R_xiaozhu_Q的专栏

import java.util.ArrayList;import java.util.Arrays;import java.util.HashMap;import java.util.Scanner;class UF{ private int[] id; private int count; public UF(int N) { count = N; id = n

Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations:get and set.get(key) - Get the value (will always be positive) of the key if t

Definition of Inversion: Let (A[0], A[1] ... A[n], n A[j], then the pair (i, j) is called inversion of A.Example:Count(Inversion({3, 1, 2})) = Count({3, 1}, {3, 2}) = 2思路，如果用brute force，则O（n^2）

时间限制:2000ms单点时限:200ms内存限制:256MB描述Given N arithmetic expressions, can you tell whose result is closest to 9?输入Line 1: N (1 Line 2..N+1: Each line contains an expression in the f