Submission #478269

#	Time	Username	Problem	Language	Result	Execution time	Memory
478269		stefantaga	Brperm (RMI20_brperm)	C++14	50 / 100	965 ms	262144 KiB

brperm

#include "brperm.h"
#include <cstring>
#include <bits/stdc++.h>
#define baza 31
#define MOD 1000000007
using namespace std;
long long invers[500005][21];
long long hash1[500005][21];
char v[500005];
long long put[25];
void init(int n, const char s[]) {
    int i,j;
    put[0]=baza;
    for (i=1;i<=19;i++)
    {
        put[i]=(1LL*put[i-1]*put[i-1])%MOD;
    }
    for (i=0;i<n;i++)
    {
        invers[i][0]=s[i]-'a';
    }
    for (int i=1;i<=19;i++)
    {
        for (j=0;j+(1<<i)-1<n;j++)
        {
            invers[j][i]=(invers[j][i-1]+(1LL*invers[j+(1<<(i-1))][i-1]*put[19-i])%MOD)%MOD;
        }
    }
    for (i=0;i<=19;i++)
    {
        for (j=n-1;j>=0;j--)
        {
            hash1[j][i]=((s[j]-'a')+1LL*hash1[j+1][i]*put[19-i])%MOD;
        }
    }
}

int query(int i, int k) {
  long long ceau1=(hash1[i][k]-(1LL*hash1[i+(1<<k)][k]*put[19])%MOD+MOD)%MOD;
  long long ceau2=invers[i][k];
  return ceau1==ceau2;
}

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