2024-06-10 12:07:24
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int[] left = new int[n];
int[] right = new int[n];
for (int i = 0; i < n; i++) {
left[i] = scanner.nextInt();
right[i] = scanner.nextInt();
}
int sumLeft = 0;
int sumRight = 0;
for (int i = 0; i < n; i++) {
sumLeft += left[i];
sumRight += right[i];
}
if (sumLeft % 2 == 0 && sumRight % 2 == 0) {
System.out.println(0);
return;
}
boolean possible = false;
for (int i = 0; i < n; i++) {
int newSumLeft = sumLeft - left[i] + right[i];
int newSumRight = sumRight - right[i] + left[i];
if (newSumLeft % 2 == 0 && newSumRight % 2 == 0) {
possible = true;
break;
}
}
if (possible) {
System.out.println(1);
} else {
System.out.println(-1);
}
}
}
3.8K views09:07
A
