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Leetcode54.cpp
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120 lines (103 loc) · 3.21 KB
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// Leetcode54.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <vector>
using namespace::std;
vector<int> spiralOrder(vector<vector<int>>& matrix)
{
int rows = matrix.size();
int cols = matrix[0].size();
int nums = rows * cols;
vector<int> spiral;
vector<vector<int>> mask;
for (int i = 0; i < rows; ++i)
mask.push_back(vector<int>(cols, 0));
int direction = 0;
int startX = 0, startY = 0;
while (spiral.size() < nums)
{
switch (direction)
{
case 0: //row,left to right
int col;
for (col = startY; col < cols; ++col)
{
if (!mask[startX][col])
{
mask[startX][col] = 1;
spiral.push_back(matrix[startX][col]);
}
else
break;
}
++startX;
startY = col - 1;
direction = 1;
break;
case 1: //col,top to bottom
int row1;
for (row1 = startX; row1 < rows; ++row1)
{
if (!mask[row1][startY])
{
mask[row1][startY] = 1;
spiral.push_back(matrix[row1][startY]);
}
else
break;
}
startX = row1 - 1;
--startY;
direction = 2;
break;
case 2: //row,right to left
int col2;
for (col2 = startY; col2 >= 0; --col2)
{
if (!mask[startX][col2])
{
mask[startX][col2] = 1;
spiral.push_back(matrix[startX][col2]);
}
else
break;
}
--startX;
startY = col2 + 1;
direction = 3;
break;
case 3: //col, bottom to up
int row3;
for (row3 = startX; row3 >= 0; --row3)
{
if (!mask[row3][startY])
{
mask[row3][startY] = 1;
spiral.push_back(matrix[row3][startY]);
}
else
break;
}
startX = row3 + 1;
++startY;
direction = 0;
break;
}
}
return spiral;
}
int main()
{
vector<vector<int>> matrix = { {1,2,3,4},{5,6,7,8},{9,10,11,12} };
vector<int> spiral = spiralOrder(matrix);
std::cout << "Hello World!\n";
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file