# 以逆時針螺旋形式打印給定矩陣 > 原文： [https://www.geeksforgeeks.org/print-given-matrix-counter-clock-wise-spiral-form/](https://www.geeksforgeeks.org/print-given-matrix-counter-clock-wise-spiral-form/) 給定 2D 數組，以逆時針螺旋形式打印。 請參閱以下示例。 **示例**： ``` Input: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Output: 1 5 9 13 14 15 16 12 8 4 3 2 6 10 11 7 Input: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Output: 1 7 13 14 15 16 17 18 12 6 5 4 3 2 8 9 10 11 ``` **說明**：  下面是實現： ## C++ ```cpp // C++ implementation to print // the counter clock wise // spiral traversal of matrix #include <bits/stdc++.h> using namespace std; #define R 4 #define C 4 // function to print the // required traversal void counterClockspiralPrint(int m,? ?????????????????????????????int n,? ?????????????????????????????int arr[R][C]) { ????int i, k = 0, l = 0; ????//? k - starting row index ????//??? m - ending row index ????//??? l - starting column index ????//??? n - ending column index ????//??? i - iterator? ????// initialize the count ????int cnt = 0; ????// total number of? ????// elements in matrix ????int total = m * n; ????while (k < m && l < n)? ????{ ????????if (cnt == total) ????????????break; ????????// Print the first column? ????????// from the remaining columns ????????for (i = k; i < m; ++i) ????????{ ????????????cout << arr[i][l] << " "; ????????????cnt++; ????????} ????????l++; ????????if (cnt == total) ????????????break; ????????// Print the last row from ????????// the remaining rows? ????????for (i = l; i < n; ++i)? ????????{ ????????????cout << arr[m - 1][i] << " "; ????????????cnt++; ????????} ????????m--; ????????if (cnt == total) ????????????break; ????????// Print the last column? ????????// from the remaining columns? ????????if (k < m)? ????????{ ????????????for (i = m - 1; i >= k; --i)? ????????????{ ????????????????cout << arr[i][n - 1] << " "; ????????????????cnt++; ????????????} ????????????n--; ????????} ????????if (cnt == total) ????????????break; ????????// Print the first row? ????????// from the remaining rows? ????????if (l < n)? ????????{ ????????????for (i = n - 1; i >= l; --i)? ????????????{ ????????????????cout << arr[k][i] << " "; ????????????????cnt++; ????????????} ????????????k++; ????????} ????} } // Driver Code int main() { ????int arr[R][C] = {{ 1, 2, 3, 4 }, ?????????????????????{ 5, 6, 7, 8 }, ?????????????????????{ 9, 10, 11, 12 }, ?????????????????????{ 13, 14, 15, 16 }}; ????counterClockspiralPrint(R, C, arr); ????return 0; } ```