Don't ever underestimate the amount of time a coffee break takes. When attempting to figure out how much time will some task takes from you, add 50% to your initial assesment.
Don't think the super hard problem you are facing is unique. In fact, there's at least 90% chance Someone have already solved it and posted the solution somewhere. Learn how to use search engines to minimize the time and effort you invest in each problem.
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Don't use shift-delete on a windows system. Ever.
Don't ever underestimate the amount of time a coffee break takes. When attempting to figure out how much time will some task takes from you, add 50% to your initial assesment.
Don't think the super hard problem you are facing is unique. In fact, there's at least 90% chance Someone have already solved it and posted the solution somewhere. Learn how to use search engines to minimize the time and effort you invest in each problem.