Submission #3642289

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Source Code Expand

n=int(input())
words=[]
gm='YES'
rep='YES'
for i in range(n):
    c=input()
    words.append((len(c),c))

for i in range(n-1):
    a=words[i][1]
    b=words[i+1][1]
    if b[0]==a[len(a)-1]:
        gm='YES'
        continue
    else:
        gm='NO'
        break
words=sorted(words)
for i in range(n-1):
    if words[i][0]==words[i+1][0]:
        if words[i][1]==words[i+1][1]:
            rep='NO'
            break
if rep=='YES'and gm=='YES':
    print(rep)
else:
    print('NO')

Submission Info

Judge Result