oj.uz

Submission #563236

# Submission time Handle Problem Language Result Execution time Memory
563236 2022-05-16T14:38:27 Z kawaii Palindromic Partitions (CEOI17_palindromic) C++14
0 / 100
 1 ms 212 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
#define hash hsh

int t, n, m, k, hash[1000005], base = 353, mod = 696969601;
string s;
mt19937_64 rng;

int mul(int x, int y){
    if(y == 0) return 1;
    int ans = mul(x, y / 2);
    if(y % 2 == 0) return (ans * ans) % mod;
    else return (((ans * ans) % mod) * x) % mod;
}

void solve(){
    n = s.size();
    s = '0' + s;
    for(int i = 1; i <= n; i++) hash[i] = (hash[i - 1] * base + s[i]) % mod; 
    int cnt = 1, ans = 0;
    while(cnt <= n - cnt + 1){ 
        int f = cnt - 1;
        bool flag = 0;
        while(1){
            int num1 = (hash[cnt] - (hash[f] * mul(base, cnt - f)) % mod) % mod;
            int num2 = (hash[n - f] - (hash[n - cnt] * mul(base, cnt - f)) % mod) % mod;
            // cout << cnt <<" "<< n - cnt + 1 <<" "<< num1 <<" "<< num2 << endl;
            if(num1 == num2){
                if(cnt == n - cnt + 1) ans++;
                else ans += 2; cnt++; flag = 1; break;
            }
            cnt++;
            if(cnt > n - cnt + 1) break;
        }
        if(!flag){
            ans++; break;
        } 
    }
    cout << ans << "\n";
}

signed main(){
    ios_base::sync_with_stdio(NULL); cin.tie(nullptr); cout.tie(nullptr);
    // rng.seed((int)main ^ time(0));
    #ifdef Kawaii
        auto starttime = chrono::high_resolution_clock::now();
    #endif

    cin >> t;
    while(t--){
        cin >> s;
        solve();
    }

    #ifdef Kawaii
        auto endtime = chrono::high_resolution_clock::now();
        auto duration = chrono::duration_cast<chrono::milliseconds>(endtime - starttime).count(); 
        cout << "\n=====" << "\nUsed: " << duration << " ms\n";
    #endif
}

Compilation message

palindromic.cpp: In function 'void solve()':
palindromic.cpp:33:17: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   33 |                 else ans += 2; cnt++; flag = 1; break;
      |                 ^~~~
palindromic.cpp:33:32: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
   33 |                 else ans += 2; cnt++; flag = 1; break;
      |                                ^~~

Subtask #1
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -