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Submission #140621

# Submission time Handle Problem Language Result Execution time Memory
140621 2019-08-03T19:39:47 Z MGH Palinilap (COI16_palinilap) C++14
54 / 100
 95 ms 31480 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 = 727 ;
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<<' ';
		
		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]+1LL*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]+1LL*(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 , 1LL*dpl[y-1]+dpr[y+1]+Ans[k][y]);
	cout<<ans;
	return 0 ;
}

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 3 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 2140 KB Output is correct
2 Correct 5 ms 2196 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 2168 KB Output is correct

Subtask #3
0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 83 ms 31324 KB Output is correct
2 Correct 88 ms 31344 KB Output is correct
3 Correct 82 ms 31340 KB Output is correct
4 Correct 89 ms 31352 KB Output is correct
5 Correct 90 ms 31224 KB Output is correct
6 Correct 77 ms 31352 KB Output is correct
7 Correct 87 ms 31380 KB Output is correct
8 Correct 84 ms 31480 KB Output is correct
9 Correct 88 ms 31352 KB Output is correct
10 Correct 74 ms 31352 KB Output is correct
11 Correct 84 ms 31352 KB Output is correct
12 Correct 84 ms 31256 KB Output is correct
13 Correct 88 ms 31352 KB Output is correct
14 Correct 74 ms 31452 KB Output is correct
15 Correct 75 ms 31352 KB Output is correct
16 Correct 95 ms 31224 KB Output is correct
17 Correct 71 ms 31224 KB Output is correct
18 Incorrect 79 ms 31344 KB Output isn't correct
19 Halted 0 ms 0 KB -