Question

尝试打印已排序的字符串数组。因此，例如，如果我有一个字母从A到L的String数组，以便如何设置一个循环来获取输出。我似乎无法确定如何增加循环变量以获得正确的数字以按此顺序打印出数组。

所需的输出：

   A D G J
   B E H K 
   C F I L


String[] str = { "A", "B","C" ,"D" ,"E" ,"F" , "G" , "H" , "I" , "J" , "K", "L" };

Answer 1

为此，您仍然需要从左到右，从上到下打印。没有简单的方法可以返回到上一行并在该行继续打印。

您应该能够计算表中的行数和列数。一旦知道了这些值，就可以执行以下操作：

在列表中打印索引为0的项目。
跳过与所需行数相等的元素数（在您的示例中为3）。
打印出下一个元素（在本例中为D）。
重复步骤1-3，直到超过数组末尾为止。
打印换行符并重复上述过程，只是现在您将起始索引增加1（例如，第一次迭代从索引1开始，第二次迭代从2开始迭代等）。
一旦起始索引大于行数，就停止。

Answer 2

这是以所需格式打印的示例代码。它有两个循环-外循环打印行，内循环打印每一行的列。

  File "/home/ubuntu/.pyenv/versions/cmle-1_12-py-3_5/lib/python3.5/site-packages/tensorflow/python/client/session.py", line 1334, in _do_call
    return fn(*args)
  File "/home/ubuntu/.pyenv/versions/cmle-1_12-py-3_5/lib/python3.5/site-packages/tensorflow/python/client/session.py", line 1317, in _run_fn
    self._extend_graph()
  File "/home/ubuntu/.pyenv/versions/cmle-1_12-py-3_5/lib/python3.5/site-packages/tensorflow/python/client/session.py", line 1352, in _extend_graph
    tf_session.ExtendSession(self._session)
tensorflow.python.framework.errors_impl.InvalidArgumentError: Cannot assign a device for operation device_dummy_0/Initializer/random_uniform/RandomUniform: Could not satisfy explicit device specification '' because the node {{colocation_node device_dummy_0/Initializer/random_uniform/RandomUniform}} was colocated with a group of nodes that required incompatible device '/job:ps/task:0/device:CPU:0'
Colocation Debug Info:
Colocation group had the following types and devices: 
IsVariableInitialized: CPU 
Assign: CPU 
Identity: CPU XLA_CPU 
VariableV2: CPU  
Mul: CPU XLA_CPU 
Add: CPU XLA_CPU 
Sub: CPU XLA_CPU 
RandomUniform: CPU XLA_CPU 
Const: CPU XLA_CPU 

Colocation members and user-requested devices:
  device_dummy_0/Initializer/random_uniform/shape (Const) 
  device_dummy_0/Initializer/random_uniform/min (Const) 
  device_dummy_0/Initializer/random_uniform/max (Const) 
  device_dummy_0/Initializer/random_uniform/RandomUniform (RandomUniform) 
  device_dummy_0/Initializer/random_uniform/sub (Sub) 
  device_dummy_0/Initializer/random_uniform/mul (Mul) 
  device_dummy_0/Initializer/random_uniform (Add) 
  device_dummy_0 (VariableV2) /job:ps/task:0/device:CPU:0   
  device_dummy_0/Assign (Assign) /job:ps/task:0/device:CPU:0
  device_dummy_0/read (Identity) /job:ps/task:0/device:CPU:0
  report_uninitialized_variables/IsVariableInitialized_1 (IsVariableInitialized) /job:ps/task:0/device:CPU:0  
  report_uninitialized_variables_1/IsVariableInitialized_1 (IsVariableInitialized) /job:ps/task:0/device:CPU:0
  save/Assign_1 (Assign) /job:ps/task:0/device:CPU:0

     [[{{node device_dummy_0/Initializer/random_uniform/RandomUniform}} = RandomUniform[T=DT_INT32, _class=["loc:@device_dummy_0"], dtype=DT_FLOAT, seed=0, seed2=0](device_dummy_0/Initializer/random_uniform/shape)]]```

输出：

public class PrintArray {

    public static void main(String[] args) {
        String[] str = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L"};
        printArray(str, 3);
    }

    private static void printArray(String[] str, int numRows) {
        for (int i = 0; i < numRows; i++) {
            for (int j = 0; j < str.length; j += numRows) {
                System.out.print(str[j + i] + " ");
            }
            System.out.println();
        }
    }
}

如何按列而不是按行打印排序的列表

2 个答案: