Freaks City

Given an n × m chessboard (with 1 < n, m ≤ 400) and the starting position of a knight, determine the minimum number of moves required for the knight to reach every other square. If a square is unreachable, output -1. Input Format A single line containing four integers: n, m, start_x, and start_y. Output Format Print an n × m matrix. Each val ...

A - Shout Everyday This problem involves checking if a specific hour falls within a given time range spanning across midnight. We handle the wrap-around by adjusting the end time. #include <cstdio> int main() { int target, start, end; scanf("%d %d %d", &target, &start, &end); if (end <= start) en ...

Problem Analysis: Digit DP Before explaining the correct solution, let's first discuss the partial score approach. For 50% of the data, where (1 \le L, R \le 10^6), a brute force simulation might be feasible. However, since we don't know the exact positions where each number appears, directly simulating with a 2D array is likely to cause memory ...

A building has an unusual elevator system. Each floor i (where 1 ≤ i ≤ N) has a fixed value K[i], which determines how many floors the elevator moves when the "up" or "down" button is pressed. The elveator can only move up by K[i] floors or down by K[i] floors from floor i. If the target floor would be below 1 or above N, th ...

Given an n × n chessboard, place n queens so that no two attack each other. A valid placement guarantees exactly one queen per row and per column, and at most one queen on every diagonal (both positive and negative slopes). The task is to enumerate every valid configuration, print the first three in lexicographical order, and finally output the ...

Given an array of integers candidates and a target value target, find all unique combinations in candidates where the numbers sum to target. Key constraints: Each number can only be used once in each combination. All numbers (including the target) are positive integers. The result set must not contain duplicate combinations. Examples Example ...

Problem 491: Non-decreasing Subsequences Given an integer array nums, return all the different non-decreasing subsequences that have atleast two elements. The answer can be in any order. When two integers are equal, this counts as a valid increasing sequecne. Example 1: Input: nums = [4,6,7,7] Output: [[4,6],[4,6,7],[4,6,7,7],[4,7],[4,7,7],[6,7 ...

A: Chessboard Rook Placement Given an (n \times n) board where certain positions marked # allow placement, determine the number of ways to place (k) identical, non-attacking rooks. Constraints: (k \leq n \leq 8). Since each row can hold at most one rook, a depth-first search over rows is feasible. The state space is bounded by ((n+1)^n), at mos ...