oj.uz

Submission #879736

# Submission time Handle Problem Language Result Execution time Memory
879736 2023-11-28T03:23:53 Z Phuong0703 Palindromic Partitions (CEOI17_palindromic) C++14
100 / 100
 167 ms 28896 KB 
/*
    Cred : SunnyYeahBoi
    It's my last chance (⌐■_■)
    Problem :
*/

#include<bits/stdc++.h>

using namespace std;

#define int long long
#define double long double
#define all(v) v.begin(), v.end()
#define endl "\n"
#define NAME "a"

const int MAXN = 1e6 + 5;
const int inf = 1e18;
const int MOD = 1e9 + 7;

void FileInput(){
    if(fopen(NAME".inp" , "r") == NULL)
        freopen(NAME".inp" , "w" , stdout);
    freopen(NAME".inp" , "r" , stdin);
    freopen(NAME".out" , "w" , stdout);
}

const int BASE = 311;

string s;
int pref[MAXN] , powBase[MAXN];

int get(int l , int r){
    return ((pref[r] - (pref[l - 1] * powBase[r - l + 1]) % MOD) % MOD + MOD) % MOD;
}

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

    powBase[0] = 1;
    for(int i = 1 ; i < MAXN ; i++)
        powBase[i] = powBase[i - 1] * BASE % MOD;
    for(int i = 1 ; i < s.size() ; i++)
        pref[i] = (pref[i - 1] * BASE + (s[i] - 'a' + 1)) % MOD;
    
    int curL = 1 , curR = n , res = 0;
    while(curL <= curR){
        int len = 1;
        while(curL + len - 1 <= curR && get(curL , curL + len - 1) != get(curR - len + 1 , curR)){
            // cout << curL << " " << curR << " " << len << " " << get(curL , curL + len - 1) << " " << get(curR - len + 1 , curR) << endl;
            len++;
        }
        if(curL + len - 1 < curR - len + 1)
            res += 2;
        else res++;
        curL += len;
        curR -= len;
        // cout << curL << " " << curR << endl;
    }

    cout << res << endl;
}

int32_t main(){
    // FileInput();
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int t = 1;
    cin >> t;
    while(t--)
        solve();
    return 0;
}

Compilation message

palindromic.cpp: In function 'void solve()':
palindromic.cpp:45:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     for(int i = 1 ; i < s.size() ; i++)
      |                     ~~^~~~~~~~~~
palindromic.cpp: In function 'void FileInput()':
palindromic.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen(NAME".inp" , "w" , stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:24:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |     freopen(NAME".inp" , "r" , stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:25:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |     freopen(NAME".out" , "w" , stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 8792 KB Output is correct
2 Correct 44 ms 8816 KB Output is correct
3 Correct 23 ms 8792 KB Output is correct
4 Correct 44 ms 8796 KB Output is correct
5 Correct 44 ms 8796 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 8792 KB Output is correct
2 Correct 44 ms 8816 KB Output is correct
3 Correct 23 ms 8792 KB Output is correct
4 Correct 44 ms 8796 KB Output is correct
5 Correct 44 ms 8796 KB Output is correct
6 Correct 44 ms 8840 KB Output is correct
7 Correct 27 ms 8796 KB Output is correct
8 Correct 44 ms 8796 KB Output is correct
9 Correct 44 ms 8820 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 8792 KB Output is correct
2 Correct 44 ms 8816 KB Output is correct
3 Correct 23 ms 8792 KB Output is correct
4 Correct 44 ms 8796 KB Output is correct
5 Correct 44 ms 8796 KB Output is correct
6 Correct 44 ms 8840 KB Output is correct
7 Correct 27 ms 8796 KB Output is correct
8 Correct 44 ms 8796 KB Output is correct
9 Correct 44 ms 8820 KB Output is correct
10 Correct 45 ms 8796 KB Output is correct
11 Correct 27 ms 8796 KB Output is correct
12 Correct 46 ms 8968 KB Output is correct
13 Correct 46 ms 8796 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 8792 KB Output is correct
2 Correct 44 ms 8816 KB Output is correct
3 Correct 23 ms 8792 KB Output is correct
4 Correct 44 ms 8796 KB Output is correct
5 Correct 44 ms 8796 KB Output is correct
6 Correct 44 ms 8840 KB Output is correct
7 Correct 27 ms 8796 KB Output is correct
8 Correct 44 ms 8796 KB Output is correct
9 Correct 44 ms 8820 KB Output is correct
10 Correct 45 ms 8796 KB Output is correct
11 Correct 27 ms 8796 KB Output is correct
12 Correct 46 ms 8968 KB Output is correct
13 Correct 46 ms 8796 KB Output is correct
14 Correct 167 ms 27648 KB Output is correct
15 Correct 95 ms 22808 KB Output is correct
16 Correct 158 ms 28896 KB Output is correct
17 Correct 107 ms 18900 KB Output is correct