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- #include <iostream>
- using namespace std;
- int dist2(int xa, int ya, int xb, int yb) {
- return (xa-xb)*(xa-xb) + (ya-yb)*(ya-yb);
- }
- int main() {
- int x[4], y[4];
- for(int i = 0; i < 4; ++i) {
- cin >> x[i] >> y[i];
- }
- int d1 = 0, d2 = 0;
- for(int i = 0; i < 4; ++i) {
- for(int j = i+1; j < 4; ++j) {
- int d = dist2(x[i], y[i], x[j], y[j]);
- if(d1 == 0 || d1 == d) {
- d1 = d;
- }
- else if(d2 == 0 || d2 == d) {
- d2 = d;
- }
- else {
- cout << "Nu\n";
- return 0;
- }
- }
- }
- cout << "Da\n";
- return 0;
- }
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