This one looked manageable until I actually read the event ordering rules.
Model each player's movement as a function of time, where they move right at unit speed except when the watcher's gaze is directed at them, which freezes them. Precompute the watcher's gaze direction over time and for each player determine the total frozen duration by checking if their position falls within the watched segment during each gaze interval. Then compute the final position as initial position + (T - total_frozen_time), and count how many reach or exceed L.
Pro tip: Clarify the watcher's exact behavior: does the watcher look at a single point or a segment? If a segment, specify its length. Also confirm whether players can pass each other and if multiple players can occupy the same position. These details drastically affect the solution.
Ask about the watcher's field of view (point vs. segment), movement speed, whether players can overlap, and if they stop exactly at L or can overshoot. Confirm the input format for timestamps and positions.
Parse the alternating left/right timestamps into intervals with a direction. For each interval, determine the watched region (e.g., left of watcher or right of watcher) and the time duration.
For each player, iterate through the watcher's intervals. If the player's position at the start of an interval is within the watched region, they are frozen for that entire interval; otherwise, they move. Accumulate the total frozen time.
For each player, final position = initial position + (T - total_frozen_time). Count how many have final position >= L. Handle edge cases like players starting at L or beyond.
Discuss time complexity: O(N * K) where K is number of watcher intervals. Consider if K can be large and propose optimizations like sorting intervals or using binary search if needed.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.
Pretty standard but INT_MIN will break you if you just negate and go.
Start by clarifying the problem constraints and edge cases, then outline a digit-by-digit extraction using division and modulo. Handle negative numbers and the INT_MIN overflow case explicitly, and test with boundary values.
Pro tip: Mention that you would use a long or unsigned type to safely handle INT_MIN, showing awareness of overflow pitfalls that trip up many candidates.
Confirm that the input is a 32-bit signed integer and discuss edge cases like 0, negative numbers, and INT_MIN. Ask if the output should include a minus sign for negatives.
Check if the number is 0 and return '0'. For negative numbers, record the sign and convert to a positive value using a safe method (e.g., cast to long) to avoid overflow with INT_MIN.
Repeatedly take the number modulo 10 to get the least significant digit, convert it to a character, and prepend to the result. Then divide the number by 10 to move to the next digit.
After the loop, if the original number was negative, prepend a minus sign to the constructed string. Ensure the string is properly terminated if using C-style strings.
Verify the implementation with test cases: 0, positive numbers, negative numbers, INT_MAX, and INT_MIN. Walk through the logic to ensure no off-by-one errors or overflow.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.