v*=BASE;
		v%=MOD;
	}
	hash2[n]=0;
	v=1;
	for(int i=n-1;i>-1;i--){
		hash2[i]=(s.at(i))*v+hash2[i+1];
		hash2[i]%=MOD;
		v*=BASE;
		v%=MOD;
	}
	//cout<<hash2[0]<<" "<<hash[n]<<endl;
	lld ans=0;
	for(lld len=1;len<=n;len++){
		map<lld,int> m;
		//cout<<hash[i]<<" "<<hash2[i]<<endl;
		for(int i=0;i+len-1<n;i++){
			if(palindrome(i,i+len-1)){
				lld H=val(i,i+len-1);
				map<lld,int>::iterator it=m.find(H);
				if(it==m.end()){
					m[H]=1;
					ans=max(ans,len);
					//cout<<len<<endl;
				}else{
					it->second++;
					ans=max(ans,it->second*len);
					//cout<<it->second*len<<endl;
				}
			}
		}
		//cout<<(hash[i]+hash2[i])%MOD<<endl;
	}cout<<ans<<endl;
	//cout<<palindrome(0,2)<<endl;
	
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 248 KB Output is correct
2 Correct 3 ms 488 KB Output is correct
3 Correct 3 ms 524 KB Output is correct
4 Correct 3 ms 572 KB Output is correct
5 Correct 2 ms 688 KB Output is correct
6 Correct 3 ms 688 KB Output is correct
7 Correct 2 ms 692 KB Output is correct
8 Correct 2 ms 696 KB Output is correct
9 Correct 2 ms 704 KB Output is correct
10 Correct 2 ms 748 KB Output is correct
11 Correct 3 ms 760 KB Output is correct
12 Correct 3 ms 760 KB Output is correct
13 Correct 2 ms 764 KB Output is correct
14 Correct 2 ms 768 KB Output is correct
15 Correct 2 ms 772 KB Output is correct
16 Correct 2 ms 776 KB Output is correct
17 Correct 3 ms 800 KB Output is correct
18 Correct 3 ms 804 KB Output is correct
19 Correct 2 ms 808 KB Output is correct
20 Correct 2 ms 808 KB Output is correct
21 Correct 3 ms 808 KB Output is correct
22 Correct 2 ms 820 KB Output is correct
23 Correct 3 ms 824 KB Output is correct
24 Correct 3 ms 828 KB Output is correct
25 Correct 3 ms 832 KB Output is correct
26 Correct 3 ms 836 KB Output is correct
27 Correct 3 ms 840 KB Output is correct
28 Correct 2 ms 844 KB Output is correct
29 Correct 4 ms 848 KB Output is correct
30 Correct 2 ms 852 KB Output is correct
31 Correct 2 ms 852 KB Output is correct
32 Correct 2 ms 852 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 864 KB Output is correct
2 Correct 11 ms 864 KB Output is correct
3 Correct 17 ms 872 KB Output is correct
4 Correct 9 ms 872 KB Output is correct
5 Correct 11 ms 880 KB Output is correct
6 Correct 12 ms 1012 KB Output is correct
7 Correct 7 ms 1012 KB Output is correct
8 Correct 12 ms 1012 KB Output is correct
9 Correct 7 ms 1012 KB Output is correct
10 Correct 8 ms 1012 KB Output is correct
11 Correct 11 ms 1012 KB Output is correct
12 Correct 10 ms 1012 KB Output is correct

Subtask #3
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 706 ms 1192 KB Output is correct
2 Correct 568 ms 1216 KB Output is correct
3 Correct 844 ms 1336 KB Output is correct
4 Correct 755 ms 1336 KB Output is correct
5 Correct 481 ms 1336 KB Output is correct
6 Correct 489 ms 1336 KB Output is correct
7 Correct 526 ms 1336 KB Output is correct
8 Correct 482 ms 1408 KB Output is correct
9 Incorrect 488 ms 1436 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #4
0 / 26.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1087 ms 3648 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1069 ms 8896 KB Time limit exceeded
2 Halted 0 ms 0 KB -