#include <iostream> #include <vector> #include <algorithm> #include <array> #include <iterator> #include <string> #include <cctype> #include <cstring> #include <cstdlib> #include <cassert> #include <cmath> #include <ctime> #include <iomanip> #include <numeric> #include <stack> #include <queue> #include <map> #include <unordered_map> #include <set> #include <unordered_set> #include <bitset> #include <random> #include <utility> #include <functional> using namespace std; void Main() { int N; cin >> N; const long long M = (long long)5e17; vector<long long> A(N),B(N); for(int i = 0;i < N;i++) { cin >> A[i] >> B[i]; } vector<int> ord(N); iota(ord.begin(),ord.end(),0); sort(ord.begin() + 1,ord.end(),[&](int i,int j) { return max(abs(A[i] - M),abs(B[i] - M)) > max(abs(A[j] - M),abs(B[j] - M)); }); vector<pair<int,int>> ans; for(int i = 1;i < N;i++) { ans.push_back(make_pair(1,ord[i] + 1)); } cout << ans.size() << "\n"; for(int i = 0;i < (int)ans.size();i++) { cout << ans[i].first << " " << ans[i].second << "\n"; } } int main() { ios::sync_with_stdio(false); cin.tie(nullptr); int tt = 1; /* cin >> tt; */ while(tt--) Main(); }