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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n,q,x,y;
  6.     cin>>n;
  7.     vector<int>v(n),frq(1000006);
  8.     for(int &i:v)cin>>i;
  9.     int l=-1,r=-1,ans=0;
  10.     cin>>q;
  11.     while(q--) {
  12.         cin>>x>>y;
  13.         x--,y--;
  14.         if(l==-1||y<=l||x>=r) {
  15.             l=r=x;
  16.             while(r<=y)ans+=(frq[v[r]]++==0),r++;
  17.             r--;
  18.         }
  19.         else {
  20.             while(l<x)ans-=(--frq[v[l]]==0),l++;
  21.             while(l>x)ans+=(frq[v[l-1]]++==0),l--;
  22.             while(r<y)ans+=(frq[v[r+1]]++==0),r++;
  23.             while(r>y)ans-=(--frq[v[r]]==0),r--;
  24.         }
  25.         cout<<ans<<endl;
  26.     }
  27. }
  28.  
Success #stdin #stdout 0.01s 7252KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/yLnZGS
problem DQUERY, based on SPOJ submission 34458283 (CPP14), 2025-04-17 11:05:20
language:
C++14 (gcc 8.3)
created:
10 days ago
visibility:
public

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