Voltoku Hounut

People practising algorithms keep re-solving the same problem from scratch, because they forget which approach failed, why, and what finally worked. Scattered notes never show the pattern - that your usual stuck point is picking the wrong technique, or that graph topics keep tripping you up. Voltoku Hounut catches the struggle right after the session and turns it into a trail. LOG THE ATTEMPT, NOT JUST THE ANSWER Each attempt records how it ended - passed, wrong answer, too slow, gave up - the technique you reached for, where it broke down, and what finally unlocked it. Six stuck causes to choose from: misread, edge case, wrong technique, too slow, slip, blank. Add notes, a complexity guess and a photo of your sketch. THE PROBLEM TRAIL Every problem keeps its attempts as a vertical trail with colour-coded outcomes, its stuck-cause counts, and the technique that rescued it last time - so before you retry, you can read what already failed. THE TECHNIQUE ATLAS Techniques as a list with mastery, as a collapsible tree of five categories, or as a prerequisite graph you can pan and zoom - hold a node to trace what it depends on and what depends on it. Not sure which to reach for? Walk the yes-or-no decision tree. STATISTICS Over four weeks, three months or all time: a stuck-cause donut, solve rate by topic, attempts-to-solve bars, solved per week, the difficulty mix, your most rescuing techniques and the repeat offenders at four attempts or more. Each card says what it means in one line, and the lot exports as a PDF. SESSIONS, RANKS AND BADGES A practice journal of your sittings, a streak, and ranks you climb by solving problems and by using techniques you have not leaned on before. ON THE DEVICE All of it stays on your phone.