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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const int maxN=1e5+10;
  4. int N,K,Q;
  5. int bat_dau_ranh[maxN],het_ranh[maxN],B[maxN],sum[maxN];
  6. int main(){
  7.     ios_base::sync_with_stdio(0);
  8.     cin.tie(0);
  9.     cin>>N>>K>>Q;
  10.     for(int i=1;i<=N;++i){
  11.         int l,r;
  12.         cin>>l>>r;
  13.         ++bat_dau_ranh[l];++het_ranh[r+1];
  14.     }
  15.     // khoi tao mang B
  16.     int HS=0;
  17.     for(int i=1;i<maxN;++i){
  18.         HS+=bat_dau_ranh[i];
  19.         HS-=het_ranh[i];
  20.         if(HS>=K)B[i]=1;
  21.         else B[i]=0;
  22.     }
  23.     // khoi tao prefix sum cua mang B
  24.     for(int i=1;i<maxN;++i)sum[i]=sum[i-1]+B[i];
  25.     // tra loi truy van
  26.     for(int i=1;i<=Q;++i){
  27.         int l,r;
  28.         cin>>l>>r;
  29.         cout<<sum[r]-sum[l-1]<<"\n";
  30.     }
  31. }
  32.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/33p2Qf
language:
C++14 (clang 8.0)
created:
1 day ago
visibility:
public

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