15 lines
338 B
Python
15 lines
338 B
Python
#!/usr/bin/env python3
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from collections import defaultdict
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for _ in range(int(input())):
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n = int(input())
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s = map(int, input().split())
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d = defaultdict(int)
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for i in s: d[i] += 1
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result = 0
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for value in s.values():
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if value % 2:
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pass
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else:
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result += value * (value-1) // 2
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