解题思路:
注意事项:
参考代码:
def isprime(x): ls=[1,3,7,9] lis=[2,3,5,7] if x <1: return 0 elif 1<=x<10: if x in lis: return 1 else: return 0 else: if int(str(x)[-1:]) not in ls: return 0 else: s = 0 for i in range(2,x//2+1): if x%i==0: s += 1 break if s == 0: return 1 else: return 0 b,s= map(int,input().split()) ls=list(map(int,input().split())) ls.sort() sn=ls[s-1] bn=ls[::-1][s-1] if isprime(bn-sn): print('YES') else: print('NO') print(bn-sn)
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