Submission #596597

#	Time	Username	Problem	Language	Result	Execution time	Memory
596597		Deepesson	Brperm (RMI20_brperm)	C++17	50 / 100	3040 ms	22708 KiB

brperm

#include <bits/stdc++.h>
#define MAX 505000

void init(int n, const char s[]);
int query(int i, int k);

int inverte(int x,int k){
    int ans=0;
    for(int i=0;i!=k;++i){
        int u = (k-1)-i;
        if((1<<i)&x)ans+=1<<u;
    }
    return ans;
}
int pec[MAX][20];
int lim;
char vals[MAX];
void init(int n, const char s[]) {
    for(int j=0;j!=n;++j){
        vals[j]=s[j];
    }
    for(int i=0;i!=20;++i){
        int sz = 1<<i;
        if(sz>MAX)break;
        for(int k=0;k!=sz;++k){
            pec[k][i]=inverte(k,i);
        }
    }
    lim = n;
}

int query(int i, int k) {
    int sz = 1<<(k);
    if(i+sz>lim)return 0;
    int count=0;
    for(int j=0;j!=sz;++j){
        int mirror = pec[j][k];
        count++;
        if(vals[mirror+i]!=vals[j+i])return 0;
        if(count==505)break;
    }
    for(int u=0;u!=500;++u){
        int x = rand()%sz;
        int mirror = pec[x][k];
        if(vals[mirror+i]!=vals[x+i])return 0;
    }
    return 1;
}

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