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Submission #140619

# Submission time Handle Problem Language Result Execution time Memory
140619 2019-08-03T19:31:11 Z MGH Palinilap (COI16_palinilap) C++14
54 / 100
 108 ms 31496 KB 
#include <bits/stdc++.h>
#define  pb push_back
#define  S second
#define  F first
#define ll long long
#define ld long double
using namespace std;
typedef pair<int,int> pii ;
typedef pair<ll,pii> piii ;
//setprecision(8)
//freopen("chip.in","r",stdin);freopen("chip.out","w",stdout);
const int maxn = 2e5+10 , maxk = 30 , mbn = 293 ;
string s ;
int n ;
ll dpl[maxn] , dpr[maxn] , Ans[maxk+3][maxn]  , pr[2][maxn] , pl[2][maxn] , hl[maxn] , hr[maxn] , pw[maxn] ;
bool check(int i ,int j,int l,int r)
{
	ll A = hl[j]-hl[i-1]*pw[j-i+1] ;
	ll B = hr[l]-hr[r+1]*pw[r-l+1] ;
	return (A==B) ;
}
int Bs(int l ,int r , int i , int j)
{
	if(i+1==j)
	return i ;
	int mid = (i+j)>>1 ;
	if(check(l-mid,l,r,r+mid))
	return Bs(l,r,mid,j);
	return Bs(l,r,i,mid);
}
int get(int i ,int j)
{
	if((i<=0||j>n)||s[i-1]!=s[j-1])
	return -1 ;
	return Bs(i,j,0,min(i-1,n-j)+1);
}

int main()
{
	ios_base::sync_with_stdio(false);cin.tie();
	cin>>s;
	n = s.size(),pw[0]=1;
	for(int y = 1 ; y <= n ; y++)
	hl[y] = (hl[y-1]*mbn+s[y-1]-'a'+1) ;
	for(int y = n ; y ; y--)
	hr[y] = (hr[y+1]*mbn+s[y-1]-'a'+1) ;
	for(int y = 1 ; y <= n ; y++)
	pw[y] = (mbn*pw[y-1]) ;
	for(int y = 1 ; y <= n ; y++)
	{
	//	cout<<endl;
		int fa = get(y,y) ;
	//	cout<<y<<' '<<fa<<' ' ;
		pl[1][y]++;pl[1][y+fa+1]--;
		pl[0][y]-=(y-1),pl[0][y+fa+1]+=(y-1),pl[0][y+fa+1]+=fa+1;
		pr[1][y]++,pr[1][y-fa-1]--;
		pr[0][y]-=(n+1-y-1),pr[0][y-fa-1]+=(n+1-y-1),pr[0][y-fa-1]+=fa+1;
		for(int x = 0 ; x < maxk ; x++)
		Ans[x][y]+=fa+1 ;
		if(y-fa==1||y+fa==n)
		continue ;
		int fa2 = get(y-fa-2,y+fa+2)+2;
	//	cout<<fa2;
		Ans[s[y+fa]-'a'+1][y-fa-1]+=fa2;
		Ans[s[y-fa-2]-'a'+1][y+fa+1]+=fa2 ;
	}
	for(int y = 1 ; y < n ;  y++)
	{
//		cout<<endl;	
		int fa = get(y,y+1) ;
//		cout<<y<<' '<<fa<<' ';
		if(fa!=-1)
		{
			pl[1][y+1]++,pl[1][y+fa+2]--;
			pl[0][y+1]-=y,pl[0][y+fa+2]+=y,pl[0][y+fa+2]+=fa+1;
			pr[1][y]++,pr[1][y-fa-1]--;
			pr[0][y]-=(n+1-y-1),pr[0][y-fa-1]+=(n+1-y-1),pr[0][y-fa-1]+=fa+1 ;
		}
		if(y-fa==1||y+1+fa==n)
		continue ;
		int fa2 = get(y-fa-2,y+1+fa+2)+2;
		Ans[s[y+1+fa]-'a'+1][y-fa-1]+=fa2;
		Ans[s[y-fa-2]-'a'+1][y+2+fa]+=fa2;
	}
	for(int y = 1 ; y <= n ; y++)
	pl[0][y]+=pl[0][y-1],pl[1][y]+=pl[1][y-1],dpl[y]=pl[0][y]+y*pl[1][y] ;
	for(int y = n ; y ; y--)
	pr[0][y]+=pr[0][y+1],pr[1][y]+=pr[1][y+1],dpr[y]=pr[0][y]+(n+1-y)*pr[1][y];
	ll ans = dpl[n] ;
	for(int y = 1 ; y <= n ; y++)
	for(int k = 0 ; k < maxk ; k++)
	ans = max(ans , dpl[y-1]+dpr[y+1]+Ans[k][y]);
	cout<<ans;
}

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 632 KB Output is correct
2 Correct 2 ms 632 KB Output is correct
3 Correct 2 ms 632 KB Output is correct
4 Correct 2 ms 632 KB Output is correct
5 Correct 2 ms 632 KB Output is correct

Subtask #2
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 2168 KB Output is correct
2 Correct 5 ms 2168 KB Output is correct
3 Correct 5 ms 2168 KB Output is correct
4 Correct 4 ms 1528 KB Output is correct
5 Correct 4 ms 1912 KB Output is correct
6 Correct 5 ms 2168 KB Output is correct
7 Correct 4 ms 2296 KB Output is correct

Subtask #3
0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 31352 KB Output is correct
2 Correct 86 ms 31360 KB Output is correct
3 Correct 82 ms 31352 KB Output is correct
4 Correct 77 ms 31352 KB Output is correct
5 Correct 91 ms 31352 KB Output is correct
6 Correct 79 ms 31352 KB Output is correct
7 Correct 77 ms 31352 KB Output is correct
8 Correct 78 ms 31240 KB Output is correct
9 Correct 76 ms 31352 KB Output is correct
10 Correct 76 ms 31352 KB Output is correct
11 Correct 90 ms 31340 KB Output is correct
12 Correct 86 ms 31260 KB Output is correct
13 Correct 106 ms 31420 KB Output is correct
14 Correct 76 ms 31352 KB Output is correct
15 Correct 89 ms 31352 KB Output is correct
16 Correct 108 ms 31496 KB Output is correct
17 Correct 80 ms 31384 KB Output is correct
18 Incorrect 94 ms 31224 KB Output isn't correct
19 Halted 0 ms 0 KB -