Submission #1338234

#	Time	Username	Problem	Language	Result	Execution time	Memory
1338234		cowwycow	Brperm (RMI20_brperm)	C++20	0 / 100	343 ms	213244 KiB

brperm

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include "brperm.h"
using namespace std;
#define name "aaaaaa"
#define endl "\n"
#define fi first
#define se second
using ll = long long;
using db = double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pdb = pair<db, db>;
using ppii = pair<ll, pii>;
using ull = unsigned long long;
using vvi = vector<vector<int>>;

void file(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    if(fopen(name".inp", "r")) {
        freopen(name".inp", "r", stdin);
        freopen(name".out", "w", stdout);
    }
}

const int N = 5e5 + 5;
const int L = 20;

const int B = 31;
const ll mod = 1e9 + 7;

int n;
char c[N];

ll sus[L];
ll hsh[L][N], b[L][N];
ll hsh2[L][N];

void init(int N, const char S[]){
    n = N;
    for(int i = 0; i < n; i++){
        c[i] = S[i];
    }

    sus[0] = 1;
    sus[1] = B;
    for(int i = 2; i < L; i++){
        sus[i] = sus[i - 1] * sus[i - 1] % mod;
    }

    for(int i = 0; i < n; i++){
        hsh2[0][i] = c[i] - 'a' + 1;
    }
    for(int i = 1; (1 << i) <= n; i++){
        for(int j = 0; j + (1 << i) <= n; j++){
            hsh2[i][j] = (hsh2[i - 1][j] * sus[1 << (i - 1)] + hsh2[i - 1][j + (1 << (i - 1))]) % mod;
        }
    }

    for(int i = 0; (1 << i) <= n; i++){
        for(int j = 0; j < n; j++){
            b[0][j] = c[j] - 'a' + 1;
        }
        for(int j = 1; j <= i; j++){
            for(int k = 0; k + (1 << j) <= n; k++){
                b[j][k] = (b[j - 1][k] * sus[1 << (j - 1)] + b[j - 1][k + (1 << (i - j))]) % mod;
            }
        }
        for(int j = 0; j + (1 << i) <= n; j++){
            hsh[i][j] = b[i][j];
        }
    }
}

int query(int i, int k){
    return hsh[k][i] == hsh2[k][i];
}

Compilation message (stderr)

brperm.cpp: In function 'void file()':
brperm.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
brperm.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 37
• Subtask 3: 0 / 17
• Subtask 4: 0 / 33