oj.uz

Submission #250648

# Submission time Handle Problem Language Result Execution time Memory
250648 2020-07-18T15:07:10 Z Sorting Palindromic Partitions (CEOI17_palindromic) C++14
60 / 100
 10000 ms 21644 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int k_N = 1e6 + 3;
const int cnt_Mod = 1;
const array<ll, cnt_Mod> k_Mod{(int)1e9 + 7}, k_Base{293};

int dp[k_N];
string s;
int n;

array<ll, cnt_Mod> h[k_N], b_pow[k_N];
vector<int> pos[256];
int idx[256];

ll get_hash(int l, int r, int idx){
    if(l == 0) return h[r][idx];
    ll ans = (h[r][idx] - h[l - 1][idx] * b_pow[r - l + 1][idx]) % k_Mod[idx];
    return (ans < 0) ? (ans + k_Mod[idx]) : ans;
}

bool equal(int l1, int r1, int l2, int r2){
    for(int i = 0; i < cnt_Mod; ++i)
        if(get_hash(l1, r1, i) != get_hash(l2, r2, i))
            return false;
    return true;
}

void init_hashing(){
    for(int i = 0; i < n; ++i){
        for(int j = 0; j < cnt_Mod; ++j){
            if(i == 0)
                h[i][j] = s[i];
            else
                h[i][j] = (h[i - 1][j] * k_Base[j] + s[i]) % k_Mod[j];
        }
    }

    for(int i = 0; i < n; ++i){
        for(int j = 0; j < cnt_Mod; ++j){
            if(i == 0)
                b_pow[i][j] = 1;
            else
                b_pow[i][j] = b_pow[i - 1][j] * k_Base[j] % k_Mod[j];
        }
    }
}

void solve(){
    cin >> s;
    n = (int)s.size();

    if(n == 1){
        cout << "1\n";
        return;
    }


    init_hashing();
    for(int i = 0; i < n; ++i)
        pos[s[i]].push_back(i);

    int mid = (n - 1) / 2, mid2 = (n - 2) / 2;
    int ans = 0, i = 0;
    while(true){
        if(i > mid)
            break;

        bool changed = false;
        for(int k = (int)pos[s[i]].size() - 1; k >= 0; --k){
            int j = pos[s[i]][k];
            if(j > n - i - 1) continue;
            if(n - j - 1 >= j) break;

            if(equal(i, n - j - 1, j, n - i - 1)){
                ans += 2;
                i = n - j;
                changed = true;
                break;
            }
        }
        if(!changed){
            ans++;
            break;
        }
    }

    cout << ans << "\n";
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    int t;
    cin >> t;

    while(t--)
        solve();
}

Compilation message

palindromic.cpp: In function 'void solve()':
palindromic.cpp:64:17: warning: array subscript has type 'char' [-Wchar-subscripts]
         pos[s[i]].push_back(i);
                 ^
palindromic.cpp:73:34: warning: array subscript has type 'char' [-Wchar-subscripts]
         for(int k = (int)pos[s[i]].size() - 1; k >= 0; --k){
                                  ^
palindromic.cpp:74:29: warning: array subscript has type 'char' [-Wchar-subscripts]
             int j = pos[s[i]][k];
                             ^
palindromic.cpp:66:28: warning: unused variable 'mid2' [-Wunused-variable]
     int mid = (n - 1) / 2, mid2 = (n - 2) / 2;
                            ^~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 34 ms 1160 KB Output is correct
11 Correct 11 ms 896 KB Output is correct
12 Correct 5 ms 1148 KB Output is correct
13 Correct 23 ms 1024 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 34 ms 1160 KB Output is correct
11 Correct 11 ms 896 KB Output is correct
12 Correct 5 ms 1148 KB Output is correct
13 Correct 23 ms 1024 KB Output is correct
14 Execution timed out 10080 ms 21644 KB Time limit exceeded
15 Halted 0 ms 0 KB -