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    Case file · Integer overflow · 1:35You saved 4 bytes a row. Now the fix takes up to 11 hours.▶ full lectureread it
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    W06 · Presence and chat · 1:11100,000 people in one chat: 10 billion notifications.▶ full lectureread it
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    Side quest 32 · ONDC · 1:06Ten rupees apart, and the money doesn't move▶ full lectureread it