- https://gateoverflow.in/357468/gate-cse-2021-set-1-ga-question-9 β Must be debated, C;D should be given marks. Probability of success 70%. Ambiguity can be seen in different answers here. Also as per the interpretation of the options used for the answer key if either A or B option was true, then C will also be true. So, it is natural for anyone to interpret C option in a different way. Similar question from GATE EC 2021 having a different answer: https://ec.gateoverflow.in/1617/gate-ec-2021-ga-question-6
- https://gateoverflow.in/357422/gate-cse-2021-set-1-question-29 β Typo. Can be debated but ideally no change should happen (will adversely affect those who got this correct) and expected
- https://gateoverflow.in/357496/gate-cse-2021-set-2-question-44 β Ambiguous. A;D and B;C must be given marks. Probability of success 50%. Explanation here
- https://gateoverflow.in/357537/gate-cse-2021-set-2-question-3 β Ambiguous as the rule is violating C grammar and hence should be checked in syntax analysis phase. But the issue here is typedef needs to handled before this and this needs the power outside of CFG. The ambiguity here is whether syntax-analysis does this typedef check with limited CSG power or does syntax check gets pushed to semantic phase. Both are possible in practical implementation and so both should be given marks. More details. Probability of success 30%. (compiler people are hard to convince)