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  1. //Lib
  2. #include<cstdio>
  3. #include<cstring>
  4. #include<cstdlib>
  5. #include<cmath>
  6. #include<ctime>
  7.  
  8. #include<iostream>
  9. #include<algorithm>
  10. #include<vector>
  11. #include<string>
  12. #include<queue>
  13. #include<set>
  14. #include<map>
  15. using namespace std;
  16. //Macro
  17. #define rep(i,a,b)  for(int i=a,tt=b;i<=tt;++i)
  18. #define drep(i,a,b) for(int i=a,tt=b;i>=tt;--i)
  19. #define erep(i,e,x) for(int i=x;i;i=e[i].next)
  20. #define irep(i,x)   for(__typeof(x.begin()) i=x.begin();i!=x.end();i++)
  21. #define read()  (strtol(ipos,&ipos,10))
  22. #define sqr(x)  ((x)*(x))
  23. #define pb  push_back
  24. #define PS  system("pause");
  25. typedef long long   ll;
  26. typedef pair<int,int> pii;
  27. const int oo=~0U>>1;
  28. const double inf=1e100;
  29. const double eps=1e-6;
  30. string name="", in=".in", out=".out";
  31. //Var
  32. struct SEG
  33. {
  34.     int l,r,idx;
  35.     bool operator<(const SEG &o)const{return r<o.r;}
  36. }seg[200008];
  37. struct BIT
  38. {
  39.     const static int limit=50000;
  40.     int s[50008];
  41.     BIT(){memset(s,0,sizeof s);}
  42.     inline int lowbit(int x){return x&-x;}
  43.     void Update(int l,int r)
  44.     {
  45.         for(int i=l;i<=limit;i+=lowbit(i))s[i]++;
  46.         for(int i=r+1;i<=limit;i+=lowbit(i))s[i]--;
  47.     }
  48.     int Query(int x)
  49.     {
  50.         int ret=0;
  51.         for(int i=x;i>0;i-=lowbit(i))ret+=s[i];
  52.         return ret;
  53.     }
  54. }T;
  55. int n,m,pos;
  56. int ball[50008],ans[200008],pre[1000008];
  57. void Init()
  58. {
  59.     scanf("%d",&n);
  60.     rep(i,1,n)scanf("%d",ball+i);
  61.     scanf("%d",&m);
  62.     rep(i,1,m)scanf("%d%d",&seg[i].l,&seg[i].r),seg[i].idx=i;
  63.     sort(seg+1,seg+1+m);
  64. }
  65. void Work()
  66. {
  67.     pos=1;
  68.     rep(i,1,n)
  69.     {
  70.         T.Update(pre[ball[i]]+1,i);
  71.         while(seg[pos].r==i)
  72.             ans[seg[pos].idx]=T.Query(seg[pos].l),pos++;
  73.         pre[ball[i]]=i;
  74.     }
  75.     rep(i,1,m)printf("%d\n",ans[i]);
  76. }
  77. int main()
  78. {
  79. //  freopen((name+in).c_str(),"r",stdin);
  80. //  freopen((name+out).c_str(),"w",stdout);
  81.     Init();
  82.     Work();
  83.     return 0;
  84. }
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https://ideone.com/5HnDw
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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