ACM思维题训练集合 The Little Elephant has two permutations a and b of length n, consisting of numbers from 1 to n, inclusive. Let’s denote the i-th (1 ≤ i ≤ n) elemen...
You are given an array consisting of n non-negative integers a 1, a 2, …, a n.
There are n piles of pebbles on the table, the i-th pile contains a i pebbles. Your task is to paint each pebble using one of the k given colors so that for eac...
You are given a permutation of length n. Recall that the permutation is an array consisting of n distinct integers from 1 to n in arbitrary order. For example, ...