2017/11/9 Leetcode 日记

2017/11/9 Leetcode 日记

566. Reshape the Matrix

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.

(给一个矩阵和r, c，将这个矩阵重新排列成r行c列的矩阵，如果不可能则输出原矩阵。)

 

class Solution {
public:
    vector<vector<int>> matrixReshape(vector<vector<int>>& nums, int r, int c) {
        int row = nums.size(), col = nums[0].size();
        if(row * col != r * c){
            return nums;
        }
        vector<vector<int>> num(r, vector<int>(c, 0));
        for(int i = 0;  i < row * col; i++){
            num[i/c][i%c] = nums[i/col][i%col];
        }
        return num;
    }
};

c++