摘要：一开始用Integer 怎么都超时，发现用int 才能过。Equilibrium index of a sequence is an index such that the sum of elements at lower indexes is equal to the sum of elements at higher indexes.For example, in a sequence A:A[0]=-7 A[1]=1 A[2]=5 A[3]=2 A[4]=-4 A[5]=3 A[6]=0 3 is an equilibrium index, because:A[0]+A[1]+A[2]= 阅读全文

摘要：今天玩topcoder, 发现“两次减法操作”竟然比“一次2倍乘法和一次加法”要慢一秒。下面是例程。package practice;import java.util.Calendar;public class GuessinNextElement { public int guessSlow(int[] A) { boolean flag=true; if ((A[1]-A[0])==(A[2]-A[1])) flag=false; if (flag) return A[A.length-1]*(A[2]/A[1]); else return A[A.length-1... 阅读全文