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Submission #45681

# Submission time Handle Problem Language Result Execution time Memory
45681 2018-04-16T02:52:42 Z sorry_Benq Palindromic Partitions (CEOI17_palindromic) C++17
60 / 100
 10000 ms 15364 KB 
#include <bits/stdc++.h>
#define ll          long long
#define pb          push_back
#define mp          make_pair
#define pii         pair<int,int>
#define vi          vector<int>
#define all(a)      (a).begin(),(a).end()
#define F           first
#define S           second
#define sz(x)       (int)x.size()
#define hell        1000000007
#define endl        '\n'
using namespace std;
const int MAXN=1000005;
string s;
struct PalindromicTree{
    int N,cur;
    vector<map<int,int>> next;
    vector<int> link,start,len,diff,slink;
    PalindromicTree(): N(0),cur(0){
        node();
        len[0]=-1;
        node();
    }
    int node(){
        next.emplace_back();
        link.emplace_back(0);
        start.emplace_back(0);
        len.emplace_back(0);
        diff.emplace_back(0);
        slink.emplace_back(0);
        return N++;
    }
    void add_letter(int idx){
		//cout << s[idx] << endl;
        while(true){
            if(idx-len[cur]-1>=0 && s[idx-len[cur]-1]==s[idx])
                break;
            cur=link[cur];
        }
        if(next[cur].find(s[idx])!=next[cur].end()){
            cur=next[cur][s[idx]];
            return;
        }
        node();
        next[cur][s[idx]]=N-1;
        len[N-1]=len[cur]+2;
        start[N-1]=idx-len[N-1]+1;
        if(len[N-1]==1){
            link[N-1]=diff[N-1]=slink[N-1]=1;
            cur=N-1;
            return;
        }
        while(true){
            cur=link[cur];
            if(idx-len[cur]-1>=0 && s[idx-len[cur]-1]==s[idx])
                break;
        }
        link[N-1]=next[cur][s[idx]];
        diff[N-1]=len[N-1]-len[link[N-1]];
        if(diff[N-1]==diff[link[N-1]])
        	slink[N-1]=slink[link[N-1]];
        else
        	slink[N-1]=link[N-1];
        cur=N-1;
    }
};
ll dp[MAXN],sans[MAXN];
int main()
{
	int T; cin >> T;
	for (int testcase = 0; testcase < T; testcase++){
		string str;
		cin>>str;
		//cout << str << endl;
		PalindromicTree pt;
		int i,cur;
		s.clear();
		for(i=0;i<sz(str)/2;i++){
			s.pb(str[i]);
			s.pb(str[sz(str)-i-1]);
		}
		if (sz(str) % 2){
			s.pb(str[sz(str)/2]);
		}
		//cout << s.size() << endl;
		dp[0]=0;
		int res = 1;
		for(i=1;i<=sz(s);i++){
			dp[i] = -hell;
			pt.add_letter(i-1);
			//cout << i << ' ' << dp[i] << ' ' << pt.cur << endl;
			for(cur=pt.cur;cur>1;cur=pt.link[cur]){
				if (pt.len[cur] % 2 == 0){
					dp[i] = max(dp[i], dp[i - pt.len[cur]] + 2);
				}
			}
			int cur = dp[i];
			if (i != sz(s)) cur++;
			if (cur > res) res = cur;
		}
		cout << res << endl;
	}
}

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 428 KB Output is correct
4 Correct 2 ms 540 KB Output is correct
5 Correct 2 ms 652 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 428 KB Output is correct
4 Correct 2 ms 540 KB Output is correct
5 Correct 2 ms 652 KB Output is correct
6 Correct 3 ms 656 KB Output is correct
7 Correct 2 ms 720 KB Output is correct
8 Correct 2 ms 736 KB Output is correct
9 Correct 2 ms 796 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 428 KB Output is correct
4 Correct 2 ms 540 KB Output is correct
5 Correct 2 ms 652 KB Output is correct
6 Correct 3 ms 656 KB Output is correct
7 Correct 2 ms 720 KB Output is correct
8 Correct 2 ms 736 KB Output is correct
9 Correct 2 ms 796 KB Output is correct
10 Correct 715 ms 2504 KB Output is correct
11 Correct 59 ms 2528 KB Output is correct
12 Correct 36 ms 2528 KB Output is correct
13 Correct 17 ms 2528 KB Output is correct

Subtask #4
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 428 KB Output is correct
4 Correct 2 ms 540 KB Output is correct
5 Correct 2 ms 652 KB Output is correct
6 Correct 3 ms 656 KB Output is correct
7 Correct 2 ms 720 KB Output is correct
8 Correct 2 ms 736 KB Output is correct
9 Correct 2 ms 796 KB Output is correct
10 Correct 715 ms 2504 KB Output is correct
11 Correct 59 ms 2528 KB Output is correct
12 Correct 36 ms 2528 KB Output is correct
13 Correct 17 ms 2528 KB Output is correct
14 Execution timed out 10055 ms 15364 KB Time limit exceeded
15 Halted 0 ms 0 KB -