LeetCode #566 ReshapeTheMatrix. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접,Matlab reshape
Got difficulties with how to initialize vector in vector with size which I want. Performance is not bad, memory usage is bad.
벡터 안에 벡터 원하는 사이즈로 초기화 하는 방법을 몰라서 좀 헤멤, 퍼포먼스 나쁘지 않음 메모리 나쁨
LeetCode #566
Q.
In MATLAB, there is a very useful function called 'reshape', which can reshape a matrix into a new one with different size but keep its original data.
You're given a matrix represented by a two-dimensional array, and two positive integers r and c representing the row number and column number of the wanted reshaped matrix, respectively.
The reshaped matrix need to be filled with all the elements of the original matrix in the same row-traversing order as they were.
If the 'reshape' operation with given parameters is possible and legal, output the new reshaped matrix; Otherwise, output the original matrix.
Matlab 에서, 'reshape' 라는 유용한 함수가 있는데, 원본 데이터는 유지하면서 matrix 를 다른 사이즈로 바꿔주는 것이다.
2차원 배열 매트릭스와 두개의 정수 r, c 를 입력받는데, r 과 c 는 reshape 으로 변할 matrix 의 row number 와 column number 이다.
모양이 바뀐 매트릭스는 원본 매트릭스의 모든 데이터들이 원래 있던 것 처럼 채워져 있어야 한다.
reshape 이 가능한 matrix 이면 바뀐 모양 매트릭스가 반환되고, 안되는 경우는 원본 매트릭스가 반환된다.
e.g.
Example 1:
Input:
nums =
[[1,2],
[3,4]]
r = 1, c = 4
Output:
[[1,2,3,4]]
Explanation:
The row-traversing of nums is [1,2,3,4]. The new reshaped matrix is a 1 * 4 matrix, fill it row by row by using the previous list.
Example 2:
Input:
nums =
[[1,2],
[3,4]]
r = 2, c = 4
Output:
[[1,2],
[3,4]]
Explanation:
There is no way to reshape a 2 * 2 matrix to a 2 * 4 matrix. So output the original matrix.
Note:
The height and width of the given matrix is in range [1, 100].
The given r and c are all positive.
Process
// Process
//1. Input matrix for reshape, reshape row, reshape column
//2. If it's possible condition for reshape
// 2.1. Make original matrix to 1 row matrix(vector)
// 2.2. Make reshaped matrix using 1 row matrix and input row, column
//3. Return reshaped matrix
// 처리과정
//1. reshape 할 매트릭스와, reshape 될 row / column 길이를 입력받는다.
//2. reshape 가능한 조건인지 확인해서 가능하면
// 2.1. 원본 매트릭스를 일렬로 저장해둔다.
// 2.2. 새로운 매트릭스에 입력받은 row, column 길이로 넣어준다.
//3. 새로 만든 매트릭스를 반환한다.
Code.. lemme see example code!!!
코드.. 예제코드를 보자!!!
class Solution {
public:
vector<vector<int>> matrixReshape(vector<vector<int>>& nums, int r, int c) {
vector<vector<int>> reshapedMatrix(r, vector<int>(0));
vector<int> tempVector;
if (nums.size() * nums[0].size() == r * c)
{
for (int i = 0; i < nums.size(); ++i)
for (int j = 0; j < nums[i].size(); ++j)
{
tempVector.push_back(nums[i][j]);
}
int index = 0;
for (int i = 0; i < r; ++i)
{
for (int j = 0; j < c; ++j)
{
reshapedMatrix[i].push_back(tempVector[index]);
++index;
}
}
}
else
{
reshapedMatrix = nums;
}
return reshapedMatrix;
}
};
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