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- #include <iostream>
- #include <vector>
- int main() {
- int a, b;
- std::cin>>a>>b;
- int map[a][a];
- bool f = false;
- std::vector<std::pair<int, int>> pairs;
- int j,k;
- for (int x = 0; x < b; x++) {
- std::cin>>j>>k;
- for (int i = 0; i < pairs.size(); i++) {
- if (pairs[i].first == j+1 && pairs[i].second == k+1) {
- f = true;
- break;
- }
- }
- pairs.push_back(std::pair<int,int>(j+1,k+1));
- }
- if (f) {
- std::cout<<"YES"<<std::endl;
- } else {
- std::cout<<"NO"<<std::endl;
- }
- return 0;
- }
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