nonnegative integers的用法和樣例：
例句
- The resulting value must be a nonnegative integer less than the sequence's length, and the sequence is asked to assign the assigned object to its item with that index.
最後的值必須是一個小於該序列長度的非負整數，然後該序列就被請求將被賦對象賦值給它帶那個指標的項。 - Given a cube of positive and negative integers, find the sub-cube with the largest sum.The sum of a cube is the sum of all the elements in that cube.
給出一個正整數和負整數組成的立方體，找出其中具有最大和的子立方體。
