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Submission #44680

# Submission time Handle Problem Language Result Execution time Memory
44680 2018-04-04T19:38:44 Z bogdan10bos Palindromic Partitions (CEOI17_palindromic) C++14
60 / 100
 10000 ms 19848 KB 
#include <bits/stdc++.h>

using namespace std;

//#define FILE_IO

typedef pair<char, char> pcc;
typedef long long LL;

const int base = 31;

int N;
int dp[1000005];
char s[1000005];
LL pw[1000005], hsh[1000005];
map< pcc, vector<int> > mp;

int get_hash(int st, int dr)
{
    return hsh[dr] - hsh[st - 1] * pw[dr - st + 1];
}

void solve_test()
{
    scanf("%s", s + 1);
    N = strlen(s + 1);
    for(int i = 1; i <= N; i++)
        hsh[i] = (1LL * hsh[i - 1] * base) + s[i] - 'a' + 1;
    mp.clear();
    int ans = 1;
    for(int st = 1, dr = N; st < dr; st++, dr--)
    {
        dp[st] = 0;
        for(auto pos: mp[{s[dr], s[st]}])
        {
            int lgt = st - pos + 1;
            if(dp[pos - 1] > 0 && get_hash(pos, st) == get_hash(dr, dr + lgt - 1))
                dp[st] = max(dp[st], dp[pos - 1] + 2);
        }
        if(get_hash(1, st) == get_hash(dr, N))
            dp[st] = max(dp[st], 2);
        if(s[st] == s[dr] && dp[st - 1])
            dp[st] = max(dp[st], dp[st - 1] + 2);
        ans = max(ans, dp[st] + (st + 1 < dr ? 1 : 0));
        mp[{s[st], s[dr]}].push_back(st);
    }

    printf("%d\n", ans);
}

int main()
{
    #ifdef FILE_IO
    freopen("1.in", "r", stdin);
    freopen("1.out", "w", stdout);
    #endif

    pw[0] = 1;
    int N = 1e6;
    for(int i = 1; i <= N; i++)
        pw[i] = 1LL * pw[i - 1] * base;

    int T;
    scanf("%d\n", &T);
    for(int t = 1; t <= T; t++)
        solve_test();

    return 0;
}

Compilation message

palindromic.cpp: In function 'void solve_test()':
palindromic.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", s + 1);
     ~~~~~^~~~~~~~~~~~~
palindromic.cpp: In function 'int main()':
palindromic.cpp:64:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d\n", &T);
     ~~~~~^~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 8184 KB Output is correct
2 Correct 7 ms 8292 KB Output is correct
3 Correct 9 ms 8292 KB Output is correct
4 Correct 7 ms 8316 KB Output is correct
5 Correct 7 ms 8320 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 8184 KB Output is correct
2 Correct 7 ms 8292 KB Output is correct
3 Correct 9 ms 8292 KB Output is correct
4 Correct 7 ms 8316 KB Output is correct
5 Correct 7 ms 8320 KB Output is correct
6 Correct 8 ms 8324 KB Output is correct
7 Correct 8 ms 8456 KB Output is correct
8 Correct 8 ms 8456 KB Output is correct
9 Correct 8 ms 8572 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 8184 KB Output is correct
2 Correct 7 ms 8292 KB Output is correct
3 Correct 9 ms 8292 KB Output is correct
4 Correct 7 ms 8316 KB Output is correct
5 Correct 7 ms 8320 KB Output is correct
6 Correct 8 ms 8324 KB Output is correct
7 Correct 8 ms 8456 KB Output is correct
8 Correct 8 ms 8456 KB Output is correct
9 Correct 8 ms 8572 KB Output is correct
10 Correct 188 ms 8804 KB Output is correct
11 Correct 43 ms 8872 KB Output is correct
12 Correct 84 ms 8944 KB Output is correct
13 Correct 149 ms 9048 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 8184 KB Output is correct
2 Correct 7 ms 8292 KB Output is correct
3 Correct 9 ms 8292 KB Output is correct
4 Correct 7 ms 8316 KB Output is correct
5 Correct 7 ms 8320 KB Output is correct
6 Correct 8 ms 8324 KB Output is correct
7 Correct 8 ms 8456 KB Output is correct
8 Correct 8 ms 8456 KB Output is correct
9 Correct 8 ms 8572 KB Output is correct
10 Correct 188 ms 8804 KB Output is correct
11 Correct 43 ms 8872 KB Output is correct
12 Correct 84 ms 8944 KB Output is correct
13 Correct 149 ms 9048 KB Output is correct
14 Execution timed out 10032 ms 19848 KB Time limit exceeded
15 Halted 0 ms 0 KB -