Submission #858040

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
858040	2023-10-07T11:05:40 Z	boris_mihov	Brperm (RMI20_brperm)	C++17	Compilation error	0 ms	0 KB

brperm

#include "brperm.h"
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>

typedef long long llong;
const int MAXN = 500000 + 10;
const int MOD = 1e9 + 7;
const int MAXLOG = 20;

int n;
char s[MAXN];
int base[3 * MAXN];

struct Sparse
{
    int normalHash[MAXN][MAXLOG];
    int danceHash[MAXN][MAXLOG][MAXLOG];

    void build()
    {
        for (int i = 0 ; i < n ; ++i)
        {
            normalHash[i][0] = s[i] - 'a' + 1;
            for (int lgH = 0 ; lgH < 2 * MAXLOG ; ++lgH)
            {
                danceHash[i][0][lgH] = s[i] - 'a' + 1;
            }
        }

        for (int lgLen = 1 ; (1 << lgLen) <= n ; ++lgLen)
        {
            for (int i = 0 ; i + (1 << lgLen) <= n ; ++i)
            {
                normalHash[i][lgLen] = (1LL * base[(1 << lgLen - 1)] * normalHash[i][lgLen - 1] + normalHash[i + (1 << lgLen - 1)][lgLen - 1]) % MOD;
                for (int lgH = 0 ; lgH + 1 < MAXLOG ; ++lgH)
                {
                    danceHash[i][lgLen][lgH] = (1LL * base[1 << lgH] * danceHash[i][lgLen - 1][lgH + 1] + danceHash[i + (1 << lgLen - 1)][lgLen - 1][lgH + 1]) % MOD;
                }
            }        
        }
    }

    int query(int idx, int log)
    {
        return normalHash[idx][log] == danceHash[idx][log][0];
    }
};

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

    base[0] = 1;
    for (int i = 1 ; i < 3 * MAXN ; ++i)
    {
        base[i] = (27LL * base[i - 1]) % MOD;
    }

    sparse.build();
}

int query(int idx, int log) 
{
    return sparse.query(idx, log);
}

Compilation message

brperm.cpp: In member function 'void Sparse::build()':
brperm.cpp:37:64: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   37 |                 normalHash[i][lgLen] = (1LL * base[(1 << lgLen - 1)] * normalHash[i][lgLen - 1] + normalHash[i + (1 << lgLen - 1)][lgLen - 1]) % MOD;
      |                                                          ~~~~~~^~~
brperm.cpp:37:126: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   37 |                 normalHash[i][lgLen] = (1LL * base[(1 << lgLen - 1)] * normalHash[i][lgLen - 1] + normalHash[i + (1 << lgLen - 1)][lgLen - 1]) % MOD;
      |                                                                                                                        ~~~~~~^~~
brperm.cpp:40:133: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   40 |                     danceHash[i][lgLen][lgH] = (1LL * base[1 << lgH] * danceHash[i][lgLen - 1][lgH + 1] + danceHash[i + (1 << lgLen - 1)][lgLen - 1][lgH + 1]) % MOD;
      |                                                                                                                               ~~~~~~^~~
brperm.cpp:29:38: warning: iteration 20 invokes undefined behavior [-Waggressive-loop-optimizations]
   29 |                 danceHash[i][0][lgH] = s[i] - 'a' + 1;
      |                 ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
brperm.cpp:27:36: note: within this loop
   27 |             for (int lgH = 0 ; lgH < 2 * MAXLOG ; ++lgH)
      |                                ~~~~^~~~~~~~~~~~
/usr/bin/ld: /tmp/cc25WJrg.o:(.bss+0x0): multiple definition of `s'; /tmp/ccOsV5Bj.o:(.bss+0x326d31a0): first defined here
collect2: error: ld returned 1 exit status