29 lines
501 B
Python
29 lines
501 B
Python
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#!/usr/bin/env python3
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import sys
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def xor_count(a, b):
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xor = a ^ b
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i = 0
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while xor != 0:
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i = i + (xor & 1)
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xor = xor >> 1
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return i
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def bitwise_difference(A):
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s = 0
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for i in range(len(A)):
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for j in range(i+1,len(A)):
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s = s + xor_count(A[i], A[j])
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return s
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if __name__ == "__main__":
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sys.stdin.readline()
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A = sys.stdin.readline().split()
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for i in range(len(A)):
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A[i] = int(A[i])
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print(bitwise_difference(A))
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