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[AtCoder]ABC-181|B - Trapezoid Sum
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提出結果
def getInt():
return int(input())
def getIntListRow(N):
return [list(map(int, input().split())) for _ in range(N)]
def main():
n = getInt()
l = getIntListRow(n)
s = 0
for a, b in l:
c = b - a + 1
s += (a + b) * c // 2
print(s)
if __name__ == "__main__":
main()
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