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Submission #494419

# Submission time Handle Problem Language Result Execution time Memory
494419 2021-12-15T12:15:00 Z jasen_penchev Brperm (RMI20_brperm) C++14
100 / 100
 1996 ms 168664 KB 
#include "brperm.h"
#include <iostream>
#define endl '\n'
using namespace std;

const int MAXN = 500000;
const int LOG = 20;
const int BASE = 26;
const int MOD = 1000000007;

int n;
int pw[MAXN + 1];

struct Hash
{
    int len;
    int num;
};

Hash operator + (Hash h1, Hash h2)
{
    Hash ret;
    ret.len = h1.len + h2.len;
    ret.num = (1ll * h1.num * pw[h2.len] + h2.num) % MOD;
    return ret;
}

bool operator == (Hash h1, Hash h2)
{
    return (h1.len == h2.len and h1.num == h2.num);
}

Hash h1[MAXN + 1][LOG + 1];
Hash h2[MAXN + 1][LOG + 1];

void init(int n0, const char s[])
{
    n = n0;

    pw[0] = 1;
    for (int i = 1; i <= MAXN; ++ i)
    {
        pw[i] = (1ll * pw[i - 1] * BASE) % MOD;
    }

    for (int i = 0; i < n; ++ i)
    {
        h1[i][0].len = 1;
        h1[i][0].num = s[i] - 'a';
    }

    for (int j = 1; j <= LOG; ++ j)
    {
        for (int i = 0; i < n - (1ll << (j - 1)); ++ i)
        {
            h1[i][j] = h1[i][j - 1] + h1[i + (1ll << (j - 1))][j - 1];
        }
    }

    for (int j = 0; j <= LOG; ++ j)
    {
        for (int i = 0; i < n; ++ i)
        {
            h2[i][j].len = 1;
            h2[i][j].num = s[i] - 'a';
        }
        for (int k = j - 1; k >= 0; -- k)
        {
            for (int i = 0; i < n - (1ll << k); ++ i)
            {
                h2[i][j] = h2[i][j] + h2[i + (1ll << k)][j];
            }
        }
    }

    return;
}

int query(int pos, int k)
{
    if (pos + (1ll << k) > n) return 0;
    return (h1[pos][k] == h2[pos][k]);
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 2508 KB Output is correct
2 Correct 5 ms 2624 KB Output is correct

Subtask #2
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 2508 KB Output is correct
2 Correct 5 ms 2624 KB Output is correct
3 Correct 277 ms 35828 KB Output is correct
4 Correct 315 ms 35916 KB Output is correct
5 Correct 335 ms 36008 KB Output is correct

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1996 ms 168664 KB Output is correct
2 Correct 1751 ms 168572 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 2508 KB Output is correct
2 Correct 5 ms 2624 KB Output is correct
3 Correct 277 ms 35828 KB Output is correct
4 Correct 315 ms 35916 KB Output is correct
5 Correct 335 ms 36008 KB Output is correct
6 Correct 1996 ms 168664 KB Output is correct
7 Correct 1751 ms 168572 KB Output is correct
8 Correct 1770 ms 168580 KB Output is correct
9 Correct 1971 ms 168552 KB Output is correct
10 Correct 1892 ms 168604 KB Output is correct