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Submission #147172

# Submission time Handle Problem Language Result Execution time Memory
147172 2019-08-28T09:44:01 Z MvC Palindromic Partitions (CEOI17_palindromic) C++11
60 / 100
 5720 ms 4888 KB 
#pragma GCC target("avx2")
#pragma GCC optimization("O3")
#pragma GCC optimization("unroll-loops")
#include<bits/stdc++.h>
//#include "boxes.h"
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<61);
const int inf=(1<<30);
const int nmax=1e4+50;
const int mod=1e9+7;
using namespace std;
int n,i,j,rs,f[nmax],x,t;
ll p[]={31,67},m[]={1000003,1000000007},pw[2][nmax],in[2][nmax],hs[2][nmax];
string s;
ll bn(ll x,ll p,ll md)
{
	ll rs=1;
	while(p)
	{
		if(p&1LL)rs=(rs*x)%md;
		x=(x*x)%md;
		p>>=1LL;
	}
	return rs;
}
bool eq(int L,int R,int A,int B)
{
	ll x[2][2];
	int l[2],r[2];
	l[0]=L,l[1]=A,r[0]=R,r[1]=B;
	for(int i=0;i<2;i++)
	{
		for(int j=0;j<2;j++)
		{
			x[i][j]=hs[j][r[i]];
			if(l[i])x[i][j]=(x[i][j]-hs[j][l[i]-1]+m[j])%m[j];
			x[i][j]=(x[i][j]*in[j][l[i]])%m[j];
		}
	}
	for(int i=0;i<2;i++)if(x[0][i]!=x[1][i])return 0;
	return 1;
}
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	cin>>t;
	while(t--)
	{
		cin>>s;
		n=s.size();
		for(i=0;i<n;i++)
		{
			if(i==0)
			{
				for(j=0;j<2;j++)
				{
					pw[j][i]=1;
					hs[j][i]=s[i];
					in[j][i]=1;
				}
			}
			else
			{
				for(j=0;j<2;j++)
				{
					pw[j][i]=(pw[j][i-1]*p[j])%m[j];
					hs[j][i]=(hs[j][i-1]+pw[j][i]*s[i])%m[j];
					in[j][i]=bn(pw[j][i],m[j]-2,m[j]);
				}
			}
		}
		rs=1;
		for(i=0;i<n/2;i++)
		{
			f[i]=-1;
			for(j=i;j>=0;j--)
			{
				if(j && f[j-1]==-1)continue;
				x=0;
				if(j)x=f[j-1];
				if(eq(j,i,n-i-1,n-j-1))
				{
					f[i]=max(f[i],x+2);
				}
			}
			if(f[i]!=-1)
			{
				if(i==(n/2)-1 && n%2==0)rs=max(rs,f[i]);
				else rs=max(rs,f[i]+1);
			}
		}
		cout<<rs<<endl;
	}
	return 0;
}

Compilation message

palindromic.cpp:2:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("O3")
 
palindromic.cpp:3:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("unroll-loops")

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 11 ms 376 KB Output is correct
7 Correct 6 ms 376 KB Output is correct
8 Correct 6 ms 376 KB Output is correct
9 Correct 14 ms 376 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 11 ms 376 KB Output is correct
7 Correct 6 ms 376 KB Output is correct
8 Correct 6 ms 376 KB Output is correct
9 Correct 14 ms 376 KB Output is correct
10 Correct 5720 ms 1072 KB Output is correct
11 Correct 1096 ms 888 KB Output is correct
12 Correct 401 ms 1016 KB Output is correct
13 Correct 4849 ms 888 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 11 ms 376 KB Output is correct
7 Correct 6 ms 376 KB Output is correct
8 Correct 6 ms 376 KB Output is correct
9 Correct 14 ms 376 KB Output is correct
10 Correct 5720 ms 1072 KB Output is correct
11 Correct 1096 ms 888 KB Output is correct
12 Correct 401 ms 1016 KB Output is correct
13 Correct 4849 ms 888 KB Output is correct
14 Runtime error 26 ms 4888 KB Execution killed with signal 11 (could be triggered by violating memory limits)
15 Halted 0 ms 0 KB -