i++ include void mes spa bit urn using pac

#include<bits/stdc++.h>using namespace std;int n;char a[100000];void make(){ for(int i=n-1;i;i--){ if(a[i*2]==‘B‘ && a[i*2+1]==‘B‘)a[i]=‘B‘; else if(a[i*2]==‘I‘ && a[i*2+1]==‘I‘)a[i]=‘I‘; else a[i]=‘F‘; }}void dfs(int o){ if(o*2<n*2)dfs(o*2); if(o*2+1<n*2)dfs(o*2+1); putchar(a[o]);}int main(){ scanf("%d",&n); getchar(); getchar(); n=(1<<n); for(int i=n;i<n*2;i++){ a[i]=getchar(); if(a[i]==‘1‘)a[i]=‘I‘; else a[i]=‘B‘; } make(); dfs(1); puts(""); return 0;}

luogo_1087 FBI樹