［AtCoder］ABC-159｜A - The Number of Even Pairs

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• 🔗ABC-159 A - The Number of Even Pairs

提出結果

import math


def getIntMap():
    return map(int, input().split())


def main():
    n, m = getIntMap()

    print(math.comb(n, 2) + math.comb(m, 2))


if __name__ == "__main__":
    main()