BTW, IQ tests are, even if occasionally legal (seems they aren't necessarily illegal, but sometimes illegal in the USA depending on circumstances), are pretty u

BTW, IQ tests are, even if occasionally legal (seems they aren't necessarily illegal, but sometimes illegal in the USA depending on circumstances), are pretty unethical given that IQ is poorly correlated with what you're trying to measure (G), but it you don't trust me, trust Nasim Taleb: https://medium.com/incerto/iq-is-largely-a-pseudoscientific-swindle-f131c101ba39 https://medium.com/incerto/iq-is-largely-a-pseudoscientific-... You should not be trying to approximate an IQ test (and leetcode does exactly this).