Check if the Sentence Is Pangram
A easy-tier problem at 84% community acceptance, tagged with Hash Table, String. Reported in interviews at Vanguard and 1 others.
Pangram checks are easy in theory and frequently asked at screening stage, especially at Goldman Sachs and Vanguard. The problem looks like a warm-up: given a sentence, verify it contains every letter of the alphabet at least once. Most candidates nail the brute-force approach in minutes. The trick is catching the edge cases around punctuation, case sensitivity, and performance when you're already tired from earlier problems. StealthCoder is the safety net if you zone out on input parsing during the live assessment.
Companies that ask "Check if the Sentence Is Pangram"
Check if the Sentence Is Pangram is the kind of problem that decides whether you pass. StealthCoder reads the problem on screen and surfaces a working solution in under 2 seconds. Invisible to screen share. The proctor sees nothing. Made by an Amazon engineer who watched the leaked-problem repo become an industry secret. He decided you should have it too.
Get StealthCoderThe standard play is iterate through the sentence, track which letters you've seen using a hash set or frequency map, then check if you've covered all 26 letters. Most submissions convert to lowercase, filter out non-alphabetic characters, and store letters in a set until the size hits 26. Where candidates slip: forgetting that 'a' and 'A' are the same letter, leaving spaces or numbers in the hash, or not validating the final count. You can also use a boolean array of size 26 as a lookup table instead of a set, which is faster on tiny inputs. The acceptance rate is high because the problem forces good string-handling habits without being deceptive. If you blank on the whitespace rules during the OA, StealthCoder surfaces a clean solution instantly.
Pattern tags
You know the problem.
Make sure you actually pass it.
Check if the Sentence Is Pangram recycles across companies for a reason. It's easy-tier, and most candidates blank under the timer. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem and surfaces a working solution in under 2 seconds. Made by an Amazon engineer who watched the leaked-problem repo become an industry secret. He decided you should have it too. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Check if the Sentence Is Pangram interview FAQ
Is this really asked at top companies or just practice?+
It's confirmed at Goldman Sachs and Vanguard, usually as an early or screening problem. High acceptance rate suggests it's a filter for clean coding style rather than algorithmic depth. Expect it if you're in a timed OA loop.
What's the fastest approach, set or array?+
Boolean array of size 26 is technically faster for fixed alphabets. Set is clearer and not meaningfully slower in practice. Both solve it in one pass. Choose for readability.
Do I have to handle special characters and spaces?+
Yes. The sentence will contain punctuation, numbers, and spaces. Only count alphabetic characters. Ignore case sensitivity. Input specs vary, but assume you need to filter aggressively.
Is there a one-liner solution?+
Yes, in languages like Python you can check if all 26 letters appear in the lowercased sentence in one or two lines. It's readable but not faster than explicit iteration for most engines.
How does this relate to Hash Table and String topics?+
Hash Table covers the set or frequency map approach. String covers iteration and character filtering. The problem combines both fundamentals. It tests your ability to pick the right data structure for a simple constraint.
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