题解 | 调皮的依依
调皮的依依
https://www.nowcoder.com/practice/40ebefcc3dfa42cbb482ec1ef1a38b0e
# import sys
# for line in sys.stdin:
# a = line.split()
# print(int(a[0]) + int(a[1]))
n=int(input())
m=int(input())
lst=list(map(int,input().split()))
ary=[i for i in range(1,n+1)]
res=set(ary)-set(lst)
if len(res)==1 and sorted(lst)==lst:
print("Yes")
temp=list(res)
print(temp[0])
else:
print("No")
