题解 | 字符串哈希

import sys
def solve():
    try:
        line=sys.stdin.readline()
        if not line:
            return
        N=int(line.strip())
    except ValueError:
        return
    
    countstring=set()
    for _ in range(N):
        line=sys.stdin.readline().strip()
        countstring.add(line)
    
    print(len(countstring))

if __name__=="__main__":
    solve()