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- #include <iostream>
- #include <random>
- #include <chrono>
- #define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
- using namespace std;
- mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
- //http://www.cplusplus.com/reference/random/uniform_int_distribution/
- int main(){
- int n, d;
- cin >> n >> d;
- //n will be <= 5e5, d will be <= 1e9
- set<pair<int, int>> vis;
- for(int i = 0; i<n; i++){
- int a = uid(1, d), b = uid(1, d);
- while(vis.count(make_pair(a, b))){
- a = uid(1, d), b = uid(1, d);
- }
- cout << a << " " << b << "\n";
- vis.insert(make_pair(a, b));
- }
- return 0;
- }
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