Submission #982695

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
982695	2024-05-14 16:12:51	Alebn	Palindromic Partitions (CEOI17_palindromic)	C++14	100 / 100	349 ms	48080 KiB

palindromic

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#include <bits/stdc++.h>
#define int long long
using namespace std;
int n, M = 1e9+7, P = 31, N = 1e6 + 1;
string s;
vector<int> p, inv, haah;
int mod(int i) {
    return (i + M) % M;
}
int fast(int i, int j) {
    //cout << i << " " << j << "\n";
    if(j == 0) return 1;
    int a = fast(i, j / 2);
    return mod(mod(a * a) * (j % 2 == 0 ? 1 : i));
}
signed main() {
    int t;
    cin >> t;
    //
    p = vector<int>(N), inv = vector<int>(N);
    p[0] = 1;
    for(int i = 1; i < N; i++) p[i] = mod(p[i - 1] * P);
    inv[N - 1] = fast(p[N - 1], M - 2);
    for(int i = N - 2; i > -1; i--) inv[i] = mod(inv[i + 1] * P);
    //
    while(t--) {
 
 
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• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 40 / 40