</pre><pre name="code" class="cpp"><span style="font-size:18px;">#include<iostream>
using namespace std;
bool IsExitNum(int arr[][5], int row,int col, int num)
{
	bool find = false;
	if (arr == NULL || (row < 0 && col < 0))
	{
		return find;
	}

	int _row = 0;
	int _col = col-1;

	while (_row < row && _col >= 0)
	{
		if (arr[_row][_col] > num)
		{
			--_col;
		}
		else if (arr[_row][_col] < num)
		{
			++_row;
		}
		else
		{
			find = true;
			return find;
		}
	}
	return find;
}
//測試用例：1.9，exit；
//			2.8,no exit;
//左上角	3.0, exit;
//右下角	4.29,exit;
//左下角	5.12,exit;
int main()
{
	int arr[4][5] = { { 0, 3, 7, 9, 13 }, { 2, 5, 11, 13, 17 }, { 9, 14, 15, 19, 21 }, { 12, 18, 20, 25, 29 } };
	bool ret = IsExitNum(arr, 4, 5, 9);
	if (ret)
	{
		cout << "9 exit" << endl;
	}
	else
	{
		cout << "9 no exit" << endl;
	}
	ret = IsExitNum(arr, 4, 5, 8);
	if (ret)
	{
		cout << "8 exit" << endl;
	}
	else
	{
		cout << "8 no exit" << endl;
	}
	ret = IsExitNum(arr, 4, 5, 0);
	if (ret)
	{
		cout << "0 exit" << endl;
	}
	else
	{
		cout << "0 no exit" << endl;
	}
	ret = IsExitNum(arr, 4, 5, 29);
	if (ret)
	{
		cout << "29 exit" << endl;
	}
	else
	{
		cout << "29 no exit" << endl;
	}
	ret = IsExitNum(arr, 4, 5, 12);
	if (ret)
	{
		cout << "12 exit" << endl;
	}
	else
	{
		cout << "12 no exit" << endl;
	}
	return 0;
}</span>