Submission #596581

#	Time	Username	Problem	Language	Result	Execution time	Memory
596581		Deepesson	Brperm (RMI20_brperm)	C++17	50 / 100	33 ms	44128 KiB

brperm

#include <bits/stdc++.h>
#define MAX 205000

void init(int n, const char s[]);
int query(int i, int k);
int prefsum[MAX][26];
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 lim;
char vals[MAX];
void init(int n, const char s[]) {
    for(int j=0;j!=n;++j){
        vals[j]=s[j];
        for(int k=0;k!=26;++k){
            prefsum[j+1][k]=prefsum[j][k];
        }
        prefsum[j+1][s[j]-'a']++;
    }
    lim = n;
}
int count=0;
int query(int i, int k) {
    int sz = 1<<(k);
    if(i+sz>lim)return 0;
    int r=i+sz-1;
    for(int j=0;j!=sz;++j){
        int mirror = inverte(j,k);
        if(vals[mirror+i]!=vals[j+i])return 0;
        ++count;
        if(count==25000)break;
    }
    return 1;
}

Compilation message (stderr)

brperm.cpp: In function 'int query(int, int)':
brperm.cpp:32:9: warning: unused variable 'r' [-Wunused-variable]
   32 |     int r=i+sz-1;
      |         ^

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