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  1. #include<iostream>
  2. #include<math.h>
  3. #include<iomanip>
  4. #include<string>
  5. #include<algorithm>
  6. #include<map>
  7. #include<stack>
  8. #include<deque>
  9. #include<cstdio>
  10. #include<queue>
  11. #include<fstream>
  12. using namespace std;
  13. int main() {
  14.  ifstream cin("hobby.in");
  15.  ofstream cout("hobby.out");
  16.  int n,i,j,m,z,x;
  17.  pair< int,pair<int,int> >a[1005];
  18.  cin>>n;
  19.  for(i=0;i<n;i++) {
  20.   cin>>a[i].first>>a[i].second.first;
  21.   a[i].second.second=i+1;
  22.  }
  23.  sort(a+0,a+n);
  24.  cout<<n/2<<endl;
  25.  for(i=1;i<n;i+=2) {
  26.   cout<<a[i-1].second.second<<" "<<a[i].second.second<<endl;
  27.  }
  28.  return 0;
  29. }
Success #stdin #stdout 0s 3472KB
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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/GaCAIx
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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