每日一题05

public class Solution {
    public int test (int[] nums)
    {
        int leftsum = 0;
        int rightsum = 0;
        for (int i : nums) //遍历数组，将和加给左侧值
            leftsum += nums[i];
        for (int j = 0;j < nums.length; j++)
        {
            leftsum -= nums[j]; //减去当前元素下标
            if (leftsum == rightsum) //判断左侧值是否等于右侧值
                return j;
            else
                rightsum += nums[j]; //不是就继续减左侧值,加给右侧值
        }
        return -1; //不存在中心下标
    }
}
public class Main {
    public static void main(String[] args) {
        int[] arr1 = new int[]{1,7,3,6,5,6};
        int[] arr2 = new int[]{1,2,3};
        int[] arr3 = new int[]{2,1,-1};
        Solution solution = new Solution();
        System.out.println(solution.test(arr1));
        System.out.println(solution.test(arr2));
        System.out.println(solution.test(arr3));
    }
}