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B. Square Filling time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output You are given two matrices 𝐴 and 𝐵. Each matrix contains exactly 𝑛 rows and 𝑚 columns. Each element of 𝐴 is either 0 or 1; each element of 𝐵 is initially 0. You may perform some operations with matrix 𝐵. During each operation, you choose any submatrix of 𝐵 having size 2×2, and replace every element in the chosen submatrix with 1. In other words, you choose two integers 𝑥 and 𝑦 such that 1≤𝑥<𝑛 and 1≤𝑦<𝑚, and then set 𝐵𝑥,𝑦, 𝐵𝑥,𝑦+1, 𝐵𝑥+1,𝑦 and 𝐵𝑥+1,𝑦+1 to 1. Your goal is to

1.“==” 只比较地址 2.“equal” 对于String类型比较的是值，因为String类里面的equal重写了，和其他的类内有所区别。除去String 其他的比较多也是地址 3.基本数据类型 之间的 比较 只能是 “==” 4.对于基本类型的包装类，比如Boolean、Character、Byte、Shot、Integer、Long、Float、Double等的引用变量，==比较地址的，而equals比较值。 来源： https://www.cnblogs.com/llft/p/11381712.html

B.Equal Rectangles time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output You are given 4𝑛 sticks, the length of the 𝑖-th stick is 𝑎𝑖. You have to create 𝑛 rectangles, each rectangle will consist of exactly 4 sticks from the given set. The rectangle consists of four sides, opposite sides should have equal length and all angles in it should be right. Note that each stick can be used in only one rectangle. Each stick should be used as a side, you cannot break the stick or use it not to the full length. You want to all rectangles to have equal

EQ 就是 EQUAL等于 NQ 就是 NOT EQUAL不等于 GT 就是 GREATER THAN大于 LT 就是 LESS THAN小于 GE 就是 GREATER THAN OR EQUAL 大于等于 LE 就是 LESS THAN OR EQUAL 小于等于 转载于:https://www.cnblogs.com/hesijian/p/6992846.html 来源： https://blog.csdn.net/weixin_30325487/article/details/99367146