Submission #596533

#	Time	Username	Problem	Language	Result	Execution time	Memory
596533		ThegeekKnight16	Brperm (RMI20_brperm)	C++14	0 / 100	172 ms	5692 KiB

brperm

#include <bits/stdc++.h>
#include <brperm.h>
using namespace std;
const int MAXN = 5e5 + 10;
int Roupas[MAXN], pos[MAXN];
 
int findK(int num)
{
    for (int k = 20; k >= 0; k--) if (num & (1 << k)) return k;
  	return 0;
}
 
int inv(int num, int K)
{
    int resp = 0;
    for (int k = K; k >= 0; k--) resp += (num & (1 << k)) ? (1 << (K - k)) : 0;
    return resp;
}
 
int query(int X, int K)
{
    int Y = X + (1 << K) - 1;
    
    int maxK = findK(Y);
    
    //for (int i = X; i <= Y; i++) pos[i] = inv(i - X, maxK);
    
    for (int i = X; i <= Y; i++) if (Roupas[i] != Roupas[pos[i]]) {return 0;}
    return 1;
}
 
void init(int N, const char s[])
{
    for (int i = 0; i < N; i++) Roupas[i] = s[i];
    int K = findK(N-1);
    for (int i = 0; i < N; i++) pos[i] = inv(i, K);
}
 
/*int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    init(8, "axxyxxyb");
    cout << query(0, 2);
}*/

Compilation message (stderr)

brperm.cpp: In function 'int query(int, int)':
brperm.cpp:24:9: warning: unused variable 'maxK' [-Wunused-variable]
   24 |     int maxK = findK(Y);
      |         ^~~~

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