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Submission #147173

# Submission time Handle Problem Language Result Execution time Memory
147173 2019-08-28T09:44:49 Z MvC Palindromic Partitions (CEOI17_palindromic) C++11
60 / 100
 10000 ms 49848 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=1e6+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 376 KB Output is correct
4 Correct 3 ms 376 KB Output is correct
5 Correct 3 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 376 KB Output is correct
4 Correct 3 ms 376 KB Output is correct
5 Correct 3 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 7 ms 376 KB Output is correct
9 Correct 15 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 376 KB Output is correct
4 Correct 3 ms 376 KB Output is correct
5 Correct 3 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 7 ms 376 KB Output is correct
9 Correct 15 ms 376 KB Output is correct
10 Correct 5723 ms 1124 KB Output is correct
11 Correct 1090 ms 1144 KB Output is correct
12 Correct 399 ms 1016 KB Output is correct
13 Correct 4860 ms 988 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 376 KB Output is correct
4 Correct 3 ms 376 KB Output is correct
5 Correct 3 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 7 ms 376 KB Output is correct
9 Correct 15 ms 376 KB Output is correct
10 Correct 5723 ms 1124 KB Output is correct
11 Correct 1090 ms 1144 KB Output is correct
12 Correct 399 ms 1016 KB Output is correct
13 Correct 4860 ms 988 KB Output is correct
14 Execution timed out 10108 ms 49848 KB Time limit exceeded
15 Halted 0 ms 0 KB -