A few years ago I solved 200 LeetCode problems and still froze on Mediums I hadn't seen. The breakthrough wasn't another hundred problems. It was a different loop. A problem asks for the longest substring with at most K distinct characters. You've solved sliding window before. Maximum sum subarray of size K, done. Longest substring without repeating characters, done. This third one stalls you. Twe
April is one of those months where the tool discovery inbox fills up faster than usual. Partly it's spring project energy, partly it's that the no-account tools space keeps expanding in genuinely interesting directions. This month's picks share a pattern: they're not stripped-down versions of paid products. They're tools where removing the account requirement made them better — faster to access, s