16 lines
225 B
Python
16 lines
225 B
Python
n=int(input())
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arr=[]
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for _ in range(n):
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arr.append(tuple(map(int,input().split())))
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arr.sort(key=lambda x:(x[1],x[0]))
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last=0
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count=0
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for i in arr:
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if i[0] >= last:
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count+=1
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last=i[1]
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print(count) |