Submission #1060497

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060497		presko	Brperm (RMI20_brperm)	C++14	0 / 100	3019 ms	91932 KiB

brperm

#include<bits/stdc++.h>
#include "brperm.h"
#define MAXN 500010
#define LOGN 23
using namespace std;
long long tab[MAXN][LOGN];
string str="";

//transition: x-> r*(2^(k-bits)), bits=log2(x), r=transition for x in base form
//unchanged: 2^(k/2)*fl, fl=1 for k%2=0, otherwise fl=2
//changed: (2^k - unchanged)/2
void init(int n, const char s[])
{
    str=s[0];
    for(int j=0;j<=20;j++){tab[0][j]=0;}
    for(int i=1;i<n;i++)
    {
        str+=s[i];
        int logx=log2(i)+1;
        int si=i,cntr=1;
        long long m=0;
        while(si>0)
        {
            bool bit=si&1;
            long long ncalc=logx-cntr;
            ncalc=1<<ncalc;
            m+=bit*ncalc;
            si>>=1;
            cntr++;
        }
        tab[i][logx]=m;
        for(int j=logx+1;j<=20;j++)
        {
            tab[i][j]=tab[i][j-1]<<1;
        }
    }
}

int query(int i, int k)
{
    int lim=(1<<k);
    for(int curr=0;curr<lim;curr++)
    {
        if(i+curr>=str.size())return 0;
        if(str[i+curr]!=str[i+tab[curr][k]])return 0;
    }
    return 1;
}

Compilation message (stderr)

brperm.cpp: In function 'int query(int, int)':
brperm.cpp:44:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         if(i+curr>=str.size())return 0;
      |            ~~~~~~^~~~~~~~~~~~

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