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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int g,h,t,nt=0;
- scanf("%d",&t);
- int wq[t+3],ew[t+3],k[t+3]={0};
- for(g=0;g<t;g++)scanf("%d",&wq[g]);
- for(g=0;g<t;g++)scanf("%d",&ew[g]);
- for(g=h=0;g<t&&h<t;g++,h++){
- while(k[wq[g]]&&g<t)g++;
- while(wq[g]!=ew[h]&&h<t)
- k[ew[h]]=1,h++,nt++;
- }
- printf("%d\n",nt);
- return 0;
- }
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