# Front Running Detector Akuna Capital OA 2023 Solution

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## Front Running Detector Akuna Capital Solution

Front-running is defined as trading a stock or another financial asset by a broker who has inside knowledge of a future transaction that is about to affect its price substantially. It is illegal and unethical.

Here’s an example of front-running: Say a trader gets an order from a broker to buy 50,000 shares of Tesla. Such a huge purchase is bound to drive up the price of the stock immediately, at least in the short term. The trader sets aside the broker request for a minute and first buys some Tesla stock for their own portfolio. Then the broker’s order is executed. The trader could then immediately sell the Tesla shares and collect a profit. The trader has made a profit based on information that was not public knowledge.

A trade pair is considered front-running if all of the following conditions are met:

• a. One trade is of type “Broker” and the second trade is of type “Electronic”.
• b. The Electronic trade occurs 1 minute or less before the Broker trade.
• c. Both trades are for the same product.
• d. Both trades are of the same type (Call/Put).
• f. Both trades have the same expiry date.
• g. Both trades have the same strike price.

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Note: The incoming trades from CBOE do not have a side field, instead the quantity represents the side. A positive qty represents a buy and negative represents a sell.

Example:

• Trade1: (date = ‘2022-03-15’, time=9:01:00, type=Broker, qty=-500, strike-1500, expiry=’2022
04-28′, kind=P, exchange=CBOE, trade-id = 737acm, product=ABC)
• Trade2: (date = ‘2022-03-15’, time=9:00:24, type-Electronic, qty=-200, strike=1500,
• Trade3: (date = ‘2022-03-15′, time=9:03:45, type=Electronic, qty=-100, strike=1500, expiry=’2022-04-28’, kind-P, exchange=CBOE, trade-id = tssrin, product=ABC) [Fails condition
(b)]
• Trade4: (date = ‘2022-03-15′, time=9:00:53, type=Electronic, qty=-500, strike=1500, expiry=’2022-04-28’, Kind-P, exchange=CBOE, trade-id = Ik451a, product=XYZ) [Fails condition (c)]
• Trade5: (date = ‘2022-03-15′, time=9:00:05, type=Electronic, qty=-350, strike-1500, expiry=’2022-04-28’, Kind-C, exchange=CBOE, trade-id=9numpr, product=ABC) [Fails condition (d)]
• Trade6: (date = ‘2022-03-15′, time=9:00:35, type=Electronic, qty=200, strike=1500, expiry=’2022-04-28’, Kind-P, exchange=CBOE, trade-id=922v3g, product-ABC) [Fails condition (e)]
• Trade7: (date = ‘2022-03-15′, time=9:00:47, type=Electronic, qty=-150, strike=1500, expiry=’2022-04-21’, Kind-P, exchange=CBOE, trade-id=bg54nm, product=ABC) [Fails condition (f)]
• Trade8: (date = ‘2022-03-15′, time-9:02:23, type=Electronic, qty=-200, strike=1550, expiry=’2022-04-28’, Kind-P, exchange=CBOE, trade-id = 6y7fhm, product=ABC) [Fails condition (g)]

Output: [(‘737acm’, ‘w6c229’)]

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### SOLUTION

Program: Front Running Detector Akuna Capital Solution in Python

``````class FrontRunningDetector:
def init(self):
self.di = dict()
def process(self,s):
t = s.split(":")

if len(self.di) == 0:
self.di[(t[0], t[1])] = int(t[2])
return None
else:
for i, j in self.di.items():
ma = 0
if t[0] in i:
if t[0]==i[0]:
y = i[1]
else:
y = i[0]
ma = max(ma, ma + j + int(t[2]))
if t[1] in i:
if t[1] == i[0]:
y = i[0]
else:
y = i[1]
ma = max(ma, ma + j + int(t[2]))

self.di[(t[0], t[1])] = int(t[2])
A, B = sorted([y, t[1]])
return ":".join([str(ma),A,t[0],B])``````

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