Java面试问题之五十_JAVA_编程开发_程序员俱乐部

Question: Provide a function to accept an integer array and computes the maximum consecutive sum. If the maximum sum is negative, this function returns zero.


问题：请一个整数数组的最大连续和，若和小于零则返回零。

实现代码：

public class ConsecutiveSum {
        public int max_sum(int[] x){
                int max_ending_here = 0;
                int max_so_far = 0;
                int i;
                int n = x.length;

                for(i=0;i<n;++i){
                        if(max_ending_here+x[i]<0) {
                                max_ending_here = 0;
                        }else{
                                max_ending_here += x[i];
                        }
                        if(max_ending_here > max_so_far){
                                max_so_far = max_ending_here;
                        }
                }
                return max_so_far;
        }

        public static void main(String[] args){
                int[] x= new int[] {2,-3,1,-1,3,-2,-3,3};
                int i,n=x.length;
                System.out.println("Maximun Consecutive Elements Sum Program");
                System.out.println("========================================");
                System.out.println("Given Array : ");

                for(i=0;i<n;++i) {
                        System.out.print(x[i]+" ");
                }

                System.out.println();
                System.out.println("Maximum Sum is "+new ConsecutiveSum().max_sum(x));
        }
}

运行结果：
Lab-Computer-0db2f6:~ labuser$ java ConsecutiveSum
Maximun Consecutive Elements Sum Program
========================================
Given Array :
2 -3 1 -1 3 -2 -3 3
Maximum Sum is 3