题解 | #序列找数#
序列找数
http://www.nowcoder.com/practice/a7d1856a72404ea69fdfb5786d65539c
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int sum = ((n + 1) * n) >> 1;
for(int i = 0; i < n; i++) {
sum -= sc.nextInt();
}
System.out.println(sum);
}
}
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