oj.uz

Submission #147196

# Submission time Handle Problem Language Result Execution time Memory
147196 2019-08-28T11:30:19 Z MvC Palindromic Partitions (CEOI17_palindromic) C++11
100 / 100
 4747 ms 26488 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)
{
	if(x==1)return 1;
	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<1;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]*bn(pw[j][l[i]],m[j]-2,m[j]))%m[j];
		}
	}
	for(int i=0;i<1;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<1;j++)
				{
					pw[j][i]=1;
					hs[j][i]=s[i];
					//in[j][i]=1;
				}
			}
			else
			{
				for(j=0;j<1;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=0;
		j=0;
		for(i=0;i<n/2;i++)
		{
			if(eq(j,i,n-i-1,n-j-1))
			{
				rs++;
				j=i+1;
			}
		}
		rs*=2;
		if(n%2==1 || j<n/2)rs++;
		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 2 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 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 2 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 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 2 ms 380 KB Output is correct
8 Correct 4 ms 376 KB Output is correct
9 Correct 3 ms 376 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 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 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 2 ms 380 KB Output is correct
8 Correct 4 ms 376 KB Output is correct
9 Correct 3 ms 376 KB Output is correct
10 Correct 45 ms 476 KB Output is correct
11 Correct 24 ms 504 KB Output is correct
12 Correct 50 ms 504 KB Output is correct
13 Correct 44 ms 504 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 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 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 2 ms 380 KB Output is correct
8 Correct 4 ms 376 KB Output is correct
9 Correct 3 ms 376 KB Output is correct
10 Correct 45 ms 476 KB Output is correct
11 Correct 24 ms 504 KB Output is correct
12 Correct 50 ms 504 KB Output is correct
13 Correct 44 ms 504 KB Output is correct
14 Correct 4356 ms 17172 KB Output is correct
15 Correct 1897 ms 22404 KB Output is correct
16 Correct 4747 ms 26488 KB Output is correct
17 Correct 2704 ms 14496 KB Output is correct